1 00:00:00,000 --> 00:00:08,070 2 00:00:08,070 --> 00:00:10,430 >> R.J. Aquino: Hebu tu kuanza. 3 00:00:10,430 --> 00:00:12,310 Hivyo hii ni Quiz 1. 4 00:00:12,310 --> 00:00:14,890 Hapa ni baadhi ya habari ngazi ya juu. 5 00:00:14,890 --> 00:00:19,915 Kuhusu ukurasa kwa jaribio ni wakati huu URL, tena CS50.net, pamoja na kwamba 6 00:00:19,915 --> 00:00:21,080 bado kazi. 7 00:00:21,080 --> 00:00:26,920 Ni CS50.harvard.edu/quizzes/2013/1. 8 00:00:26,920 --> 00:00:31,070 Ni kubwa Kuhusu ukurasa, nawaambia wapi na wakati, yaani Jumatano ijayo 9 00:00:31,070 --> 00:00:32,100 katika kundi la vyumba. 10 00:00:32,100 --> 00:00:36,120 Na kwa Jumatano ijayo, mimi maana siku mbili kuanzia sasa. 11 00:00:36,120 --> 00:00:37,890 Habari hii yote ni huko. 12 00:00:37,890 --> 00:00:39,110 Lakini ni nyongeza. 13 00:00:39,110 --> 00:00:43,790 >> Kwa hiyo kila kitu kutoka nusu ya kwanza ya mwaka ni uwezekano wa juu ya jaribio, 14 00:00:43,790 --> 00:00:50,780 kwa sababu unaweza si kweli kufanya juu mambo katika C bila kama hali na 15 00:00:50,780 --> 00:00:51,920 kwa loops na kadhalika. 16 00:00:51,920 --> 00:00:55,580 Lakini kutakuwa na msisitizo juu ya vifaa kufunikwa tangu Quiz 0, 17 00:00:55,580 --> 00:00:59,570 kuanzia na structs na Picha I / O. Ni kawaida zaidi 18 00:00:59,570 --> 00:01:01,620 changamoto kuliko Quiz 0. 19 00:01:01,620 --> 00:01:03,870 alama ya wastani ni kawaida ya chini. 20 00:01:03,870 --> 00:01:05,980 Kusoma kwa bidii. 21 00:01:05,980 --> 00:01:09,340 >> Wakati wewe ni kusoma, kuwa na uhakika wa kutumia CS50/discuss baada ya maswali yako 22 00:01:09,340 --> 00:01:10,830 na kusoma maswali ya watu wengine. 23 00:01:10,830 --> 00:01:13,550 Hivyo kama huna maswali yoyote, kuingia katika na kusoma 24 00:01:13,550 --> 00:01:14,580 maswali rafiki yako. 25 00:01:14,580 --> 00:01:16,560 Wao ni pengine maswali mazuri. 26 00:01:16,560 --> 00:01:17,730 Na kuchukua Quizzes mazoezi. 27 00:01:17,730 --> 00:01:20,750 Tumekuwa kutoa Quizzes kwa saba au miaka minane sasa. 28 00:01:20,750 --> 00:01:22,180 Wao ni wote online. 29 00:01:22,180 --> 00:01:25,540 Maswali baadaye ni sawa kwa maswali ya zamani. 30 00:01:25,540 --> 00:01:26,550 Hiyo ni jinsi sisi kufanya nao. 31 00:01:26,550 --> 00:01:27,740 >> Jaribio haipo bado. 32 00:01:27,740 --> 00:01:28,670 Hakuna hata mmoja wetu tumeona. 33 00:01:28,670 --> 00:01:32,496 Lakini itakuwa kuangalia kama uliopita Quizzes. 34 00:01:32,496 --> 00:01:36,500 Kwa ajili ya kikao tathmini hii, hii si orodha kamili ya mada. 35 00:01:36,500 --> 00:01:40,740 Huwezi kuhudhuria hii na kisha kikamilifu tayari kwa jaribio. 36 00:01:40,740 --> 00:01:43,330 Vinginevyo, itakuwa ni kwamba sehemu kubwa ya jaribio. 37 00:01:43,330 --> 00:01:46,270 Na hii pia ni si lazima kila kitu unahitaji kujua kuhusu yoyote 38 00:01:46,270 --> 00:01:46,970 kutokana na mada. 39 00:01:46,970 --> 00:01:50,520 Ni maana ya nje wewe mambo tumekuwa kufunikwa, kuwakumbusha nini sisi 40 00:01:50,520 --> 00:01:53,070 kufunikwa, na njia ambayo sisi kufunikwa. 41 00:01:53,070 --> 00:01:57,030 Lakini utakuwa na kwenda mbali zaidi na zaidi wakati kujifunza kwa mara mbili-check 42 00:01:57,030 --> 00:02:00,230 kwamba unajua kila kitu kuhusu wowote mada na kwamba umefanya kujazwa katika 43 00:02:00,230 --> 00:02:03,320 pembe wote waliokuwa kufunikwa katika hotuba. 44 00:02:03,320 --> 00:02:07,980 >> maelezo jaribio kukuambia kwenda kwa maelezo, mwandishi, kuangalia hotuba video. 45 00:02:07,980 --> 00:02:10,155 Hiyo ndiyo njia nzuri ya kuhakikisha wameweza kufunikwa besi yako yote. 46 00:02:10,155 --> 00:02:12,670 47 00:02:12,670 --> 00:02:17,340 Hivyo kupata kuanza, wakati mimi alifanya haya slides, mimi alijaribu kuweka ambapo nimeona 48 00:02:17,340 --> 00:02:18,350 habari. 49 00:02:18,350 --> 00:02:22,890 Hivyo kwa File I / O, kwa mfano, Wiki 7, Jumatatu hotuba, na posted 50 00:02:22,890 --> 00:02:27,960 Sehemu ya 6 na kuweka tatizo wote wana taarifa kuhusu File I / O. Nimekuwa kufanyika 51 00:02:27,960 --> 00:02:28,840 hii kwa kila mada. 52 00:02:28,840 --> 00:02:33,010 Hivyo slides wale cheo inaweza kuwa na manufaa na wewe. 53 00:02:33,010 --> 00:02:38,950 >> Kwa hiyo hapa tuna File I / O. Kumbuka, katika Tatizo Kuweka 5, tulikuwa fopen, fclose, 54 00:02:38,950 --> 00:02:41,210 fwrite, fread, na fseek. 55 00:02:41,210 --> 00:02:48,090 Baada ya zinalipwa 30ish JPEGs na kuwa resized na messed na 56 00:02:48,090 --> 00:02:50,320 bitmaps, unapaswa kuwa na pretty ukoo kwa kazi hizi 57 00:02:50,320 --> 00:02:51,830 na jinsi kazi. 58 00:02:51,830 --> 00:02:54,420 Kama wewe ni tena utambuzi, dhahiri tathmini yao. 59 00:02:54,420 --> 00:02:56,860 Na kuhakikisha kuelewa nini hoja mbalimbali ni, 60 00:02:56,860 --> 00:02:58,260 wakati wao ni kutumika. 61 00:02:58,260 --> 00:03:03,620 >> Lakini kawaida mende file-kuhusiana unaweza kuulizwa kuhusu - 62 00:03:03,620 --> 00:03:07,270 vizuri, kama tumesahau kuangalia kama fopen kweli kazi kabla ya kwenda 63 00:03:07,270 --> 00:03:08,350 kurekebisha faili. 64 00:03:08,350 --> 00:03:09,760 Hiyo inaweza kuwa mbaya. 65 00:03:09,760 --> 00:03:13,560 Kama umefanya wamesahau fclose file kwamba umefanya fopened, hiyo ni sawa na 66 00:03:13,560 --> 00:03:14,400 kumbukumbu leak. 67 00:03:14,400 --> 00:03:15,980 Hiyo ni pretty mbaya. 68 00:03:15,980 --> 00:03:18,670 Na kusahau kuangalia kama wameweza kufikiwa mwisho wa file kabla ya 69 00:03:18,670 --> 00:03:19,790 kuanza kuandika hiyo. 70 00:03:19,790 --> 00:03:22,320 >> Hivyo kama wewe kusema, hey, mimi nina katika mwisho wa faili. 71 00:03:22,320 --> 00:03:23,750 Nipe 5 ka zaidi. 72 00:03:23,750 --> 00:03:27,370 Naam, kwamba pengine si kwenda kazi nje ya njia wewe kutarajia. 73 00:03:27,370 --> 00:03:30,930 Hiyo ni kweli ni kwa File I / O, kwa sababu sisi alifanya hivyo sehemu kubwa ya 74 00:03:30,930 --> 00:03:32,300 na kuweka tatizo. 75 00:03:32,300 --> 00:03:36,000 Hivyo kama wewe kuelewa nini kinachoendelea katika kuweka tatizo 5, kumbuka bitmats 76 00:03:36,000 --> 00:03:40,090 na JPEGs, basi wewe ni pengine wote kuweka kwa File I / O. Kama hiyo ni kidogo 77 00:03:40,090 --> 00:03:44,770 fuzzy, dhahiri kupitia tatizo kwamba kuweka na vifaa kuhusishwa. 78 00:03:44,770 --> 00:03:51,110 >> Structs walikuwa mada waliokuwa juu ya line kati ya Quiz 0 na Quiz 1. 79 00:03:51,110 --> 00:03:53,090 Je, si kabisa kufanya kata kwa Quiz 0. 80 00:03:53,090 --> 00:03:57,040 Basi utakuwa dhahiri kuwa juu ya Quiz 1, Wiki 7, Jumatatu. 81 00:03:57,040 --> 00:03:58,150 Ni struct nini? 82 00:03:58,150 --> 00:04:00,250 Hapa sisi kuonyesha struct. 83 00:04:00,250 --> 00:04:03,140 Ni kama aina mpya. 84 00:04:03,140 --> 00:04:07,940 Ni kama chombo kwa ajili ya mashamba nyingi. 85 00:04:07,940 --> 00:04:12,970 >> Katika kesi hiyo, tumekuwa alitangaza struct mwanafunzi ambayo ina mashamba mawili - 86 00:04:12,970 --> 00:04:17,750 kamba kwamba sisi ni wito jina na int kwamba sisi ni wito umri. 87 00:04:17,750 --> 00:04:21,450 Hivyo wakati mimi kupita kote wanafunzi au mimi kurekebisha wanafunzi, mimi utakuwa na uwezo wa 88 00:04:21,450 --> 00:04:24,430 kupata majina yao na umri wao. 89 00:04:24,430 --> 00:04:26,670 Hebu tuangalie baadhi ya kanuni kwa ajili hiyo. 90 00:04:26,670 --> 00:04:29,090 Hapa tunaona kwamba nimepata alitangaza mwanafunzi s, kama 91 00:04:29,090 --> 00:04:30,300 Mimi kutangaza variable yoyote - 92 00:04:30,300 --> 00:04:32,430 int x, y int, nakadhalika. 93 00:04:32,430 --> 00:04:34,180 >> Hapa ni mwanafunzi s. 94 00:04:34,180 --> 00:04:37,370 Yeye kuanza na kitu katika mashamba yake. 95 00:04:37,370 --> 00:04:38,240 Basi hebu kuweka yao. 96 00:04:38,240 --> 00:04:40,681 Kuweka mashamba ya struct na dot. 97 00:04:40,681 --> 00:04:43,780 Hivyo nimekuwa alisema hapa kwamba s.name = RJ. 98 00:04:43,780 --> 00:04:46,470 Na s.age = 21. 99 00:04:46,470 --> 00:04:48,500 Unaweza pia update mashamba njia hiyo utaweza kuboresha 100 00:04:48,500 --> 00:04:49,550 thamani ya kutofautiana. 101 00:04:49,550 --> 00:04:53,270 Hivyo nataka kubadili jina langu kutoka RJ na hakuna vipindi kwa R.J. yameandikwa 102 00:04:53,270 --> 00:04:54,540 njia sahihi. 103 00:04:54,540 --> 00:04:58,890 Itakuwa s.name = RJ, sawa kama sisi alisema awali. 104 00:04:58,890 --> 00:05:00,030 Na kisha unaweza kuzipata. 105 00:05:00,030 --> 00:05:00,930 >> Hivyo tumekuwa kuweka yao. 106 00:05:00,930 --> 00:05:01,840 Tumekuwa updated yao. 107 00:05:01,840 --> 00:05:03,890 Unaweza pia kupata yao katika njia hiyo hiyo. 108 00:05:03,890 --> 00:05:09,330 Hivyo hapa, mimi nina uchapishaji nje R.J. Ni umri wa miaka 21. 109 00:05:09,330 --> 00:05:14,700 Na mimi nina kupata maadili hayo na s.name na s.age. 110 00:05:14,700 --> 00:05:17,040 Hivyo hiyo kupata structs na dot nukuu. 111 00:05:17,040 --> 00:05:17,850 Yep, swali? 112 00:05:17,850 --> 00:05:21,176 >> Watazamaji: Je, kuna sababu juu ya slide uliopita kwamba hakuwa na kuweka 113 00:05:21,176 --> 00:05:24,848 mwanafunzi wa line ya juu, kama typedef struct mwanafunzi na kisha 114 00:05:24,848 --> 00:05:25,840 mwanafunzi mwishoni? 115 00:05:25,840 --> 00:05:29,040 >> R.J. Aquino: Kwa hiyo swali lilikuwa, juu ya slide hii, tumekuwa kawaida kuonekana 116 00:05:29,040 --> 00:05:32,400 typedef struct node na kisha mashamba ya struct na 117 00:05:32,400 --> 00:05:34,250 kisha neno nodi. 118 00:05:34,250 --> 00:05:37,790 Na jinsi ya kuja hapa mimi hakusema, typedef struct mwanafunzi na kisha 119 00:05:37,790 --> 00:05:39,820 mashamba ya struct na kisha mwanafunzi? 120 00:05:39,820 --> 00:05:44,310 Sababu ni kwamba mimi hawana haja ya kupata hiyo ndani ya struct. 121 00:05:44,310 --> 00:05:46,270 Hivyo ni sawa na kuondoka bila jina. 122 00:05:46,270 --> 00:05:49,210 Siwezi kuondoka tu kama bila majina struct. 123 00:05:49,210 --> 00:05:53,130 >> sababu sisi kufanya hivyo kwa orodha wanaohusishwa na mambo ni kwa sababu ndani unahitaji 124 00:05:53,130 --> 00:05:55,360 rejea struct nodes nyota. 125 00:05:55,360 --> 00:05:58,220 Hivyo struct ina kuwa na jina, hivyo unaweza kupata baadaye. 126 00:05:58,220 --> 00:05:59,540 Ni undani madogo. 127 00:05:59,540 --> 00:06:04,750 Lakini utasikia kawaida kuona typedef struct braces curly kama huna haja ya 128 00:06:04,750 --> 00:06:08,720 jina na typedef struct baadhi jina ikifuatiwa na braces curly kama wewe 129 00:06:08,720 --> 00:06:09,520 haja jina. 130 00:06:09,520 --> 00:06:12,070 Hivyo kwamba ni swali zuri. 131 00:06:12,070 --> 00:06:17,000 >> Na juu ya hatua hiyo, sisi huwa na kurekebisha structs na kupita kote structs na 132 00:06:17,000 --> 00:06:18,680 rejea, si kwa thamani. 133 00:06:18,680 --> 00:06:21,940 Hivyo tutaweza tu kupita kote kuyatumia kwa structs badala ya kupita karibu na 134 00:06:21,940 --> 00:06:23,150 structs wenyewe. 135 00:06:23,150 --> 00:06:28,050 Hivyo wewe ni mara nyingi sana kwenda kuwa kutumia, katika kesi hii, mwanafunzi * au 136 00:06:28,050 --> 00:06:34,150 * node struct au nodi * badala nje ya wanafunzi au nodes. 137 00:06:34,150 --> 00:06:39,350 Hivyo hapa, nimekuwa alisema, OK, variable PTR ni kwenda kuwa pepe ya s. 138 00:06:39,350 --> 00:06:45,570 Ni kwenda kuwa pointer kwa mwanafunzi R.J. 139 00:06:45,570 --> 00:06:48,965 >> Ili tuweze kupata katika mashamba hayo sawa na sisi kupata kitu chochote. 140 00:06:48,965 --> 00:06:51,460 Kwanza, ID kumbukumbu pointer kupata struct. 141 00:06:51,460 --> 00:06:55,530 Hiyo ni * PTR na kisha dot na kisha umri. 142 00:06:55,530 --> 00:06:58,790 Hivyo kupata shamba, na nimekuwa updated sasa 22, kwa sababu, hebu 143 00:06:58,790 --> 00:07:00,860 kusema, ilikuwa ni siku ya kuzaliwa yangu. 144 00:07:00,860 --> 00:07:03,990 Kuna syntax njia ya mkato kutumia mshale hapa. 145 00:07:03,990 --> 00:07:07,060 Hivyo PTR arrow umri ni sawa na * ptr.age. 146 00:07:07,060 --> 00:07:10,150 147 00:07:10,150 --> 00:07:11,550 Sasa, hiyo ni kitu itabidi kukariri na kukumbuka. 148 00:07:11,550 --> 00:07:15,010 >> Unaweza kutumika ni mengi katika pset6, Speller pset. 149 00:07:15,010 --> 00:07:18,350 Lakini hii ni kweli nini kinaendelea juu ya chini ya Hood. 150 00:07:18,350 --> 00:07:20,500 Ni dereferencing pointer na kisha kupata huduma hiyo. 151 00:07:20,500 --> 00:07:21,432 Swali? 152 00:07:21,432 --> 00:07:22,682 >> Watazamaji: [inaudible]. 153 00:07:22,682 --> 00:07:25,860 154 00:07:25,860 --> 00:07:28,060 >> R.J. Aquino: Basi kwa nini ni sisi kutumia kuyatumia kama structs badala ya 155 00:07:28,060 --> 00:07:29,500 structs wenyewe? 156 00:07:29,500 --> 00:07:33,740 sababu itakuwa kama wewe ni kupita struct kazi, pengine 157 00:07:33,740 --> 00:07:36,900 unataka kupita karibu tu 4 au hivyo ka kwamba kuwakilisha pointer, kama 158 00:07:36,900 --> 00:07:40,375 kinyume na uwezekano wa 30 au Ka 40 ambayo ni struct. 159 00:07:40,375 --> 00:07:44,410 Hivyo kupita kitu kazi ni rahisi zaidi wakati kitu 160 00:07:44,410 --> 00:07:48,230 ni ndogo katika muda mfupi. 161 00:07:48,230 --> 00:07:49,074 Swali? 162 00:07:49,074 --> 00:07:53,026 >> Watazamaji: Unaweza kuwa zilizotajwa hii katika mwanzo, lakini kuna 163 00:07:53,026 --> 00:07:56,000 slides nyingine juu ya [inaudible]? 164 00:07:56,000 --> 00:07:58,960 >> R.J. Aquino: slides hawa watakuwa baada ya mapitio kikao. 165 00:07:58,960 --> 00:08:00,210 Tutaweza baada yao kwenye tovuti. 166 00:08:00,210 --> 00:08:02,450 167 00:08:02,450 --> 00:08:06,870 Hivyo kuhama na kuhamia kwenye kidogo kasi, sisi ni kwenda kuzungumza kuhusu data 168 00:08:06,870 --> 00:08:07,350 miundo. 169 00:08:07,350 --> 00:08:08,040 Kuna mengi. 170 00:08:08,040 --> 00:08:10,080 Sisi kufunikwa rundo la yao. 171 00:08:10,080 --> 00:08:12,500 Hapa ni nini wanapaswa kuelewa juu ya muundo wa data. 172 00:08:12,500 --> 00:08:15,590 >> Lazima kweli kuelewa wakati high ngazi nini kila muundo ni. 173 00:08:15,590 --> 00:08:21,190 Je, unaweza kuelezea kwa Kiingereza yako rafiki kwamba hana CS50 jinsi 174 00:08:21,190 --> 00:08:25,580 sisi ni kuandaa data zetu na kwa nini tunatarajia kutumia kitu kwa njia hii? 175 00:08:25,580 --> 00:08:26,990 Hilo ni jambo moja. 176 00:08:26,990 --> 00:08:29,650 Kitu mbili, kuelewa utekelezaji. 177 00:08:29,650 --> 00:08:34,270 Hivyo kuelewa jinsi ya kutumia mambo haya katika C. Na tutaweza kwenda juu ya hili. 178 00:08:34,270 --> 00:08:39,030 >> Na kisha kitu tatu itakuwa kujua mara kukimbia na mapungufu ya 179 00:08:39,030 --> 00:08:40,470 miundo mbalimbali unatumia. 180 00:08:40,470 --> 00:08:44,059 Hivyo kuelewa ni kwa nini ungependa kutumia hash meza badala ya safu. 181 00:08:44,059 --> 00:08:49,570 Kuelewa jinsi ya kufunga, kwa wastani, kupata meza hash ni. 182 00:08:49,570 --> 00:08:54,010 Kuelewa nini shughuli ni ya kufunga juu ya orodha wanaohusishwa lakini polepole juu ya arrays na 183 00:08:54,010 --> 00:08:56,080 kinyume chake. 184 00:08:56,080 --> 00:08:59,780 Hivyo kuelewa kwamba, itabidi kuelewa Big-O nukuu tu kujua 185 00:08:59,780 --> 00:09:01,310 jinsi ya kuzungumza juu ya haya aina ya mambo. 186 00:09:01,310 --> 00:09:02,700 Na tutaweza kuzungumzia suala hilo. 187 00:09:02,700 --> 00:09:06,040 >> Kitu hivyo kwanza, wanaohusishwa orodha. 188 00:09:06,040 --> 00:09:07,770 Hapa ni kiwango cha juu cha picha orodha ya uhusiano. 189 00:09:07,770 --> 00:09:08,830 Sisi kuonyesha hili darasani. 190 00:09:08,830 --> 00:09:11,670 Sisi kawaida na watu 10 amesimama juu ya hatua. 191 00:09:11,670 --> 00:09:16,790 Lakini sisi kuwa na mlolongo wa nodes ambapo kila node ina baadhi ya thamani na pointer 192 00:09:16,790 --> 00:09:18,610 kwa thamani yake ya pili. 193 00:09:18,610 --> 00:09:21,730 Hivyo kupata kutoka node moja kwa ya pili, kusema tu, nipe node ijayo. 194 00:09:21,730 --> 00:09:22,530 Una kwamba nodi. 195 00:09:22,530 --> 00:09:23,770 Nipe node ijayo. 196 00:09:23,770 --> 00:09:24,400 Una kwamba nodi. 197 00:09:24,400 --> 00:09:28,790 Nipe node ya pili na kadhalika mpaka hakuna kushoto nodi. 198 00:09:28,790 --> 00:09:31,850 >> Hivyo kuendelea kuzungumzia kuhusu katika ngazi ya juu. 199 00:09:31,850 --> 00:09:34,100 Ni rahisi sana kwa kuingiza mambo katika orodha wanaohusishwa. 200 00:09:34,100 --> 00:09:36,010 Kama huna huduma ya juu ili, unaweza tu kushuka 201 00:09:36,010 --> 00:09:36,840 haki katika mwanzo. 202 00:09:36,840 --> 00:09:38,520 Hiyo ni mara ya mara kwa mara. 203 00:09:38,520 --> 00:09:39,900 Lakini ni vigumu kupata thamani. 204 00:09:39,900 --> 00:09:43,060 Kama wewe ni kujaribu kuuliza, ni saba katika orodha yangu? 205 00:09:43,060 --> 00:09:44,740 Una kwenda kwa njia ya kila thamani moja. 206 00:09:44,740 --> 00:09:45,680 Je, hii ni saba? 207 00:09:45,680 --> 00:09:46,610 Je, hii ni saba? 208 00:09:46,610 --> 00:09:47,770 Je, hii ni saba? 209 00:09:47,770 --> 00:09:48,690 Je, hii ni saba? 210 00:09:48,690 --> 00:09:49,830 Tena na tena. 211 00:09:49,830 --> 00:09:51,520 Na kwamba O (n). 212 00:09:51,520 --> 00:09:53,800 Hivyo wakati kusoma kwa jaribio, kulinganisha na arrays. 213 00:09:53,800 --> 00:09:57,010 214 00:09:57,010 --> 00:09:58,220 >> Ni kwamba OK? 215 00:09:58,220 --> 00:09:59,220 taa akaenda dim. 216 00:09:59,220 --> 00:10:01,110 OK. 217 00:10:01,110 --> 00:10:02,400 Wakati ni orodha wanaohusishwa bora? 218 00:10:02,400 --> 00:10:04,640 Wakati ni safu bora? 219 00:10:04,640 --> 00:10:06,670 Hivyo basi tuangalie baadhi ya kanuni. 220 00:10:06,670 --> 00:10:08,960 Hapa ni node uwezo. 221 00:10:08,960 --> 00:10:09,770 Ni struct. 222 00:10:09,770 --> 00:10:12,220 Ina int n, ambayo itakuwa thamani yetu. 223 00:10:12,220 --> 00:10:17,780 Na ina struct nodi * ya pili, ambayo ni pointer yetu node ijayo. 224 00:10:17,780 --> 00:10:23,040 Hivyo hapa, tunaweza kuona kwamba sisi kilichotokea kuwa na kuweka int katika node yetu. 225 00:10:23,040 --> 00:10:27,850 Lakini kama hii walikuwa orodha wanaohusishwa ya char nyota au orodha wanaohusishwa ya ikifungwa, sisi 226 00:10:27,850 --> 00:10:28,820 kabisa inaweza kufanya hivyo pia. 227 00:10:28,820 --> 00:10:33,110 >> Kumbuka katika pset6, pengine alikuwa wanaohusishwa orodha ya nyota char au tu 228 00:10:33,110 --> 00:10:34,360 tuli char arrays. 229 00:10:34,360 --> 00:10:37,370 230 00:10:37,370 --> 00:10:39,040 Hebu tuangalie hapa katika utendaji. 231 00:10:39,040 --> 00:10:43,570 Hivyo tunataka kuingiza mpya n katika orodha yetu wanaohusishwa. 232 00:10:43,570 --> 00:10:48,940 Sisi kuanza nje na kichwa pointer kwamba ni pointer kwa node hii ambayo ina 233 00:10:48,940 --> 00:10:53,460 thamani ya n na ya pili ya pointer kwamba pointi node hii ni thamani ya 234 00:10:53,460 --> 00:10:57,760 n na ya pili ya null, kwa sababu ni node mwisho. 235 00:10:57,760 --> 00:11:00,440 Hivyo kwa maslahi ya wakati, mimi kuweka code yote juu ya screen. 236 00:11:00,440 --> 00:11:03,130 Na tutaweza kutembea kwa njia yake mistari michache wakati huo. 237 00:11:03,130 --> 00:11:05,790 >> Hivyo hapa ni code. 238 00:11:05,790 --> 00:11:07,560 Natumaini ni someka. 239 00:11:07,560 --> 00:11:11,275 Jambo la kwanza sisi kufanya ni sisi malloc node mpya. 240 00:11:11,275 --> 00:11:15,105 Hivyo inafanya pointer kwa node mpya ambayo haina kabisa kuwa na kitu chochote kuweka 241 00:11:15,105 --> 00:11:16,450 ndani yake bado. 242 00:11:16,450 --> 00:11:19,580 Sisi kuangalia kuhakikisha kwamba node mpya siyo null. 243 00:11:19,580 --> 00:11:22,220 Vinginevyo, sisi na kutoa up. 244 00:11:22,220 --> 00:11:27,680 Hivyo kuwa checked kwamba, sisi sasa kuweka maadili katika node. 245 00:11:27,680 --> 00:11:31,520 Hivyo sisi kuweka n mpya katika n uwanja wetu. 246 00:11:31,520 --> 00:11:36,050 Na sisi kuweka pointer ijayo kwa uhakika na kichwa ya awali, hivyo kwamba tunaweza 247 00:11:36,050 --> 00:11:38,900 sasa kuwa kuingizwa hii nodi katika orodha yetu. 248 00:11:38,900 --> 00:11:44,600 >> Hatimaye, tuna kimataifa kichwa hatua nodi wetu mpya, ili kama tulikuwa 249 00:11:44,600 --> 00:11:50,300 kuanza saa kichwa, tunataka kuwa wakati huu node mpya ya kwanza badala ya 250 00:11:50,300 --> 00:11:51,560 zamani kwanza kwenye vituo maalum. 251 00:11:51,560 --> 00:11:55,320 Na wakati kazi hii exits, variable mpya wa nodi unafanya haipo tena, 252 00:11:55,320 --> 00:11:57,130 kwa sababu ilikuwa mitaa kufanya kazi. 253 00:11:57,130 --> 00:11:59,770 Hivyo hii ni hali ya dunia. 254 00:11:59,770 --> 00:12:03,570 Kichwa wetu wa kimataifa anazungumzia wetu mpya node kwanza, ambayo pointi wetu 255 00:12:03,570 --> 00:12:06,346 node ya awali kwanza, ambayo pointi nodi baada ya hapo. 256 00:12:06,346 --> 00:12:09,790 >> Hiyo ilikuwa ni kuingizwa. 257 00:12:09,790 --> 00:12:12,150 Natumaini kwamba ulikuwa na moja kwa moja kwa kufuata. 258 00:12:12,150 --> 00:12:14,300 Wakati katika shaka, kuchora picha. 259 00:12:14,300 --> 00:12:17,820 Basi, mimi kujua kwamba kuzungumza juu ya orodha ya wanaohusishwa na kuangalia 260 00:12:17,820 --> 00:12:19,870 code ni sana si kusaidia. 261 00:12:19,870 --> 00:12:23,790 Wakati kuangalia picha ya wanaohusishwa orodha inaruhusu mimi nadhani, oh, hivyo 262 00:12:23,790 --> 00:12:24,970 Mimi na node hii hapa. 263 00:12:24,970 --> 00:12:28,980 Lakini kama mimi update kwamba pointer, mwisho juu disconnected. 264 00:12:28,980 --> 00:12:34,340 Na mimi tumesahau ambapo node unaendelea. 265 00:12:34,340 --> 00:12:35,390 Na kanuni exits. 266 00:12:35,390 --> 00:12:37,830 Na una nodes nyingi kwamba ni kukatika. 267 00:12:37,830 --> 00:12:39,970 Na huna kuishia na orodha unataka. 268 00:12:39,970 --> 00:12:43,320 >> Hivyo kama wewe kuchora picha na kufanya hivyo hatua kwa hatua, hopefully, utaona 269 00:12:43,320 --> 00:12:46,840 mpangilio sahihi ya mambo katika suala la kuhuisha kuyatumia ili kuhakikisha 270 00:12:46,840 --> 00:12:48,830 kwamba orodha huja pamoja. 271 00:12:48,830 --> 00:12:51,240 Insert ni rahisi. 272 00:12:51,240 --> 00:12:55,210 moja ngumu zaidi itakuwa kuingizwa katika orodha Iliyopangwa. 273 00:12:55,210 --> 00:12:59,980 kazi ngumu zaidi ni kufuta na kupata, hivyo kutafuta njia ya orodha ya 274 00:12:59,980 --> 00:13:03,030 kuona kama kitu ni huko. 275 00:13:03,030 --> 00:13:07,220 Labda alifanya hii katika pset6 wakati got katika hash meza yako na wewe alisema, 276 00:13:07,220 --> 00:13:10,460 vizuri, ni neno apple katika orodha yangu wanaohusishwa? 277 00:13:10,460 --> 00:13:11,440 >> Hivyo unaweza kuwa tayari aliyefanya hivyo. 278 00:13:11,440 --> 00:13:15,530 Lakini dhahiri, mahitaji kumbukumbu yako na kujaribu reimplement kupata na 279 00:13:15,530 --> 00:13:19,150 reimplement kufuta kwa orodha wanaohusishwa. 280 00:13:19,150 --> 00:13:22,850 Furaha upande note, kuna pia doubly-wanaohusishwa orodha, ambapo una 281 00:13:22,850 --> 00:13:27,490 kuyatumia kwamba uhakika wote mbele na nyuma, ili kwamba unaweza kwenda 282 00:13:27,490 --> 00:13:29,270 node ujao na node uliopita. 283 00:13:29,270 --> 00:13:33,860 Basi, kulikuwa na swali juu ya mwaka jana Jaribio wa aina hiyo, kuzungumza 284 00:13:33,860 --> 00:13:36,190 kuhusu doubly-wanaohusishwa orodha. 285 00:13:36,190 --> 00:13:40,070 >> Sasa, hiyo ni muundo kwamba wewe ni kiasi ukoo na, kwa sababu wengi 286 00:13:40,070 --> 00:13:42,520 ya pengine kutumika yao juu ya pset6. 287 00:13:42,520 --> 00:13:45,680 Hapa ni moja hiyo ni kidogo chini ya ukoo. 288 00:13:45,680 --> 00:13:51,020 Kama upande note, nadhani kwamba Quiz 1 ni kimsingi ngumu kuliko Quiz 0, kwa sababu 289 00:13:51,020 --> 00:13:54,600 mambo wewe ni kufanya, unaweza hawajafanya kama sana. 290 00:13:54,600 --> 00:13:58,100 Kuweka kwamba njia nyingine, kwa Quiz 0, ungeandika mengi ya C. Na sisi 291 00:13:58,100 --> 00:13:58,880 aliuliza juu ya C. 292 00:13:58,880 --> 00:14:02,310 >> Kwa Quiz 1, tunakwenda kuuliza kuhusu PHP na JavaScript, ambayo 293 00:14:02,310 --> 00:14:03,490 si imeandikwa kama mengi ya. 294 00:14:03,490 --> 00:14:07,590 Tunakwenda kuuliza kuhusu C-kificho kwamba wewe si imeandikwa kama mengi ya, 295 00:14:07,590 --> 00:14:09,130 hii C mambo ya juu. 296 00:14:09,130 --> 00:14:11,520 Hivyo dhahiri, mazoezi mambo sisi kuongelea katika hotuba kwamba 297 00:14:11,520 --> 00:14:15,260 haikuwa lazima kufanya juu ya kuweka tatizo. 298 00:14:15,260 --> 00:14:17,870 >> Akizungumza ambayo, wewe si imeandikwa stack juu ya kuweka tatizo. 299 00:14:17,870 --> 00:14:19,610 Lakini ilikuwa katika hotuba. 300 00:14:19,610 --> 00:14:22,530 Hapa ni kiwango cha juu cha picha ya mwingi kwamba sisi kuonyesha kila mwaka. 301 00:14:22,530 --> 00:14:26,180 Ni mkusanyiko wa trays katika Mather dining hall. 302 00:14:26,180 --> 00:14:30,570 Katika ngazi ya juu, mwingi ni mwisho katika, kwanza nje ya muundo data. 303 00:14:30,570 --> 00:14:32,040 Hiyo ina maana utaenda kuweka mambo katika - 304 00:14:32,040 --> 00:14:36,400 1, 3, 7, 12, 14, hasi 0. 305 00:14:36,400 --> 00:14:39,180 jambo moja sikuweza na alisema - hasi 3, 0. 306 00:14:39,180 --> 00:14:40,250 Kuweka mambo hayo yote in 307 00:14:40,250 --> 00:14:42,940 Na moja ya mwisho ya kuweka katika ni mara ya kwanza moja ambayo inaenda kutoka nje. 308 00:14:42,940 --> 00:14:44,170 >> Hivyo kuwa na shughuli mbili - 309 00:14:44,170 --> 00:14:45,260 kushinikiza na pop. 310 00:14:45,260 --> 00:14:49,180 Yote ya kuweka katika kwamba mimi ni gesturing kama hii ni kushinikiza. 311 00:14:49,180 --> 00:14:52,020 Na kisha wakati mimi kufikia katika kunyakua kitu au kufikia juu kwa kunyakua 312 00:14:52,020 --> 00:14:53,940 kitu, kwamba pop. 313 00:14:53,940 --> 00:14:55,540 Hivyo sisi ni kwenda kutekeleza mwingi. 314 00:14:55,540 --> 00:14:57,870 Na sisi kuwaonyesha katika hotuba kutumia arrays. 315 00:14:57,870 --> 00:14:59,550 Lakini unaweza kufanya nao kutumia orodha wanaohusishwa. 316 00:14:59,550 --> 00:15:01,770 stack ni data dhana muundo, si kama 317 00:15:01,770 --> 00:15:03,760 utekelezaji maalum moja. 318 00:15:03,760 --> 00:15:06,420 >> Hivyo gani ili kuangalia kama? 319 00:15:06,420 --> 00:15:07,970 Itakuwa kuangalia aina ya kama hii. 320 00:15:07,970 --> 00:15:10,840 D na integer kawaida. 321 00:15:10,840 --> 00:15:16,000 Na wewe d kuwa safu ya maadili ambayo sisi ni wito trays, kwa sababu hiyo 322 00:15:16,000 --> 00:15:18,570 nini picha ilikuwa kwa ajili ya sisi - int trays - 323 00:15:18,570 --> 00:15:21,740 na kisha baadhi uwezo wa kiwango cha juu. 324 00:15:21,740 --> 00:15:27,100 Hivyo gani kushinikiza kuangalia kama? 325 00:15:27,100 --> 00:15:33,250 Naam, kama sisi na stack, basi kushinikiza kitu kwenye s, tunataka kupata 326 00:15:33,250 --> 00:15:34,620 ukubwa wa s. 327 00:15:34,620 --> 00:15:42,270 Na kwamba itakuwa ijayo doa wazi ya safu yetu. 328 00:15:42,270 --> 00:15:50,510 Hivyo kama sisi na mambo matatu katika stack yetu, kisha trays 3 itakuwa ijayo 329 00:15:50,510 --> 00:15:54,290 doa wazi, kwa sababu 0, 1, na 2 tayari kujazwa up. 330 00:15:54,290 --> 00:16:01,790 >> Hivyo sisi kuweka thamani katika s.trays [s.size], nafasi ya tatu. 331 00:16:01,790 --> 00:16:06,290 Na kisha sisi nyongeza s.size kusema, hey, tulikuwa na mambo matatu kabla ya. 332 00:16:06,290 --> 00:16:07,400 Sasa, tuna nne. 333 00:16:07,400 --> 00:16:10,180 Hivyo wakati mwingine kushinikiza, wewe ni kwenda kuweka kitu ndani ya 4. 334 00:16:10,180 --> 00:16:15,560 Au wakati mwingine pop, wewe kwenda kuangalia 3 badala ya 4 au chochote. 335 00:16:15,560 --> 00:16:18,000 Na kisha tutaweza kurudi kweli kwa kusema, hey, sisi wamefanikiwa. 336 00:16:18,000 --> 00:16:19,160 Hii kazi. 337 00:16:19,160 --> 00:16:22,060 Kama utawala wa thumb, kama kazi hiyo ni wanatakiwa kurudi kweli au 338 00:16:22,060 --> 00:16:26,370 uongo daima anarudi kweli, unaweza wamefanya kitu kibaya. 339 00:16:26,370 --> 00:16:28,350 Hivyo gani kazi hii? 340 00:16:28,350 --> 00:16:32,400 >> Naam, ni kazi nzuri kwa ajili 1, na 2, na 3, na 4, na tano. 341 00:16:32,400 --> 00:16:34,640 Lakini hebu sema mimi kufikia uwezo wangu. 342 00:16:34,640 --> 00:16:38,750 Nimekuwa kisha kukimbia katika tatizo, kwa sababu kama kawaida ni sawa na uwezo, mimi nina 343 00:16:38,750 --> 00:16:43,340 sasa ni kujaribu kuweka kitu ndani ya safu ambapo sina nafasi. 344 00:16:43,340 --> 00:16:46,980 Hivyo kuangalia short kurekebisha hii. 345 00:16:46,980 --> 00:16:51,630 Kama s.size == uwezo, kurudi uongo. 346 00:16:51,630 --> 00:16:54,130 Vinginevyo, kwenda na kufanya sisi alivyofanya. 347 00:16:54,130 --> 00:16:55,660 Hivyo kile kingine tunaweza kuuliza kuhusu kwa mwingi? 348 00:16:55,660 --> 00:16:56,460 Nini kingine unapaswa kujifunza? 349 00:16:56,460 --> 00:16:57,690 Nini kingine unapaswa mazoezi? 350 00:16:57,690 --> 00:17:01,030 >> Naam, utekelezaji wa pop. 351 00:17:01,030 --> 00:17:02,370 Sisi tayari alifanya kushinikiza. 352 00:17:02,370 --> 00:17:04,280 Mimi itabidi kurekebisha hiyo. 353 00:17:04,280 --> 00:17:08,180 utekelezaji mashirika yasiyo ya safu, ambapo matumizi ya orodha wanaohusishwa, labda. 354 00:17:08,180 --> 00:17:09,390 utekelezaji mashirika yasiyo ya int. 355 00:17:09,390 --> 00:17:10,940 Sisi tulikuwa ints hapa. 356 00:17:10,940 --> 00:17:11,880 Lakini inaweza kuwa ikifungwa. 357 00:17:11,880 --> 00:17:13,010 Mimi naweza kuwa masharti. 358 00:17:13,010 --> 00:17:14,290 Ni wangeweza nyota char. 359 00:17:14,290 --> 00:17:17,960 Angalia mambo yaliyopita ya Quizzes kwa aina ya maswali tumekuwa kuulizwa kuhusu mwingi. 360 00:17:17,960 --> 00:17:20,000 >> Mimi itabidi kusema kwamba sisi kufunikwa mwingi karibu sawa na tumekuwa kufunikwa yao katika 361 00:17:20,000 --> 00:17:20,540 miaka ya nyuma. 362 00:17:20,540 --> 00:17:24,400 Kwa hiyo, maswali jaribio lazima kuwa ni dalili nzuri. 363 00:17:24,400 --> 00:17:27,010 Kusonga mbele hata kwa kasi, foleni. 364 00:17:27,010 --> 00:17:28,200 Wao ni kama mwingi. 365 00:17:28,200 --> 00:17:29,960 Lakini wao ni kwanza, kwanza nje. 366 00:17:29,960 --> 00:17:33,530 Kama wewe ni Uingereza, neno foleni pengine alifanya mengi ya maana na wewe. 367 00:17:33,530 --> 00:17:36,390 Vinginevyo, unaweza kuwa na habari ya tukio hilo kama line. 368 00:17:36,390 --> 00:17:38,120 Wao kazi kama line katika duka la Apple. 369 00:17:38,120 --> 00:17:40,740 mtu wa kwanza kuonyesha hadi saa 3:00 asubuhi ni mara ya kwanza 370 00:17:40,740 --> 00:17:42,880 mtu kununua iPad yake. 371 00:17:42,880 --> 00:17:44,260 >> Hivyo tuna shughuli mbili - 372 00:17:44,260 --> 00:17:45,720 enqueue na dequeue. 373 00:17:45,720 --> 00:17:47,560 Enqueue unaweka mtu katika line. 374 00:17:47,560 --> 00:17:50,070 Dequeue pulls kwanza mtu off line. 375 00:17:50,070 --> 00:17:52,640 Tena, tunaweza kutekeleza hii kwa safu. 376 00:17:52,640 --> 00:17:54,880 Kwa hiyo kile ni struct sisi ilionyesha katika hotuba? 377 00:17:54,880 --> 00:17:57,660 Ilikuwa ni hii moja. 378 00:17:57,660 --> 00:17:59,300 Tena, idadi. 379 00:17:59,300 --> 00:18:02,020 Tena, ukubwa na hii mpya kitu mbele. 380 00:18:02,020 --> 00:18:04,880 Kwa nini kuna kitu kinachoitwa mbele? 381 00:18:04,880 --> 00:18:07,050 Ni index ya pili hiki kwa dequeue. 382 00:18:07,050 --> 00:18:12,210 Ni ndani tu kuweka wimbo wa guy kwanza kuonyesha juu, hivyo kwamba sisi 383 00:18:12,210 --> 00:18:15,005 unaweza kuvuta ni nje wakati tunahitaji. 384 00:18:15,005 --> 00:18:19,322 >> Dhahiri kuangalia maelezo ya hotuba na kujaribu kutekeleza enqueue na dequeue 385 00:18:19,322 --> 00:18:21,700 wakati kusoma kwa jaribio. 386 00:18:21,700 --> 00:18:23,190 Mambo muhimu kufikiria. 387 00:18:23,190 --> 00:18:27,260 Kumalizika kwa mpango wa karibu kama mbele pamoja na ukubwa mwisho juu kubwa kuliko uwezo. 388 00:18:27,260 --> 00:18:32,670 Tena, kama mfumo wako ni kamili, utaenda kuwa na tatizo. 389 00:18:32,670 --> 00:18:34,780 Hash meza umefanya kuona mbele. 390 00:18:34,780 --> 00:18:39,820 Wengi wenu pengine kutekelezwa haya juu ya pset6. 391 00:18:39,820 --> 00:18:44,210 Ni muundo ambayo ina lengo la kwa O (1) wakati mara kwa mara kuingizwa na O (1) 392 00:18:44,210 --> 00:18:46,430 mara kwa mara wakati chaguo-msingi. 393 00:18:46,430 --> 00:18:49,760 >> Katika CS50, sisi kutekelezwa hii kama safu ya orodha wanaohusishwa. 394 00:18:49,760 --> 00:18:53,690 sehemu muhimu kwa meza hash ni hash kazi. 395 00:18:53,690 --> 00:18:58,350 Hivyo ni waongofu mchango wako, hebu sema, kamusi neno, katika idadi, 396 00:18:58,350 --> 00:18:59,560 ambayo ni kwenda kuwa index yetu. 397 00:18:59,560 --> 00:19:01,410 Na tutaweza kutumia index katika safu yetu. 398 00:19:01,410 --> 00:19:05,374 Hivyo hapa ni cute picha kidogo kutoka study.50.net. 399 00:19:05,374 --> 00:19:08,060 Sisi kutupa maneno yote ndani ya hash kazi yetu. 400 00:19:08,060 --> 00:19:10,950 Na heshi inatuambia mahali pa kuweka maneno haya. 401 00:19:10,950 --> 00:19:15,650 >> Hii yote ni kubwa katika nchi ambapo kuna neno moja tu kwa kila yanayopangwa. 402 00:19:15,650 --> 00:19:20,480 Lakini kama unakumbuka kutoka pset6, kuna ni zaidi ya maneno inafaa. 403 00:19:20,480 --> 00:19:23,080 Hivyo kile kinachotokea wakati kupata mgongano? 404 00:19:23,080 --> 00:19:26,730 Badala ya kuhifadhi thamani moja katika, hebu sema, hash meza 3, wewe 405 00:19:26,730 --> 00:19:27,990 kuhifadhi orodha wanaohusishwa. 406 00:19:27,990 --> 00:19:32,900 Na hivyo badala ya kuwa tikiti maji hapa, ingekuwa orodha wanaohusishwa, 407 00:19:32,900 --> 00:19:34,190 ambapo node kwanza ni tikiti maji. 408 00:19:34,190 --> 00:19:35,260 Na node ya pili ni paka. 409 00:19:35,260 --> 00:19:38,970 Na node ya tatu ni mgongano, hebu kusema, kwa sababu maneno haya yote kuanza 410 00:19:38,970 --> 00:19:41,110 na C. 411 00:19:41,110 --> 00:19:42,700 >> Kwa hiyo wengi alifanya hivyo kwa pset6. 412 00:19:42,700 --> 00:19:45,685 Kama hakufanya meza hash juu ya pset6 na jaribio kitu kama 413 00:19:45,685 --> 00:19:47,720 trie, dhahiri kupitia meza hash. 414 00:19:47,720 --> 00:19:50,650 Kama hakuwa kufanya hivyo kwa pset6, dhahiri kupitia meza hash. 415 00:19:50,650 --> 00:19:53,610 Na kama wewe alifanya hivyo kwa pset6 na ilivyokuwa si kufanya kazi nje ya haki kabisa na wewe 416 00:19:53,610 --> 00:19:56,150 alikuwa na mengi ya shida na hayo, dhahiri kupitia meza hash. 417 00:19:56,150 --> 00:20:01,610 Somo kwa kweli ni dhahiri kupitia meza hash. 418 00:20:01,610 --> 00:20:07,130 >> wachache kubwa ya walijaribu nje anajaribu juu ya pset6. 419 00:20:07,130 --> 00:20:08,570 Kiwango cha juu cha picha. 420 00:20:08,570 --> 00:20:15,150 Ni kitu kama hii, ambapo kila node ina seti ya watoto, ambapo kila 421 00:20:15,150 --> 00:20:17,100 mtoto sambamba na barua. 422 00:20:17,100 --> 00:20:20,520 Na kila node pia anasema, hey, mimi neno. 423 00:20:20,520 --> 00:20:25,933 Hivyo katika mfano huu, neno Maxwell, kama wewe kufuata M kwa A kwa 424 00:20:25,933 --> 00:20:28,530 X-W-E-L-L na kisha kufuata moja zaidi. 425 00:20:28,530 --> 00:20:32,800 Na kupata alama hii, delta, ambayo sisi tumeni ujumbe kwa maana hii ni neno. 426 00:20:32,800 --> 00:20:34,780 Hivyo Maxwell ni neno. 427 00:20:34,780 --> 00:20:38,430 Delta Hizi ni katika akionyesha Hayo ndiyo mambo ambayo ni maneno na ambayo 428 00:20:38,430 --> 00:20:40,360 mambo si. 429 00:20:40,360 --> 00:20:46,400 >> Hivyo katika pset6, data sisi kuhifadhiwa pamoja na yoyote ya nodes yetu ilikuwa "Mimi ni 430 00:20:46,400 --> 00:20:52,630 neno. "Na jambo zuri kuhusu inajaribu ni wao kuonyesha kuingizwa na 431 00:20:52,630 --> 00:20:55,080 Luke katika O (urefu wa neno). 432 00:20:55,080 --> 00:20:59,450 Hivyo tu kupata njia ya Maxwell, ni M-A-X-W-E-L-L. Hivyo saba au nane - 433 00:20:59,450 --> 00:21:00,360 Siwezi kuhesabu - 434 00:21:00,360 --> 00:21:03,920 hatua ya kupata hadi mwisho na kuangalia mambo ya nje. 435 00:21:03,920 --> 00:21:06,800 Utekelezaji Hivyo haraka hapa. 436 00:21:06,800 --> 00:21:10,230 Rob akaenda kwa njia ya uhusiano orodha katika postmortem yake. 437 00:21:10,230 --> 00:21:11,600 Ili kuangalia kwamba nje. 438 00:21:11,600 --> 00:21:11,720 Sorry. 439 00:21:11,720 --> 00:21:13,240 Akaenda kwa njia ya trie katika postmortem yake. 440 00:21:13,240 --> 00:21:14,260 Ili kuangalia kwamba nje. 441 00:21:14,260 --> 00:21:24,410 >> Lakini kimsingi kuwa kila nodi ina 27 kuyatumia kwa nodes ya pili na moja 442 00:21:24,410 --> 00:21:27,050 Boolean kwa mimi neno. 443 00:21:27,050 --> 00:21:31,530 Angalia postmortem Rob kwa ajili ya jinsi hii kwa kweli ni kutekelezwa. 444 00:21:31,530 --> 00:21:34,750 Muundo wa mwisho wetu, miti yetu na miti binary search. 445 00:21:34,750 --> 00:21:41,530 Hivyo kuangalia haya, haya walikuwa kufunikwa hivi karibuni Wiki 8, Jumatatu. 446 00:21:41,530 --> 00:21:46,960 mti ni sawa na trie, ila wewe si lazima kuwa 27 nodes katika 447 00:21:46,960 --> 00:21:47,500 kila hatua. 448 00:21:47,500 --> 00:21:52,820 Na huna data hii katika kila hatua hiyo kunaashiria kama - 449 00:21:52,820 --> 00:21:54,030 njia haijalishi. 450 00:21:54,030 --> 00:22:00,870 Wakati trie, njia kutoka juu ya chini, Maxwell, ni muhimu kwetu. 451 00:22:00,870 --> 00:22:05,270 >> Lakini kila nodi ina nyingi watoto, pengine. 452 00:22:05,270 --> 00:22:07,290 Tuna baadhi ya msamiati zaidi. 453 00:22:07,290 --> 00:22:09,530 mizizi ya mti ni saa ya juu sana. 454 00:22:09,530 --> 00:22:12,520 Na sisi kusema kwamba bottommost sana nodes kwamba hawana 455 00:22:12,520 --> 00:22:14,530 watoto ni majani. 456 00:22:14,530 --> 00:22:18,040 Hivyo kama trie, mti ni muundo wa nodes. 457 00:22:18,040 --> 00:22:21,490 aina ya kawaida ya mti kwamba tunakwenda kuzungumza juu ya ni binary mti, ambapo 458 00:22:21,490 --> 00:22:26,040 kila nodi hana watoto au mtoto mmoja au watoto wawili. 459 00:22:26,040 --> 00:22:28,890 Hivyo picha hii hapa ni si mti binary, kwa sababu 460 00:22:28,890 --> 00:22:32,890 node 3 ana watoto watatu. 461 00:22:32,890 --> 00:22:38,140 >> Lakini kama tulikuwa kupuuza wale, wengine yake ni mti binary kwa sababu 462 00:22:38,140 --> 00:22:43,200 inaonyesha mali kwamba kila node ina zero, moja, au watoto wawili. 463 00:22:43,200 --> 00:22:46,400 Hivyo ni jinsi gani sisi kueleza hii katika kanuni? 464 00:22:46,400 --> 00:22:51,460 Tunaweza kuwa na node ambapo kila node ina integer ndani yake, kama vile 465 00:22:51,460 --> 00:22:55,590 kama pointer kwa mti upande wa kushoto na pointer kwa mti juu ya 466 00:22:55,590 --> 00:22:59,510 haki, hivyo watoto wawili. 467 00:22:59,510 --> 00:23:00,880 Jinsi hii ni muhimu? 468 00:23:00,880 --> 00:23:05,740 Naam, kama sisi kufanya sheria kuhusu ambapo sisi kuweka nodes, tunaweza kufanya search kwa kasi zaidi. 469 00:23:05,740 --> 00:23:10,630 >> Hivyo kuna dhana ya search binary mti, ambapo nodes yote juu ya 470 00:23:10,630 --> 00:23:14,420 kushoto subtree na thamani ndogo kuliko node sisi ni kuangalia. 471 00:23:14,420 --> 00:23:17,880 Na nodes yote juu ya subtree haki kuwa na thamani kubwa 472 00:23:17,880 --> 00:23:18,660 kuliko mzizi wa nodi. 473 00:23:18,660 --> 00:23:20,670 Sasa, kwamba inaonekana kama mengi ya maneno. 474 00:23:20,670 --> 00:23:23,770 Mimi nina kwenda kuweka ndani ya mara mbili quotes na kuonyesha picha. 475 00:23:23,770 --> 00:23:27,010 Hivyo hapa ni mfano wa binary search mti. 476 00:23:27,010 --> 00:23:28,770 Kuona kwamba sisi kuanza na 10. 477 00:23:28,770 --> 00:23:31,780 Kila kitu upande wa kushoto wa 10 ni ndogo zaidi. 478 00:23:31,780 --> 00:23:33,130 Na kila kitu kwa haki ni kubwa kuliko yake. 479 00:23:33,130 --> 00:23:37,620 >> Lakini zaidi ya hapo, kila nodi katika mti linaonyesha mali hii. 480 00:23:37,620 --> 00:23:42,110 Hivyo node 7 ina 3 kushoto na 9 na haki. 481 00:23:42,110 --> 00:23:44,440 Hivyo wale wote ni ndogo kuliko 10. 482 00:23:44,440 --> 00:23:50,470 Lakini kuangalia tu wale, 7 ina 3 upande wa kushoto wake na 9 kwa haki yake. 483 00:23:50,470 --> 00:23:56,100 Na vile vile juu ya haki, 15 ina 14 upande wa kushoto wake na 50 haki yake. 484 00:23:56,100 --> 00:24:03,770 Hivyo nodes tatu zaidi ya hapo, 15, 14, na 50, pia ni halali binary mti 485 00:24:03,770 --> 00:24:05,480 au halali binary search mti. 486 00:24:05,480 --> 00:24:07,250 Na wao uko wote kubwa kuliko 10. 487 00:24:07,250 --> 00:24:08,960 Hivyo wanaruhusiwa kuwa na juu ya haki pale. 488 00:24:08,960 --> 00:24:09,940 Je, kuna swali? 489 00:24:09,940 --> 00:24:12,580 >> Watazamaji: Je, unaweza kukabiliana wakati una sevens mbili? 490 00:24:12,580 --> 00:24:12,850 >> R.J. Aquino: Yeah. 491 00:24:12,850 --> 00:24:16,550 Jinsi gani unaweza kukabiliana na maadili mbili ambazo ni sawa? 492 00:24:16,550 --> 00:24:21,465 Baadhi ya miti binary search kusema kwamba kupuuza marudio, kwa sababu lengo ni 493 00:24:21,465 --> 00:24:24,280 tu kusema, nimeona mambo haya ili mbali. 494 00:24:24,280 --> 00:24:28,120 Baadhi ya binary miti search unaweza kusema na kuhesabu ndani ya nodi. 495 00:24:28,120 --> 00:24:32,000 Wengine wanaweza kusema kuwa kila kitu kwa kushoto ni chini ya au sawa na. 496 00:24:32,000 --> 00:24:33,470 Na kila kitu kwa haki ni mkubwa kuliko. 497 00:24:33,470 --> 00:24:36,520 >> Ni tu unategemea nini Tatizo ni wewe kutatua. 498 00:24:36,520 --> 00:24:40,840 Hivyo katika kamusi, kwa mfano, unaweza bila huduma ya juu marudio. 499 00:24:40,840 --> 00:24:41,490 Ungependa kutupa nje. 500 00:24:41,490 --> 00:24:44,719 Lakini baadhi ya tatizo nyingine unaweza huduma. 501 00:24:44,719 --> 00:24:49,242 >> Watazamaji: Je, inawezekana kuwa na 1 upande wa kushoto wa 15, ambayo 502 00:24:49,242 --> 00:24:50,590 ni chini ya 10? 503 00:24:50,590 --> 00:24:51,885 >> R.J. Aquino: Hapana 504 00:24:51,885 --> 00:24:56,570 Kama 14 hapa na 1, hii ingekuwa kuwa halali binary search mti, 505 00:24:56,570 --> 00:25:00,840 kwa sababu kila kitu na haki ya 10 ina kuwa kubwa kuliko yake. 506 00:25:00,840 --> 00:25:02,300 Na tutaweza kuona nini. 507 00:25:02,300 --> 00:25:07,960 Kama katika ardhi ya kutafuta lengo langu ni kupata 14, mimi kuanza kwenye mizizi. 508 00:25:07,960 --> 00:25:08,500 Basi, mimi kuangalia. 509 00:25:08,500 --> 00:25:08,710 OK. 510 00:25:08,710 --> 00:25:10,670 Sisi ni kwenda kuanza kwenye mizizi. 511 00:25:10,670 --> 00:25:12,500 Angalia saa 10. 512 00:25:12,500 --> 00:25:16,050 >> Naam, 14, lengo letu, ni kubwa kuliko 10. 513 00:25:16,050 --> 00:25:17,370 Hivyo ni lazima kuwa juu ya haki. 514 00:25:17,370 --> 00:25:21,780 Hii ni sawa na simu nzima kitabu kitu sisi hivyo, binary 515 00:25:21,780 --> 00:25:23,720 kutafuta huko. 516 00:25:23,720 --> 00:25:26,430 Lakini badala ya binary kutafuta katika safu, sisi ni binary 517 00:25:26,430 --> 00:25:28,490 kutafuta katika mti huu. 518 00:25:28,490 --> 00:25:31,260 Hivyo sisi ni bado kuangalia kwa 14. 519 00:25:31,260 --> 00:25:32,480 Naam, 14 ni ndogo kuliko 15. 520 00:25:32,480 --> 00:25:36,430 Hivyo kama ni katika mti wetu, ni lazima kuwa katika eneo hili hapa. 521 00:25:36,430 --> 00:25:39,680 Ni lazima na haki ya 10 na kwa upande wa kushoto wa miaka 15. 522 00:25:39,680 --> 00:25:42,250 >> Na hivyo sisi kuangalia node hii. 523 00:25:42,250 --> 00:25:45,790 Na yay, tumekuwa kupatikana 14. 524 00:25:45,790 --> 00:25:46,760 Mimi si kwenda kutembea kwa njia hiyo. 525 00:25:46,760 --> 00:25:48,090 Lakini hapa code. 526 00:25:48,090 --> 00:25:49,690 Ni kweli kiasi moja kwa moja, 527 00:25:49,690 --> 00:25:52,630 kwa sababu hii ni ya kujirudia. 528 00:25:52,630 --> 00:25:55,420 Nini tunaweza kuuliza wewe kufanya juu ya jaribio? 529 00:25:55,420 --> 00:25:57,000 Tunaweza kuuliza wewe kuandika kanuni hii. 530 00:25:57,000 --> 00:25:59,170 Tunaweza kuuliza wewe kuangalia kanuni hii na kurekebisha kanuni hii na kueleza kile 531 00:25:59,170 --> 00:26:00,210 ni kufanya. 532 00:26:00,210 --> 00:26:00,390 Yeah. 533 00:26:00,390 --> 00:26:00,770 Swali? 534 00:26:00,770 --> 00:26:04,240 >> Watazamaji: Je, slides hizi kwenda kuwa kupatikana kama walikuwa mara ya mwisho? 535 00:26:04,240 --> 00:26:04,740 >> R.J. Aquino: Ndiyo. 536 00:26:04,740 --> 00:26:06,460 Hivyo slides haya dhahiri kuwa posted. 537 00:26:06,460 --> 00:26:08,640 >> Watazamaji: Wao ni kweli zilizowekwa sasa hivi kwenye tovuti. 538 00:26:08,640 --> 00:26:10,020 David tu alifanya hivyo. 539 00:26:10,020 --> 00:26:12,720 >> R.J. Aquino: slides ni sasa hivi kwenye tovuti. 540 00:26:12,720 --> 00:26:16,420 Mimi itabidi pengine kiraka juu ya wanandoa wa typos mimi alibainisha na kurekebisha yao. 541 00:26:16,420 --> 00:26:19,940 Lakini kuna sasa toleo kwenye tovuti. 542 00:26:19,940 --> 00:26:21,820 Wengine mambo tunaweza kuuliza wewe kufanya - 543 00:26:21,820 --> 00:26:23,790 kuandika kuingiza. 544 00:26:23,790 --> 00:26:27,490 Kuandika toleo la usioisha ya kazi kujirudia sisi tu ilionyesha ninyi 545 00:26:27,490 --> 00:26:32,520 au kuzungumza juu ya mambo haya, kama katika aya, kwa maneno, katika hukumu. 546 00:26:32,520 --> 00:26:35,760 Kulinganisha mara kukimbia na kueleza nini wanataka kutumia binary 547 00:26:35,760 --> 00:26:39,200 search mti kwa badala ya hash meza, kwa mfano. 548 00:26:39,200 --> 00:26:43,580 >> Hivyo kuelewa miundo katika pretty kina ngazi. 549 00:26:43,580 --> 00:26:47,440 Kuelewa jinsi ya kuandika yao, jinsi ya matumizi yao, jinsi ya kuzungumza juu yao. 550 00:26:47,440 --> 00:26:50,270 Na wewe utakuwa na kuweka wote. 551 00:26:50,270 --> 00:26:50,630 Swali? 552 00:26:50,630 --> 00:26:55,070 >> Watazamaji: Wakati wewe ni kuandika binary search mti, jinsi gani unaweza 553 00:26:55,070 --> 00:27:01,460 kuamua thamani nini kufanya hivyo kama mizizi? 554 00:27:01,460 --> 00:27:06,120 >> R.J. Aquino: Kwa hiyo swali, ni nini thamani gani unaweza kufanya kama mizizi? 555 00:27:06,120 --> 00:27:08,760 Kulingana na kanuni yako, wewe inaweza kuwa na mizizi kimataifa. 556 00:27:08,760 --> 00:27:14,290 Hivyo unaweza kuwa uwezekano alikuwa katika pset6 kimataifa hash meza. 557 00:27:14,290 --> 00:27:18,640 Au unaweza kupita mzizi katika kama hoja. 558 00:27:18,640 --> 00:27:23,810 Hivyo hii kutafuta kazi hapa inachukua hoja node *. 559 00:27:23,810 --> 00:27:27,420 Na hivyo chochote node kutokea kwa kuwa kuangalia ni moja wewe ni kutibu 560 00:27:27,420 --> 00:27:31,510 kama mzizi yako wakati wewe kupita in 561 00:27:31,510 --> 00:27:32,320 Na mimi nina kuweka wote. 562 00:27:32,320 --> 00:27:33,480 Wale ni slides yangu. 563 00:27:33,480 --> 00:27:35,940 mtu mwingine anaweza kuja wabadilishane katika mbali na mic. 564 00:27:35,940 --> 00:27:47,390 565 00:27:47,390 --> 00:27:49,760 >> Rob BOWDEN: Nadhani anaweza kuwa na kutafsiriwa swali kwamba tofauti. 566 00:27:49,760 --> 00:27:53,826 Lakini mimi kufasiriwa kama, kama una namba 1, 2, na 3, ni jinsi gani sisi 567 00:27:53,826 --> 00:27:56,720 kujua kufanya 2 mzizi kinyume na 1 au 3? 568 00:27:56,720 --> 00:27:59,480 Kama sisi kufanya 2 mizizi, basi ni vizuri 1 na 3 kwa upande wa kushoto na kulia. 569 00:27:59,480 --> 00:28:04,610 Lakini kama 1 ni mzizi, basi ni 1 kwa juu, 2 haki, 3 na haki. 570 00:28:04,610 --> 00:28:10,880 Hivyo kwa default, hamjui nini cha kufanya mizizi. 571 00:28:10,880 --> 00:28:15,400 Na kwa algorithm yoyote sisi ni wanatarajia kukupa, tu Jambo la kwanza 572 00:28:15,400 --> 00:28:16,680 kuingiza itakuwa mizizi. 573 00:28:16,680 --> 00:28:19,890 Au tunatarajia kukupa mti binary kwamba tayari ipo ambayo ina mizizi. 574 00:28:19,890 --> 00:28:24,760 Lakini algorithms nyingine ipo kama kwamba mizizi update, hivyo kwamba kama 575 00:28:24,760 --> 00:28:28,370 kuishia katika hali ambapo ni 1, 2, 3, ingekuwa moja kwa moja update kwa 576 00:28:28,370 --> 00:28:30,900 kufanya 2 mzizi mpya, ili ni bado nicely uwiano. 577 00:28:30,900 --> 00:28:33,750 578 00:28:33,750 --> 00:28:34,833 >> ANGELA li: Cool. 579 00:28:34,833 --> 00:28:36,170 Hey, guys. 580 00:28:36,170 --> 00:28:37,810 Mimi nina Angela. 581 00:28:37,810 --> 00:28:42,490 Na mimi nina kwenda kumaliza mbali C yetu na kisha kwenda katika baadhi ya mtandao wetu 582 00:28:42,490 --> 00:28:43,120 teknolojia - 583 00:28:43,120 --> 00:28:46,570 HTTP, HTML, na CSS. 584 00:28:46,570 --> 00:28:49,610 Hivyo jambo la kwanza ni buffer kufurika mashambulizi. 585 00:28:49,610 --> 00:28:53,070 Hivyo basi tuangalie kanuni hii. 586 00:28:53,070 --> 00:28:54,260 Ni pretty rahisi. 587 00:28:54,260 --> 00:28:55,460 Kuna kazi foo. 588 00:28:55,460 --> 00:28:56,990 Na haina kurudi kitu chochote. 589 00:28:56,990 --> 00:29:00,950 Lakini inachukua katika pointer kwa string kuitwa bar. 590 00:29:00,950 --> 00:29:04,920 >> Na itakuja kutangaza hili buffer, ambayo ni tabia 591 00:29:04,920 --> 00:29:07,690 safu kwamba ina inafaa 12. 592 00:29:07,690 --> 00:29:11,730 Na inatumia memcpy, ambayo ni kazi ambayo nakala kutoka anwani moja 593 00:29:11,730 --> 00:29:12,910 ndani ya mwingine. 594 00:29:12,910 --> 00:29:19,400 Hivyo hii ni kujaribu nakala katika buffer yetu kutoka kila 595 00:29:19,400 --> 00:29:21,140 bar ni akizungumzia. 596 00:29:21,140 --> 00:29:24,640 Hivyo wazo lolote nini mbaya na kanuni hii? 597 00:29:24,640 --> 00:29:27,568 598 00:29:27,568 --> 00:29:30,830 >> Watazamaji: Kama bar ni zaidi ya C, wao itakuwa overwrite. 599 00:29:30,830 --> 00:29:31,520 >> ANGELA li: Yeah, hasa. 600 00:29:31,520 --> 00:29:34,200 Sisi hatuna uhakika kwamba bar ni kwenda kuwa chini ya 12. 601 00:29:34,200 --> 00:29:36,080 Sisi tu alifanya baadhi idadi holela 12. 602 00:29:36,080 --> 00:29:38,380 Na sisi kama, hebu matumaini kwamba pembejeo user yetu ni chini ya 603 00:29:38,380 --> 00:29:40,440 Wahusika 12 kwa muda mrefu. 604 00:29:40,440 --> 00:29:46,320 Hivyo katika ulimwengu bora, kama pembejeo yetu ni daima kama ilivyotarajiwa, kisha tutaweza kupata 605 00:29:46,320 --> 00:29:47,550 kitu kama, hello. 606 00:29:47,550 --> 00:29:48,920 Hiyo ni chini ya wahusika 12. 607 00:29:48,920 --> 00:29:51,870 Ni anapata kusoma katika char c. 608 00:29:51,870 --> 00:29:53,280 Na kisha sisi kufanya kitu kwa hayo. 609 00:29:53,280 --> 00:29:54,800 Ni kweli haina jambo. 610 00:29:54,800 --> 00:29:59,740 >> Lakini mtu malicious kufanya kitu zaidi kama hii, ambapo wao 611 00:29:59,740 --> 00:30:04,760 kutupa chochote bar ni akizungumzia, itakuja kwa uhakika na hii safu kubwa 612 00:30:04,760 --> 00:30:06,280 ya tu A ya. 613 00:30:06,280 --> 00:30:10,680 Na hii ni njia zaidi ya 12. 614 00:30:10,680 --> 00:30:13,830 Hivyo ni kwenda kwenda njia yote chini hapa ambapo kurudi 615 00:30:13,830 --> 00:30:15,420 anwani kutumika kuwa. 616 00:30:15,420 --> 00:30:17,860 Basi hebu kusema kazi hii inaitwa foo. 617 00:30:17,860 --> 00:30:20,970 Labda foo aliitwa na nyingine kazi, ambayo aliitwa na kuu. 618 00:30:20,970 --> 00:30:24,890 Hivyo wakati foo ni mbio, inahitaji kujua wapi kurudi. 619 00:30:24,890 --> 00:30:29,130 >> Kama foo aliitwa na baadhi ya kazi jina lake bazi, ina kujua kwamba ni 620 00:30:29,130 --> 00:30:30,250 got kwenda nyuma bazi. 621 00:30:30,250 --> 00:30:34,040 Na kwamba ni nini anwani hii kurudi hapa chini ni kutuambia. 622 00:30:34,040 --> 00:30:38,340 Lakini kama sisi overwrite ni pamoja na baadhi nyingine mitaani, katika kesi hii, ni 623 00:30:38,340 --> 00:30:42,650 uwakilishi wa anwani katika mwanzo wa buffer hii, basi 624 00:30:42,650 --> 00:30:45,240 nini hasa kinachoendelea kutokea ni kwamba badala ya kurudi nyuma na bazi, 625 00:30:45,240 --> 00:30:48,470 ambayo inaitwa kazi yetu, ni tu kwenda mbele ya kanuni hii. 626 00:30:48,470 --> 00:30:53,930 >> Na kama hii ilikuwa pale kwa sababu malicious hacker dude alikuja na 627 00:30:53,930 --> 00:30:56,820 sindano hii, basi labda kiasi hiki ya A ni si kweli A ya. 628 00:30:56,820 --> 00:31:02,030 Na ni kweli ya kificho tu kwamba mapumziko kompyuta yako au kitu. 629 00:31:02,030 --> 00:31:05,930 Hivyo kuwa kujihami kuhusu aina hii ya kitu, una kamwe kudhani kwamba 630 00:31:05,930 --> 00:31:09,120 pembejeo user ni baadhi ya kiasi cha wahusika. 631 00:31:09,120 --> 00:31:13,310 Kwa mfano, wakati walikuwa kufanya Speller, wewe waliambiwa kwamba maneno walikuwa 632 00:31:13,310 --> 00:31:15,580 kwenda tu kuwa wahusika 40 muda mrefu kiwango cha juu. 633 00:31:15,580 --> 00:31:16,570 Na kwamba ilikuwa nzuri. 634 00:31:16,570 --> 00:31:20,150 >> Lakini kama bado, basi ingekuwa kuhakikisha tu kusoma katika 45 635 00:31:20,150 --> 00:31:21,520 wahusika kwa wakati mmoja. 636 00:31:21,520 --> 00:31:24,430 Vinginevyo, unaweza overwrite buffer yako. 637 00:31:24,430 --> 00:31:26,140 Maswali yoyote juu ya hilo. 638 00:31:26,140 --> 00:31:26,733 Yeah. 639 00:31:26,733 --> 00:31:28,850 >> Watazamaji: Je, wewe tu kuzungumza zaidi kidogo kuhusu haya? 640 00:31:28,850 --> 00:31:29,790 >> ANGELA li: Sorry. 641 00:31:29,790 --> 00:31:31,040 Ndiyo. 642 00:31:31,040 --> 00:31:32,813 643 00:31:32,813 --> 00:31:35,870 >> Watazamaji: mic ni kwa ajili ya video. 644 00:31:35,870 --> 00:31:37,640 Mimi kujaribu na mradi huo. 645 00:31:37,640 --> 00:31:39,900 Hi, guys. 646 00:31:39,900 --> 00:31:40,920 Sup? 647 00:31:40,920 --> 00:31:45,330 Basi hebu kwenda juu ya mambo kadhaa katika CS50 maktaba, ambayo tumekuwa kutumia 648 00:31:45,330 --> 00:31:49,072 wote muhula, wengi wao wakiwa kupata pembejeo user. 649 00:31:49,072 --> 00:31:53,140 Kama unajua, wewe ni pamoja na CS50 maktaba na kufanya tu CS50.h, ambayo 650 00:31:53,140 --> 00:31:55,660 ina prototypes yote ya kazi ambayo unaweza kutumia, kama 651 00:31:55,660 --> 00:31:58,640 GetString na GetInt, na GetFloat, nakadhalika. 652 00:31:58,640 --> 00:32:02,870 Na kuna mstari huu moja katika CS50 maktaba ambayo amefafanua kamba, ambayo 653 00:32:02,870 --> 00:32:05,380 nyie wote tunajua kwa sasa ni tu char *. 654 00:32:05,380 --> 00:32:07,900 >> Lakini hebu kuchukua Peek katika jinsi GetString kazi. 655 00:32:07,900 --> 00:32:10,010 Hili ni toleo la abridged sana. 656 00:32:10,010 --> 00:32:15,090 Unaweza kuvuta up files CS50 maktaba kutoka, nadhani, manuals.CS50.net. 657 00:32:15,090 --> 00:32:16,750 Na unaweza kusoma kwa njia ya kazi halisi. 658 00:32:16,750 --> 00:32:19,330 Lakini hii inashughulikia baadhi ya sehemu muhimu. 659 00:32:19,330 --> 00:32:23,870 Hivyo tumeunda baadhi buffer pamoja na baadhi ya uwezo. 660 00:32:23,870 --> 00:32:27,570 Na nini cha kufanya ni sisi kupata tabia moja kwa wakati mmoja kutoka kiwango n. 661 00:32:27,570 --> 00:32:30,910 Hiyo ambapo pembejeo user Nakala katika console. 662 00:32:30,910 --> 00:32:33,430 >> Na hivyo sisi ni kwenda kusoma katika tabia ya muda mrefu kama siyo mpya 663 00:32:33,430 --> 00:32:37,220 line na si mwisho wa file, ambayo ni mwisho wa pembejeo kiwango. 664 00:32:37,220 --> 00:32:45,690 Na kwa kila tabia ya kuwa sisi kusoma katika, kama kwamba tabia ya mwisho juu ya kuongeza 665 00:32:45,690 --> 00:32:50,120 kwa idadi ya wahusika tumekuwa kusoma katika na ambayo ni zaidi ya uwezo wetu, 666 00:32:50,120 --> 00:32:53,490 kisha nini cha kufanya ni sisi tu resize wetu buffer ili mara mbili kwa muda mrefu. 667 00:32:53,490 --> 00:32:56,950 Hivyo tena, hii kulinda dhidi ya buffer mashambulizi ya kufurika, kwa sababu kusoma katika 668 00:32:56,950 --> 00:32:58,315 tabia ya wakati huo. 669 00:32:58,315 --> 00:33:02,290 Na kama katika hatua yoyote kusoma katika pia wengi, tu kupanua buffer yako. 670 00:33:02,290 --> 00:33:03,330 Wewe kuzidisha ni kwa mbili. 671 00:33:03,330 --> 00:33:05,510 Na kisha una nafasi zaidi. 672 00:33:05,510 --> 00:33:09,120 >> Vinginevyo, wewe tu kuongeza tabia ya buffer. 673 00:33:09,120 --> 00:33:15,080 Na baada ya umeisoma katika wote wahusika, itakuwa shrink buffer 674 00:33:15,080 --> 00:33:18,510 nyuma chini ya kawaida ya kawaida, kuongeza null Terminator, na kisha kurudi. 675 00:33:18,510 --> 00:33:21,880 676 00:33:21,880 --> 00:33:24,960 Sasa, hebu tuangalie GetInt. 677 00:33:24,960 --> 00:33:27,700 Je, unaweza guys kusoma hii? 678 00:33:27,700 --> 00:33:30,710 Mimi wanaweza kuvuta kidogo. 679 00:33:30,710 --> 00:33:33,410 680 00:33:33,410 --> 00:33:34,660 Sijui jinsi ya kompyuta kazi. 681 00:33:34,660 --> 00:33:40,840 682 00:33:40,840 --> 00:33:41,270 Kamwe akili. 683 00:33:41,270 --> 00:33:42,520 Siwezi kuvuta vizuri. 684 00:33:42,520 --> 00:33:47,500 685 00:33:47,500 --> 00:33:48,770 >> Hii ni ngumu kweli kweli. 686 00:33:48,770 --> 00:33:49,180 Mimi nina sorry. 687 00:33:49,180 --> 00:33:51,490 Hebu na tuangalie katika hili. 688 00:33:51,490 --> 00:33:57,140 Kwa hiyo kile GetInt gani ni ya kwanza wasomaji katika kamba kutoka GetString, ambayo 689 00:33:57,140 --> 00:33:59,250 tumekuwa kutekelezwa kabla ya. 690 00:33:59,250 --> 00:34:02,945 Na sehemu muhimu kutambua hapa ni kama kugawana hii inaishia 691 00:34:02,945 --> 00:34:06,400 kusoma ni kama si kweli kamba, kisha sisi tu kurudi INT_MAX kwa 692 00:34:06,400 --> 00:34:09,409 kuwakilisha kushindwa. 693 00:34:09,409 --> 00:34:12,645 Kwa nini sisi kurudi INT_MAX badala hasi 1 au 1? 694 00:34:12,645 --> 00:34:13,895 Mawazo yoyote? 695 00:34:13,895 --> 00:34:16,853 696 00:34:16,853 --> 00:34:19,350 >> Watazamaji: [inaudible] hasi 1 kwa moja. 697 00:34:19,350 --> 00:34:20,070 >> ANGELA li: Yeah, hasa. 698 00:34:20,070 --> 00:34:24,560 Basi, wewe ni njia zaidi uwezekano wa kutaka tu pembejeo 1 au hasi 1 wakati ilisababisha 699 00:34:24,560 --> 00:34:27,469 kwa nth na chochote nth maxes. 700 00:34:27,469 --> 00:34:27,969 Ni kubwa. 701 00:34:27,969 --> 00:34:29,690 Wewe ni pengine si kwenda matumizi yake. 702 00:34:29,690 --> 00:34:32,690 Hivyo hii ni kama uamuzi wa kubuni kwa kuhakikisha kwamba huna ajali 703 00:34:32,690 --> 00:34:38,540 kurudi kosa au huna kurudi 1, ambayo inaweza kuchanganuliwa 704 00:34:38,540 --> 00:34:41,199 kama jibu sahihi. 705 00:34:41,199 --> 00:34:45,110 Hivyo kama line haipo, sisi kurudi INT-MAX. 706 00:34:45,110 --> 00:34:48,090 Vinginevyo, sisi kutumia sscanf, ambayo ni kama scanf. 707 00:34:48,090 --> 00:34:49,449 Lakini wasomaji kutoka kamba. 708 00:34:49,449 --> 00:34:54,310 >> Na tuna hii formatted kamba, ambayo ni% i% c. 709 00:34:54,310 --> 00:34:57,440 Na sisi kujaribu na mechi hiyo kwa chochote user alitoa yetu. 710 00:34:57,440 --> 00:35:01,420 Tunataka idadi ya mambo kuendana kuwa 1, ambayo ina maana kwamba sisi tu 711 00:35:01,420 --> 00:35:04,940 kweli wanataka mechi integer kuzungukwa na labda nyeupe 712 00:35:04,940 --> 00:35:06,840 nafasi, labda si. 713 00:35:06,840 --> 00:35:10,710 Katika kesi hiyo, kama wewe kuweka katika kitu kama bar, bar hailingani wakati wote, 714 00:35:10,710 --> 00:35:14,400 kwa sababu kuna haja ya kuwa integer mwanzoni. 715 00:35:14,400 --> 00:35:17,060 Hivyo sscan kamwe akageuka 0. 716 00:35:17,060 --> 00:35:19,640 Hivyo huna kurudi hiyo. 717 00:35:19,640 --> 00:35:23,850 >> Vinginevyo, kama wewe kuweka katika kitu kama 1, 2, 3, A, B, C, kwamba mechi 718 00:35:23,850 --> 00:35:27,180 wote integer lakini pia tabia ya baada ya yake. 719 00:35:27,180 --> 00:35:29,990 Hivyo sscanf atarudi 2, ambayo ni pia si bora. 720 00:35:29,990 --> 00:35:34,620 Hawataki 1, 2, 3, A, B, C kuwa halali int. 721 00:35:34,620 --> 00:35:36,990 Ili pia haifanyi kazi. 722 00:35:36,990 --> 00:35:38,530 Lakini kusema kuweka katika kitu kama 50. 723 00:35:38,530 --> 00:35:42,460 Kwamba mechi% i, ambayo ina maana ni kupata kusoma katika n. 724 00:35:42,460 --> 00:35:44,790 Na sasa, n vyenye idadi 50. 725 00:35:44,790 --> 00:35:46,110 Na kisha unaweza kurudi. 726 00:35:46,110 --> 00:35:49,270 >> Vinginevyo, wewe hit Jaribu tena. 727 00:35:49,270 --> 00:35:55,790 Na kisha huenda tu tena mpaka kupata pembejeo sahihi kutoka kwa mtumiaji. 728 00:35:55,790 --> 00:35:56,891 Maswali yoyote juu ya hilo? 729 00:35:56,891 --> 00:36:02,182 >> Watazamaji: Hivyo kama ungekuwa na magazeti nje thamani ya GetInt juu ya [inaudible] 730 00:36:02,182 --> 00:36:06,250 itakuwa ni tu integer na max? 731 00:36:06,250 --> 00:36:07,440 >> ANGELA li: Yeah. 732 00:36:07,440 --> 00:36:11,780 Hivyo kama wewe kutumia GetInt, unapaswa kudhani kwamba hawataki nth max kwa 733 00:36:11,780 --> 00:36:15,328 pembejeo halali, kwa sababu wewe utaenda kudhani kwamba ilikuwa mbaya. 734 00:36:15,328 --> 00:36:27,740 >> Watazamaji: Kama hatukuwa na char c na mtu kuweka katika 1, 2, 3, Sam, ingekuwa ni 735 00:36:27,740 --> 00:36:29,430 bado kazi kwa ajili ya 1, 2, 3? 736 00:36:29,430 --> 00:36:29,750 >> ANGELA li: Nadhani ingekuwa kazi. 737 00:36:29,750 --> 00:36:33,340 Lakini hawataki 123Sam kwa pembejeo halali kwa mtumiaji. 738 00:36:33,340 --> 00:36:34,670 Hiyo ni kweli si int. 739 00:36:34,670 --> 00:36:36,840 Hivyo haionekani haki kwa Hazrat ni kama int. 740 00:36:36,840 --> 00:36:40,910 741 00:36:40,910 --> 00:36:42,160 OK. 742 00:36:42,160 --> 00:36:45,800 Katika kesi hiyo, hebu hoja kwenye mtandao. 743 00:36:45,800 --> 00:36:49,120 Hivyo HTTP ni si lugha. 744 00:36:49,120 --> 00:36:56,060 HTTP ni kuweka viwango kwa ajili ya jinsi gani kupeleka yale mambo kutoka kwa wateja, 745 00:36:56,060 --> 00:36:57,280 kwamba wewe, kwa watumishi. 746 00:36:57,280 --> 00:36:59,730 Hiyo ni watu wengine kwenye mtandao. 747 00:36:59,730 --> 00:37:02,900 >> Hivyo HTTP anasimama kwa HyperText Kuhamisha Itifaki. 748 00:37:02,900 --> 00:37:04,610 Ni moyo na roho ya yote mtandao. 749 00:37:04,610 --> 00:37:07,050 hypertext sehemu tu inahusu HTML. 750 00:37:07,050 --> 00:37:10,690 uhamisho ni wateja kama wewe kutuma maombi ya 751 00:37:10,690 --> 00:37:13,060 watumishi, ambayo kuwapa majibu. 752 00:37:13,060 --> 00:37:16,380 Na itifaki ni tu, jinsi gani unatarajia server ya kuishi? 753 00:37:16,380 --> 00:37:19,960 Gani na jinsi gani wanatakiwa kuishi kama kwamba unaweza kuboresha hii 754 00:37:19,960 --> 00:37:21,920 mawasiliano mchakato? 755 00:37:21,920 --> 00:37:26,650 >> Hivyo maombi HTTP kuangalia sana kama hii. 756 00:37:26,650 --> 00:37:28,070 GET ni aina ya ombi. 757 00:37:28,070 --> 00:37:31,220 You guys tumeona maombi GET na maombi POST. 758 00:37:31,220 --> 00:37:36,690 Hiyo Jambo la pili huko, / yangu, kwamba tu URI au URL wapi 759 00:37:36,690 --> 00:37:38,140 unataka kwenda ndani ya jeshi. 760 00:37:38,140 --> 00:37:44,140 Hivyo ombi hili ni kuuliza kwa ukurasa, kama www.facebook.com / yangu. 761 00:37:44,140 --> 00:37:45,300 Na ni ombi GET. 762 00:37:45,300 --> 00:37:51,020 Na kisha HTTP/1.1 hii, kwamba tu toleo la HTTP unatumia. 763 00:37:51,020 --> 00:37:55,020 Ni karibu kila mara 1.1. 764 00:37:55,020 --> 00:37:56,880 >> Na kisha kuna rundo ya mambo mengine pia. 765 00:37:56,880 --> 00:38:02,510 Unaweza kweli kuona haya ikiwa kufungua console yako wakati uko 766 00:38:02,510 --> 00:38:03,770 browsing kwenye mtandao. 767 00:38:03,770 --> 00:38:07,290 Majibu kuangalia kitu zaidi kama hii. 768 00:38:07,290 --> 00:38:09,620 sehemu ya juu ni mara ya pili, aina ya HTTP unatumia 769 00:38:09,620 --> 00:38:12,310 ikifuatiwa na hali ya code. 770 00:38:12,310 --> 00:38:14,700 Hivyo 200 OK ni kila kitu kazi nje. 771 00:38:14,700 --> 00:38:16,200 Hapa ni maudhui yako. 772 00:38:16,200 --> 00:38:17,390 Maudhui yako ni kwenda kufuata. 773 00:38:17,390 --> 00:38:21,730 Na kisha itakuambia ni aina gani ya bidhaa na mambo mengine pia. 774 00:38:21,730 --> 00:38:24,620 >> codes hali, kuna wachache muhimu wale ambao unapaswa kujua. 775 00:38:24,620 --> 00:38:26,460 200 OK ni kama dhahabu kila kitu. 776 00:38:26,460 --> 00:38:28,490 Kila kitu kazi. 777 00:38:28,490 --> 00:38:29,710 403 Haramu. 778 00:38:29,710 --> 00:38:32,910 Hii ve pengine kuona kama alisahau kwa chmod kitu vizuri. 779 00:38:32,910 --> 00:38:34,510 Maana yake ni kwamba huna ruhusa haki ya 780 00:38:34,510 --> 00:38:36,210 kupata kwamba kwenye kompyuta. 781 00:38:36,210 --> 00:38:38,110 Ni kama, hakuna, huwezi kuona. 782 00:38:38,110 --> 00:38:39,780 404 ina maana kwamba kitu haipo. 783 00:38:39,780 --> 00:38:40,400 Haikupatikana. 784 00:38:40,400 --> 00:38:41,640 Ve pengine kuona kwamba mengi. 785 00:38:41,640 --> 00:38:45,510 >> 500 Ndani Error Server ni kawaida kama kitu potoka upande 786 00:38:45,510 --> 00:38:46,460 ya server. 787 00:38:46,460 --> 00:38:50,830 Hivyo wakati wewe walikuwa utekelezaji wa pset7, kama alikuwa na PHP makosa, unaweza 788 00:38:50,830 --> 00:38:53,890 kweli kwenda kwenye ukurasa na kuona kundi zima la PHP makosa mambo ya ajabu. 789 00:38:53,890 --> 00:38:56,900 Lakini hiyo haina kawaida kutokea, kwa sababu ya Nje si kweli wanataka 790 00:38:56,900 --> 00:38:58,830 kukuambia kwa nini tovuti yao ni kuvunjwa. 791 00:38:58,830 --> 00:39:03,370 Wao itabidi pengine tu kurudi 500 Ndani Error Server. 792 00:39:03,370 --> 00:39:06,120 >> Na kisha kuna 418 mimi nina buli. 793 00:39:06,120 --> 00:39:07,910 Kuna hadithi nzima kuhusu kwa nini hilo ni jambo. 794 00:39:07,910 --> 00:39:09,860 Lakini unaweza kusoma kuhusu kwamba wakati yako mwenyewe. 795 00:39:09,860 --> 00:39:11,450 Kuna kundi zima la namba nyingine hali pia. 796 00:39:11,450 --> 00:39:12,700 Lakini hao ndio unapaswa kujua. 797 00:39:12,700 --> 00:39:15,660 798 00:39:15,660 --> 00:39:18,610 Hivyo basi majadiliano juu ya HTML. 799 00:39:18,610 --> 00:39:22,180 HTML, kumbuka, si lugha ya programu. 800 00:39:22,180 --> 00:39:23,510 Ni lugha ghafi. 801 00:39:23,510 --> 00:39:25,210 Hiyo ina maana inaelezea maudhui. 802 00:39:25,210 --> 00:39:30,440 Ni anaelezea nini HTML hati inaonekana kama au si nini inaonekana kama 803 00:39:30,440 --> 00:39:32,230 lakini ni jinsi gani muundo. 804 00:39:32,230 --> 00:39:36,110 >> Hivyo amefafanua muundo na semantiki ya kurasa za mtandao. 805 00:39:36,110 --> 00:39:37,830 Ni kama, hii ni aya. 806 00:39:37,830 --> 00:39:40,060 Hii ni orodha aliamuru. 807 00:39:40,060 --> 00:39:42,360 Hii ni kama sehemu ya ukurasa wangu. 808 00:39:42,360 --> 00:39:43,260 Hapa ni cheo. 809 00:39:43,260 --> 00:39:44,310 Ni gani mambo kama hayo. 810 00:39:44,310 --> 00:39:48,770 Haina style yoyote ya kwamba, kwa sababu kwamba ni nini kufanya katika CSS. 811 00:39:48,770 --> 00:39:50,270 Na inaonekana kama mfululizo ya Furushi vitambulisho. 812 00:39:50,270 --> 00:39:54,720 Hivyo kutumia mfano wa kweli ya msingi Ukurasa HTML, una DOCTYPE 813 00:39:54,720 --> 00:39:56,720 tamko huko. 814 00:39:56,720 --> 00:40:00,940 >> Tamko hili DOCTYPE ni akisema, sisi ni kutumia HTML5. 815 00:40:00,940 --> 00:40:03,370 Kisha una kubwa HTML tag. 816 00:40:03,370 --> 00:40:05,230 Ina kichwa na mwili. 817 00:40:05,230 --> 00:40:06,970 Ndani ya kichwa, una cheo. 818 00:40:06,970 --> 00:40:12,950 Hiyo ni nini huenda katika cheo bar ya browser yako. 819 00:40:12,950 --> 00:40:15,810 Tuna tag kiungo kwamba viungo katika karatasi ya nje style. 820 00:40:15,810 --> 00:40:19,880 Na kisha tuna script kwamba pulls kutoka nje JavaScript pia. 821 00:40:19,880 --> 00:40:23,750 >> Na kisha ndani ya mwili wetu ni kweli nini anapata imeonyesha juu ya ukurasa. 822 00:40:23,750 --> 00:40:28,210 Sisi tumepewa aya na kisha picha ndani ya aya hiyo. 823 00:40:28,210 --> 00:40:32,000 Hii ni moja ya picha ya kittens. 824 00:40:32,000 --> 00:40:35,840 Taarifa kwamba picha tag kufunga yenyewe. 825 00:40:35,840 --> 00:40:41,760 Hivyo badala ya ufunguzi na picha na kisha kufanya mwingine / picha, wewe 826 00:40:41,760 --> 00:40:47,500 tu hii kufyeka kidogo hapa, ambayo inafunga yake. 827 00:40:47,500 --> 00:40:53,670 Na tag picha pia ina hii muhimu thamani sifa aitwaye alt. 828 00:40:53,670 --> 00:40:56,970 Hiyo ni Nakala mbadala ambayo hutokea wakati hover juu yake. 829 00:40:56,970 --> 00:41:03,170 >> Wengi HTML mambo na baadhi thamani muhimu mambo ambayo unaweza kufanya hivyo, mbalimbali 830 00:41:03,170 --> 00:41:04,420 customization. 831 00:41:04,420 --> 00:41:06,230 832 00:41:06,230 --> 00:41:08,705 Yeah. 833 00:41:08,705 --> 00:41:09,955 >> Watazamaji: [inaudible]. 834 00:41:09,955 --> 00:41:17,510 835 00:41:17,510 --> 00:41:19,680 >> ANGELA li: Naam, hivyo ni sifa ya tag. 836 00:41:19,680 --> 00:41:25,320 Hivyo kama wewe walikuwa kutumia jQuery, unaweza kufanya kuchagua image.getAttribute. 837 00:41:25,320 --> 00:41:27,930 Na kisha unaweza kutafuta kupata alt sifa. 838 00:41:27,930 --> 00:41:31,040 Na nitakupa kittens. 839 00:41:31,040 --> 00:41:37,400 Kama unakumbuka aina katika HTML, pembejeo mambo itakuwa na sifa jina. 840 00:41:37,400 --> 00:41:41,870 Na kwamba ni nini PHP anatumia kutuma maombi wakati aina ni kuwasilishwa. 841 00:41:41,870 --> 00:41:44,762 842 00:41:44,762 --> 00:41:50,064 >> Watazamaji: Je, kutaja kitu kuhusu jinsi ya kama wewe kutumia kittens.jpg au 843 00:41:50,064 --> 00:41:54,410 jambo ambalo missing faili folders au faili nyingine? 844 00:41:54,410 --> 00:41:54,750 >> ANGELA li: Ndiyo. 845 00:41:54,750 --> 00:41:57,010 Hivyo hii ni kile kinachoitwa jamaa njia, kwa sababu mimi si kutoa 846 00:41:57,010 --> 00:41:58,740 ninyi njia kamili. 847 00:41:58,740 --> 00:42:05,160 Hii ni kama wakati katika C kama wewe kufanya fopen baadhi ya faili, kama fopen hi.txt, kwamba 848 00:42:05,160 --> 00:42:09,190 hi.txt unatarajiwa kuwa katika huo directory, isipokuwa kuwapa zaidi 849 00:42:09,190 --> 00:42:11,530 tata njia. 850 00:42:11,530 --> 00:42:14,900 >> Watazamaji: Hivyo unaweza bayana ambayo folder [inaudible]? 851 00:42:14,900 --> 00:42:17,660 >> ANGELA li: Yeah. 852 00:42:17,660 --> 00:42:19,370 Na unaweza kuangalia juu ya jinsi ya kufanya hivyo. 853 00:42:19,370 --> 00:42:23,480 Lakini kama nilitaka kupata kittens.jpg nje ya saraka ya mzazi, napenda kufanya 854 00:42:23,480 --> 00:42:24,730 .. / Kittens.jpg. 855 00:42:24,730 --> 00:42:29,680 856 00:42:29,680 --> 00:42:30,930 Yeah. 857 00:42:30,930 --> 00:42:32,960 858 00:42:32,960 --> 00:42:33,760 Sorry. 859 00:42:33,760 --> 00:42:34,045 Yeah. 860 00:42:34,045 --> 00:42:35,700 Oh mtu, I forgot swali. 861 00:42:35,700 --> 00:42:36,460 Nini swali? 862 00:42:36,460 --> 00:42:39,570 Oh, swali ni, kittens.jpg inatarajiwa kuwa katika orodha hiyo? 863 00:42:39,570 --> 00:42:40,630 Na katika kesi hii, ni. 864 00:42:40,630 --> 00:42:44,030 Lakini pia unaweza kuwapa njia fulani kama kwamba hana kuwa. 865 00:42:44,030 --> 00:42:47,100 866 00:42:47,100 --> 00:42:48,350 Nzuri? 867 00:42:48,350 --> 00:42:50,190 868 00:42:50,190 --> 00:42:51,350 >> CSS. 869 00:42:51,350 --> 00:42:55,420 Hivyo CSS, kama HTML, ni si lugha ya programu. 870 00:42:55,420 --> 00:42:58,250 CSS ni mfululizo wa styling sheria. 871 00:42:58,250 --> 00:43:00,130 Anasimama kwa kuachia Style Sheets. 872 00:43:00,130 --> 00:43:03,910 Na matumizi yake kwa kushirikiana na HTML kurasa style. 873 00:43:03,910 --> 00:43:08,140 Hivyo kuna njia tatu unaweza pamoja na hiyo. 874 00:43:08,140 --> 00:43:11,950 Njia moja unaweza kufanya hivyo ni katika kichwa sehemu ya HTML yako, unaweza tu 875 00:43:11,950 --> 00:43:15,410 kufungua tag style na kisha fimbo baadhi CSS sheria huko. 876 00:43:15,410 --> 00:43:16,759 Ni pretty OK. 877 00:43:16,759 --> 00:43:17,228 Yeah. 878 00:43:17,228 --> 00:43:21,449 >> Watazamaji: Unaweza kuweka wale tags style katika kati ya, hebu 879 00:43:21,449 --> 00:43:22,860 kusema, mwili na / mwili. 880 00:43:22,860 --> 00:43:27,400 Na kisha itakuwa styling tu katika mwili. 881 00:43:27,400 --> 00:43:28,840 >> ANGELA li: Unaweza. 882 00:43:28,840 --> 00:43:29,590 Kutakuwa na kazi. 883 00:43:29,590 --> 00:43:33,990 Lakini hawapaswi, kwa sababu styling ni aina ya metadata kwamba lazima kwenda katika 884 00:43:33,990 --> 00:43:35,890 mkuu wa hati yako. 885 00:43:35,890 --> 00:43:38,280 Mwili lazima kweli tu vyenye nini kweli kwenda 886 00:43:38,280 --> 00:43:39,420 show up kwenye ukurasa wako. 887 00:43:39,420 --> 00:43:42,155 >> Watazamaji: Hivyo wewe d kuweka style katika kichwa yako style 888 00:43:42,155 --> 00:43:43,930 mtandao mzima ukurasa, haki? 889 00:43:43,930 --> 00:43:44,300 >> ANGELA li: Yeah. 890 00:43:44,300 --> 00:43:50,470 Hivyo kuweka style hapa, CSS sheria hizi itatumika nzima ukurasa msingi 891 00:43:50,470 --> 00:43:52,100 selectors yao. 892 00:43:52,100 --> 00:43:57,090 Hivyo njia bora ya kufanya hivyo ni badala ya kuwa na tag style katika kichwa yako, 893 00:43:57,090 --> 00:44:00,430 una kiungo hiki style nje karatasi kama mimi ilionyesha katika 894 00:44:00,430 --> 00:44:01,980 mfano uliopita. 895 00:44:01,980 --> 00:44:05,920 Nini hii ni anajaribu na hupata faili style.css na kisha pulls ni 896 00:44:05,920 --> 00:44:08,470 katika na matumizi ya kwamba kama mitindo kwa ukurasa. 897 00:44:08,470 --> 00:44:10,500 Na style.css yako ingekuwa tu kuangalia kama hii. 898 00:44:10,500 --> 00:44:13,330 Itakuwa tu kuwa kundi la CSS. 899 00:44:13,330 --> 00:44:16,210 >> Na hatimaye, kuna njia nyingine wewe ni kama CSS, ambayo kwa kweli 900 00:44:16,210 --> 00:44:17,480 haipaswi milele kufanya. 901 00:44:17,480 --> 00:44:18,950 Ni mwito inline styling. 902 00:44:18,950 --> 00:44:22,650 Na hivyo yeyote hiki HTML unaweza pia kuchukua style sifa. 903 00:44:22,650 --> 00:44:26,320 Na kisha katika style sifa, unaweza kuwapa sheria CSS. 904 00:44:26,320 --> 00:44:29,140 Hivyo katika kesi hii, bila kujali div mimi nina kufafanua haki hapa, ni kwenda kwa 905 00:44:29,140 --> 00:44:32,580 na background nyeusi na nyeupe rangi ya maandishi. 906 00:44:32,580 --> 00:44:35,620 Lakini si lazima kufanya hivyo, kwa sababu kile hii haina ni unaweka styling yako 907 00:44:35,620 --> 00:44:36,850 ndani ya HTML yako. 908 00:44:36,850 --> 00:44:40,530 >> Na Mimi najua tumekuwa kuzungumza juu ya HTML ni muundo na CSS ni style. 909 00:44:40,530 --> 00:44:42,790 Kama kufanya hivyo, huchanganyika pamoja. 910 00:44:42,790 --> 00:44:44,550 Na si safi sana. 911 00:44:44,550 --> 00:44:45,800 Hivyo si kufanya hivyo. 912 00:44:45,800 --> 00:44:47,690 913 00:44:47,690 --> 00:44:52,100 Kutumia mfano wa CSS, huko, sisi tu kuchagua mwili wa HTML 914 00:44:52,100 --> 00:44:52,380 documentary. 915 00:44:52,380 --> 00:44:55,110 Na sisi ni kama, kila kitu kwenda kuwa Comic Sans. 916 00:44:55,110 --> 00:44:57,290 Mimi pia kupendekeza kwamba. 917 00:44:57,290 --> 00:44:59,940 Lakini unaweza kufanya hivyo. 918 00:44:59,940 --> 00:45:03,140 >> utawala pili kulia hapa, ni kwenda kuchagua hiki juu ya 919 00:45:03,140 --> 00:45:04,880 ukurasa kwa ID kuu. 920 00:45:04,880 --> 00:45:11,690 Kwa hiyo chochote HTML hiki, mimi alisema ID = Kuu, mimi nina kwenda kutoa kwamba a 921 00:45:11,690 --> 00:45:16,020 20-pixel kiasi na align kila kitu, Nakala wote, kwa kituo hicho. 922 00:45:16,020 --> 00:45:19,030 Jambo la mwisho teua na CSS darasa. 923 00:45:19,030 --> 00:45:24,450 Hivyo hiki yoyote juu ya ukurasa kwamba mimi alitoa sehemu darasa, mimi nina kwenda kufanya ni 924 00:45:24,450 --> 00:45:26,602 rangi ya asili ya mwanga wa bluu. 925 00:45:26,602 --> 00:45:29,380 926 00:45:29,380 --> 00:45:30,040 Yep. 927 00:45:30,040 --> 00:45:30,700 Hayo ni yote Mimi got. 928 00:45:30,700 --> 00:45:30,890 Swali? 929 00:45:30,890 --> 00:45:34,020 >> Watazamaji: Nini maana alama kabla ya kuu nini? 930 00:45:34,020 --> 00:45:36,310 >> ANGELA li: swali ni, nini alama kabla ya kufanya kuu? 931 00:45:36,310 --> 00:45:40,770 Katika kesi hiyo, hash katika CSS maana kuchagua na ID. 932 00:45:40,770 --> 00:45:47,490 Basi, ikiwa mimi na baadhi ya hiki HTML, kama divID = kuu, CSS utawala huu kuchagua 933 00:45:47,490 --> 00:45:49,260 kitu na ID kuu. 934 00:45:49,260 --> 00:45:53,940 Na vile vile, kipindi mbele ya sehemu ni kuchagua na CSS darasa au 935 00:45:53,940 --> 00:45:56,558 kuchagua kwa HTML darasa. 936 00:45:56,558 --> 00:46:00,940 >> Watazamaji: Kwa nini kuna ina kabla ya 6 katika rangi ya asili? 937 00:46:00,940 --> 00:46:01,270 >> ANGELA li: Yeah. 938 00:46:01,270 --> 00:46:03,360 Hivyo, swali ni kwa nini kuna hash kabla ya 6? 939 00:46:03,360 --> 00:46:05,320 Hii ni tofauti na ule hash. 940 00:46:05,320 --> 00:46:09,500 Hii ina maana kwamba wewe ni kutoa hexadesimoli rangi. 941 00:46:09,500 --> 00:46:14,260 Rangi ili hex, hii tu inawakilisha rangi. 942 00:46:14,260 --> 00:46:17,860 Na unakumbuka RGB triples wakati alifanya forensics pset? 943 00:46:17,860 --> 00:46:18,770 Hii ni sawa. 944 00:46:18,770 --> 00:46:21,590 tarakimu mbili za kwanza kuwakilisha kiasi gani nyekundu ni katika rangi. 945 00:46:21,590 --> 00:46:23,260 pili wawili kuwakilisha kiasi gani ya kijani. 946 00:46:23,260 --> 00:46:25,450 Na tatu inawakilisha kiasi gani rangi ya bluu. 947 00:46:25,450 --> 00:46:30,060 Na hash ni hii ni kwenda kuwakilisha rangi. 948 00:46:30,060 --> 00:46:35,660 >> Hivyo kitu chochote kutoka 0, 0, 0, 0, 0, 0 hadi F, F, F, F, F, F ni halali. 949 00:46:35,660 --> 00:46:39,550 Ni baadhi ya rangi halali ambayo inaweza kuonyeshwa na browser yako. 950 00:46:39,550 --> 00:46:39,790 Swali? 951 00:46:39,790 --> 00:46:43,590 >> Watazamaji: Nini tofauti kati ya kutumia kwa ID na kwa darasa? 952 00:46:43,590 --> 00:46:46,470 >> ANGELA li: swali ni nini tofauti kati ya 953 00:46:46,470 --> 00:46:48,950 kutumia kwa ID na darasa? 954 00:46:48,950 --> 00:46:54,390 Unaweza kuwa tu na hiki moja katika HTML hati ambayo ina ID huo. 955 00:46:54,390 --> 00:46:58,660 Jambo moja hivyo tu kwenye ukurasa wangu anaruhusiwa kuwa ID kuu. 956 00:46:58,660 --> 00:47:02,580 Hivyo kuitumia kwa ajili ya hii ni header. 957 00:47:02,580 --> 00:47:03,850 Hii ni navigation. 958 00:47:03,850 --> 00:47:05,230 Hii ni footer. 959 00:47:05,230 --> 00:47:09,070 Madarasa ni tofauti, kwa sababu unaweza kuomba madarasa ya HTML mambo kama wengi 960 00:47:09,070 --> 00:47:10,100 kama unataka. 961 00:47:10,100 --> 00:47:15,860 >> Hivyo kwa mfano, mimi sehemu darasa, kwa sababu kuna pengine zaidi ya moja 962 00:47:15,860 --> 00:47:17,540 sehemu ya ukurasa wangu. 963 00:47:17,540 --> 00:47:20,200 Wewe tu kuruhusiwa kuwa kama wengi mambo juu ya ukurasa kwa moja 964 00:47:20,200 --> 00:47:23,190 darasa lakini moja tu kwa ID fulani. 965 00:47:23,190 --> 00:47:25,600 >> Watazamaji: Kwa hiyo dot inawakilisha darasa? 966 00:47:25,600 --> 00:47:26,090 >> ANGELA li: Yeah. 967 00:47:26,090 --> 00:47:27,380 dot inawakilisha darasa. 968 00:47:27,380 --> 00:47:29,990 969 00:47:29,990 --> 00:47:31,540 Baridi. 970 00:47:31,540 --> 00:47:32,370 Hayo ni yote Mimi nimepata, guys. 971 00:47:32,370 --> 00:47:33,544 Asante. 972 00:47:33,544 --> 00:48:13,380 >> [Makofi] 973 00:48:13,380 --> 00:48:14,290 >> ZAMYLA CHAN: Hi, kila mtu. 974 00:48:14,290 --> 00:48:14,880 Mimi nina Zamyla. 975 00:48:14,880 --> 00:48:18,830 Mimi nina kwenda kuwa kufunika PHP, MVC, na SQL leo. 976 00:48:18,830 --> 00:48:22,350 977 00:48:22,350 --> 00:48:26,110 mengi ya vifaa kwamba mimi itakuwa kufunika ni kwenda kuwa pretty much 978 00:48:26,110 --> 00:48:29,100 haki nje ya pset7. 979 00:48:29,100 --> 00:48:29,700 Sawa. 980 00:48:29,700 --> 00:48:31,180 Kwa hiyo kile ni PHP? 981 00:48:31,180 --> 00:48:35,150 PHP anasimama kwa PHP HyperText Preprocessor. 982 00:48:35,150 --> 00:48:38,740 Hivyo, katika yenyewe, ni kujirudia jina, ambayo ni pretty cool. 983 00:48:38,740 --> 00:48:42,220 PHP ni server-upande lugha scripting, na hutoa backend 984 00:48:42,220 --> 00:48:44,610 na nguzo mantiki ya tovuti yetu. 985 00:48:44,610 --> 00:48:48,520 >> Hivyo Angela aliongea mengi kuhusu HTML na CSS kwamba kufanya muundo 986 00:48:48,520 --> 00:48:49,530 wa tovuti. 987 00:48:49,530 --> 00:48:53,210 Lakini nini kama unataka mabadiliko ya kwamba maudhui ya dynamically au kama inatofautiana 988 00:48:53,210 --> 00:48:55,240 msingi mtumiaji au hali fulani? 989 00:48:55,240 --> 00:48:57,060 Hiyo ambapo PHP anakuja in 990 00:48:57,060 --> 00:49:02,610 Sasa, kwa kawaida, PHP inaweza kuchukua chache mistari chini ya kutekeleza kitu kimoja 991 00:49:02,610 --> 00:49:07,380 katika C. Hii ni kwa sababu PHP Hushughulikia kumbukumbu usimamizi kwa ajili ya programu, 992 00:49:07,380 --> 00:49:11,170 kinyume na sisi kuwa na malloc bure, mambo kama hayo. 993 00:49:11,170 --> 00:49:15,430 >> Lakini tangu PHP ni interpretive lugha, kawaida, inaweza kutekeleza 994 00:49:15,430 --> 00:49:19,540 polepole kidogo zaidi ya C, ambayo ni lugha ulioandaliwa. 995 00:49:19,540 --> 00:49:23,150 Kwa sababu sisi ni kusonga programu lugha, hebu tuangalie jinsi 996 00:49:23,150 --> 00:49:24,570 syntax itakuwa tofauti. 997 00:49:24,570 --> 00:49:28,770 Hebu kuwa makini sana si kwa kupata kuchanganyikiwa na hili. 998 00:49:28,770 --> 00:49:33,750 Hivyo, pamoja na PHP syntax, kama wewe ni upachikaji PHP yako ndani ya HTML 999 00:49:33,750 --> 00:49:40,430 faili au ndani. php file yenyewe, haja uambatanishe code katika wazi 1000 00:49:40,430 --> 00:49:45,270 PHP na vitambulisho kufungwa PHP kama ifuatavyo, kama juu ya screen. 1001 00:49:45,270 --> 00:49:46,660 >> Vigezo katika PHP. 1002 00:49:46,660 --> 00:49:51,490 Kila variable moja itaanza na $ Ishara na kufuatiwa na jina la 1003 00:49:51,490 --> 00:49:53,150 variable yako. 1004 00:49:53,150 --> 00:49:56,530 Sasa, vigezo katika PHP ni loosely typed, ambayo ina maana kwamba huna haja ya 1005 00:49:56,530 --> 00:50:00,030 zinaonyesha aina gani data ni wakati wewe ni kutangaza ni. 1006 00:50:00,030 --> 00:50:03,505 Hata hivyo, hii haina maana kwamba wao hawana aina yoyote wakati wote. 1007 00:50:03,505 --> 00:50:09,370 Basi, ikiwa mimi kutangaza kutofautiana na tu kuweka ni sawa na 1, na kisha mimi kutangaza 1008 00:50:09,370 --> 00:50:15,140 mwingine kutofautiana, kuweka sawa na "1," na kisha mtu mwingine 1.0, vizuri, 1009 00:50:15,140 --> 00:50:19,410 kulingana na aina ya usawa operators mimi kutumia, kama nataka kulinganisha 1010 00:50:19,410 --> 00:50:21,830 katika aina zote, kisha wao utakuwa sawa. 1011 00:50:21,830 --> 00:50:25,570 Lakini kama nataka kuhakikisha kwamba aina ni sawa, PHP bado anaweza kufanya 1012 00:50:25,570 --> 00:50:28,690 kwamba, hata kama sisi si zinaonyesha ni aina gani ni wakati sisi 1013 00:50:28,690 --> 00:50:31,170 kwanza kufanya faili. 1014 00:50:31,170 --> 00:50:33,990 >> Sasa, katika PHP, hata kama sisi ni byte juu kutoka programu 1015 00:50:33,990 --> 00:50:39,360 lugha kutoka C, bado tuna yetu muaminifu kama hali, kama hii. 1016 00:50:39,360 --> 00:50:43,270 Bado tuna wakati wetu tanzi, tu kama hii, ambapo wewe kuweka katika yako 1017 00:50:43,270 --> 00:50:47,300 hali na kisha mwili ya kitanzi. 1018 00:50:47,300 --> 00:50:50,360 Na kisha sisi pia kuwa yetu kwa kitanzi, ambayo kwa kawaida inaonekana kama hii. 1019 00:50:50,360 --> 00:50:55,330 Basi, ikiwa mimi alitaka iterate juu ya yote psets tisa na kuwasilisha na kuwaita 1020 00:50:55,330 --> 00:50:58,960 kazi submitPset, basi mimi anaweza kufanya hivyo hapa, ambayo guys kuwa wote 1021 00:50:58,960 --> 00:50:59,830 kufanyika kwa hatua hii. 1022 00:50:59,830 --> 00:51:01,080 Hongera, kwa njia. 1023 00:51:01,080 --> 00:51:04,560 1024 00:51:04,560 --> 00:51:07,550 >> Kwa kamera, watu akasema, asante. 1025 00:51:07,550 --> 00:51:11,220 Sasa, ikiwa hakutaka kutumia haki hii kwa kitanzi, kisha PHP kweli pia 1026 00:51:11,220 --> 00:51:13,580 ina mambo kuitwa foreach matanzi. 1027 00:51:13,580 --> 00:51:22,210 Basi, ikiwa mimi alikuwa na safu ya integers, 0 kwa njia ya 8, kuhifadhiwa katika psets safu, 1028 00:51:22,210 --> 00:51:27,290 kisha mimi naweza kuwa na foreach kitanzi kwamba iterates juu ya kila idadi katika psets. 1029 00:51:27,290 --> 00:51:30,640 Na kisha mimi naweza kuita sawa kazi mara nane, 1030 00:51:30,640 --> 00:51:31,910 tu kama mimi kabla ya. 1031 00:51:31,910 --> 00:51:36,480 Hivyo hii kwa kila kitanzi ni nzuri, kwa sababu huna na kama hamjui 1032 00:51:36,480 --> 00:51:39,470 urefu halisi ya safu kwamba kuwa, basi kwa kutumia kitanzi hii foreach 1033 00:51:39,470 --> 00:51:42,800 itachukua huduma ya kwamba kwa ajili yenu. 1034 00:51:42,800 --> 00:51:45,410 >> Hivyo mimi alifanya psets kama safu. 1035 00:51:45,410 --> 00:51:46,700 Hebu tuangalie hiyo. 1036 00:51:46,700 --> 00:51:51,290 Arrays katika PHP ni kawaida sawa na wale ambao tulikuwa na katika C, ambapo 1037 00:51:51,290 --> 00:51:52,960 unaweza kutangaza safu. 1038 00:51:52,960 --> 00:51:59,200 Na hapa, siwezi kutangaza safu tupu na kisha kujenga dynamically kwa kutumia 1039 00:51:59,200 --> 00:52:00,850 fahirisi kama integers. 1040 00:52:00,850 --> 00:52:04,140 Hivyo index 0, mimi nina kwenda kuhifadhi integer jina lake 1. 1041 00:52:04,140 --> 00:52:09,210 Katika index 1 ya orodha yangu, mimi nina kwenda kuhifadhi thamani 2. 1042 00:52:09,210 --> 00:52:12,670 Na saa tatu index lakini Idadi ya pili, mimi nina kwenda kwa 1043 00:52:12,670 --> 00:52:14,870 kuhifadhi namba 12. 1044 00:52:14,870 --> 00:52:17,250 >> Sasa, hii ni nzuri kwa kuwa kazi ni kazi vizuri. 1045 00:52:17,250 --> 00:52:21,310 Lakini kusema ni mambo kwangu nini kila index ana. 1046 00:52:21,310 --> 00:52:24,500 Kwangu mimi, index 0 maana jinsi paka wengi mimi. 1047 00:52:24,500 --> 00:52:27,400 Na index 1 maana jinsi bundi wengi mimi. 1048 00:52:27,400 --> 00:52:29,450 Na moja ijayo maana mbwa wangapi. 1049 00:52:29,450 --> 00:52:34,140 Vizuri, basi ni kwa bayana kwamba, badala ya kuwa na kukumbuka 0 inahusiana na 1050 00:52:34,140 --> 00:52:38,090 paka na 1 kwa bundi, naweza kutumia arrays associative, ambayo ina maana kwamba 1051 00:52:38,090 --> 00:52:42,260 badala ya integers kama fahirisi yangu, Mimi unaweza kweli kutumia masharti. 1052 00:52:42,260 --> 00:52:43,290 >> Hivyo hii ni muhimu kabisa. 1053 00:52:43,290 --> 00:52:47,130 Na umefanya kimsingi tu kubadilishwa integers kwa masharti. 1054 00:52:47,130 --> 00:52:50,074 Na kuna una associative safu. 1055 00:52:50,074 --> 00:52:51,930 Yeah. 1056 00:52:51,930 --> 00:52:55,800 >> Watazamaji: Je, kuna sababu kwa nini kuna kusisitiza kwa ajili ya pili 1057 00:52:55,800 --> 00:52:58,750 sehemu, kwa sababu orodha yangu ina safu. 1058 00:52:58,750 --> 00:53:01,330 >> ZAMYLA CHAN: Swali ni kuwa, ni kuna sababu kwa nini kuna 1059 00:53:01,330 --> 00:53:03,320 kusisitiza kati ya yangu na orodha? 1060 00:53:03,320 --> 00:53:03,610 Hapana 1061 00:53:03,610 --> 00:53:06,878 Hiyo tu jinsi mimi nina kutaja variable yangu. 1062 00:53:06,878 --> 00:53:11,670 >> Watazamaji: On kwanza line, ni neno moja. 1063 00:53:11,670 --> 00:53:12,560 >> ZAMYLA CHAN: msamaha wangu. 1064 00:53:12,560 --> 00:53:13,410 Mimi itabidi kurekebisha hiyo. 1065 00:53:13,410 --> 00:53:13,620 Yeah. 1066 00:53:13,620 --> 00:53:15,460 Lazima wao jina moja kutofautiana. 1067 00:53:15,460 --> 00:53:16,710 Nzuri samaki. 1068 00:53:16,710 --> 00:53:19,640 1069 00:53:19,640 --> 00:53:19,950 OK. 1070 00:53:19,950 --> 00:53:22,610 Hivyo basi hoja juu ya kamba concatenation. 1071 00:53:22,610 --> 00:53:27,500 Kama nilitaka kuchukua masharti mawili, basi naweza concatenate yao 1072 00:53:27,500 --> 00:53:28,550 na dot operator. 1073 00:53:28,550 --> 00:53:32,440 Basi, ikiwa mimi na Milo kama jina la kwanza na Banana kama jina la mwisho, kisha 1074 00:53:32,440 --> 00:53:35,430 concatenating na dot operator na kisha kuweka nafasi katika kati ya 1075 00:53:35,430 --> 00:53:39,210 itafanya kamba ambayo ina Milo Banana, ambayo siwezi kisha echo au, 1076 00:53:39,210 --> 00:53:41,280 badala yake, magazeti nje. 1077 00:53:41,280 --> 00:53:44,465 >> Akizungumza ya echo, hebu majadiliano kuhusu muhimu wachache - 1078 00:53:44,465 --> 00:53:44,920 oops. 1079 00:53:44,920 --> 00:53:46,030 Mimi nina sorry. 1080 00:53:46,030 --> 00:53:52,920 chache muhimu PHP kazi. 1081 00:53:52,920 --> 00:53:56,240 Hivyo tuna - 1082 00:53:56,240 --> 00:53:57,444 matatizo ya kiufundi. 1083 00:53:57,444 --> 00:53:58,694 Moja ya pili. 1084 00:53:58,694 --> 00:54:16,960 1085 00:54:16,960 --> 00:54:19,550 Mimi Wajumbe. 1086 00:54:19,550 --> 00:54:22,320 PowerPoint matatizo. 1087 00:54:22,320 --> 00:54:29,200 Na sisi ni nyuma na kazi PHP. 1088 00:54:29,200 --> 00:54:32,010 1089 00:54:32,010 --> 00:54:35,150 Na sisi ni nyuma na kazi PHP. 1090 00:54:35,150 --> 00:54:39,890 >> Hivyo tuna zinahitaji kazi, ambapo kama wewe kupita katika file, hapa ni tu 1091 00:54:39,890 --> 00:54:43,300 mfano wa faili kwamba Nipate kupita in 1092 00:54:43,300 --> 00:54:47,605 Basi hiyo itakuwa ni pamoja na PHP code na kwamba faili kwamba mimi zinaonyesha. 1093 00:54:47,605 --> 00:54:49,940 Na itakuwa kutathmini kwamba in 1094 00:54:49,940 --> 00:54:54,450 Kisha sisi pia kuwa echo, ambayo ni sambamba na printf. 1095 00:54:54,450 --> 00:54:57,710 Toka ni sambamba na kuvunja, ambayo exits ya kuzuia wa 1096 00:54:57,710 --> 00:54:58,570 kificho kwamba wewe ni in 1097 00:54:58,570 --> 00:55:03,180 Na kisha hundi tupu kama kupewa kutofautiana ni kama null au sifuri au 1098 00:55:03,180 --> 00:55:08,482 chochote ni sawa na kuwa tupu. 1099 00:55:08,482 --> 00:55:09,438 Yeah. 1100 00:55:09,438 --> 00:55:15,341 >> Watazamaji: Kwa kamba concatenation dot operator moja, katika PHP, ni kwamba 1101 00:55:15,341 --> 00:55:20,158 sawa katika JavaScript ambapo ni kutumia dot kwa concatenation maana pamoja na? 1102 00:55:20,158 --> 00:55:27,440 Hivyo kwa jina kamili, unaweza kuwa na dola ishara ya kwanza + na kisha + mara ya mwisho? 1103 00:55:27,440 --> 00:55:27,720 >> ZAMYLA CHAN: Yeah. 1104 00:55:27,720 --> 00:55:32,150 Hivyo swali lilikuwa kama katika PHP sisi unaweza kutumia moja string concatenation 1105 00:55:32,150 --> 00:55:33,890 kama katika JavaScript na pluses. 1106 00:55:33,890 --> 00:55:35,410 Na Joseph kupata ndani ya baadaye. 1107 00:55:35,410 --> 00:55:36,620 Nadhani ana slide juu ya hilo. 1108 00:55:36,620 --> 00:55:37,570 Kwa kweli, ni tofauti. 1109 00:55:37,570 --> 00:55:41,310 Hivyo katika JavaScript, unahitaji kutumia pamoja na kwa concatenate masharti. 1110 00:55:41,310 --> 00:55:43,280 Na katika PHP, una kutumia dot operator. 1111 00:55:43,280 --> 00:55:44,530 Hivyo ni tofauti. 1112 00:55:44,530 --> 00:55:46,680 1113 00:55:46,680 --> 00:55:46,910 >> OK. 1114 00:55:46,910 --> 00:55:49,500 Hivyo sasa kwamba tumekuwa kufunikwa wote PHP hii, ambapo gani 1115 00:55:49,500 --> 00:55:50,490 kweli kuja katika Handy? 1116 00:55:50,490 --> 00:55:54,470 Naam, ni huja katika Handy wakati sisi unaweza kuchanganya ni pamoja na HTML yetu. 1117 00:55:54,470 --> 00:55:59,550 Hivyo PHP yetu kutupa nguvu kwa kubadilisha ukurasa wa HTML maudhui ya kabla ya 1118 00:55:59,550 --> 00:56:00,000 upakiaji yake. 1119 00:56:00,000 --> 00:56:04,270 Hivyo kulingana na hali tofauti, kawaida user maalum kwamba 1120 00:56:04,270 --> 00:56:07,520 watumiaji katika, tunaweza kuonyesha taarifa mbalimbali. 1121 00:56:07,520 --> 00:56:08,800 Linda, je, una swali? 1122 00:56:08,800 --> 00:56:15,510 >> Watazamaji: Je, unaweza concatenate integer pia? 1123 00:56:15,510 --> 00:56:16,760 >> ZAMYLA CHAN: Ndiyo, unaweza. 1124 00:56:16,760 --> 00:56:19,530 1125 00:56:19,530 --> 00:56:23,270 Hivyo swali kama unaweza concatenate integers au nyingine 1126 00:56:23,270 --> 00:56:28,920 variable.s sasa, sisi kuendelea na MVC, ambayo ni dhana kwamba sisi kutumika katika 1127 00:56:28,920 --> 00:56:33,380 pset7 na mengi ya mtandao wabunifu kutumia kwa kuandaa code katika files 1128 00:56:33,380 --> 00:56:34,490 katika tovuti yao. 1129 00:56:34,490 --> 00:56:35,870 M anasimama kwa Model. 1130 00:56:35,870 --> 00:56:41,450 Na kimsingi, files mfano atapambana na mwingiliano na database. 1131 00:56:41,450 --> 00:56:44,640 Kuona files, kuhusiana na aesthetics wa tovuti. 1132 00:56:44,640 --> 00:56:47,550 Na Mdhibiti Hushughulikia maombi user, parses 1133 00:56:47,550 --> 00:56:49,230 data, je, mantiki nyingine. 1134 00:56:49,230 --> 00:56:52,520 >> Katika pset7, sisi pamoja na mfano na mtawala. 1135 00:56:52,520 --> 00:56:55,880 Na sisi tu kuitwa controllers yao na kuziweka katika orodha ya umma. 1136 00:56:55,880 --> 00:57:01,730 Na mtazamo files, sisi matumizi yao kama templates katika templates directory. 1137 00:57:01,730 --> 00:57:07,260 Hivyo mchoro huu hapa pia inawakilisha watu wa aina hiyo mgawanyiko na 1138 00:57:07,260 --> 00:57:10,510 mfano wa kuigwa na mtawala katika zambarau hapa upande wa kushoto na 1139 00:57:10,510 --> 00:57:12,770 maoni juu ya haki. 1140 00:57:12,770 --> 00:57:16,020 Hivyo hii ni schematic kwamba baadhi yenu tumeona katika Ofisi ya masaa au 1141 00:57:16,020 --> 00:57:19,130 michoro kuwa tulikuwa kuchora kama wewe walikuwa kuhesabia pset yako. 1142 00:57:19,130 --> 00:57:25,030 >> Hivyo hapa, katika mtawala fulani, mfano mtawala, tuna kazi 1143 00:57:25,030 --> 00:57:30,490 ambayo yanahusiana na querying SQL database, utekelezaji wa PHP mantiki. 1144 00:57:30,490 --> 00:57:32,370 Labda bila kuangalia up biashara katika Yahoo! 1145 00:57:32,370 --> 00:57:34,590 Fedha. 1146 00:57:34,590 --> 00:57:37,390 Au labda, ungekuwa kuangalia tu kwa kuona kama mtumiaji alikuwa in 1147 00:57:37,390 --> 00:57:40,250 kuunda tayari kabla ya kuwa na alitembelea ukurasa wako. 1148 00:57:40,250 --> 00:57:43,390 Na kisha litafanya a kuunda zaidi ya hapa. 1149 00:57:43,390 --> 00:57:48,210 Baada ya fomu ambayo yamekuwa in kwa mtumiaji, hatua ambayo ilikuwa 1150 00:57:48,210 --> 00:57:53,470 maalum katika fomu ya HTML tag ingekuwa zinaonyesha ukurasa kwamba 1151 00:57:53,470 --> 00:57:55,620 anarudi data kwamba. 1152 00:57:55,620 --> 00:57:59,460 >> Hivyo wote wa habari kwamba itakuwa kurejea kwa mtawala yako. 1153 00:57:59,460 --> 00:58:02,620 Basi pengine kufanya kidogo zaidi mantiki juu ya kuwa na labda nitafanya chache 1154 00:58:02,620 --> 00:58:06,510 maswali zaidi katika SQL database na kisha, mwisho, kuja na nicely 1155 00:58:06,510 --> 00:58:11,930 Zikiwa seti ya habari kuwa wewe kupita katika katika baadhi ya template nyingine 1156 00:58:11,930 --> 00:58:13,950 kwamba kuonyeshwa kwamba habari. 1157 00:58:13,950 --> 00:58:17,030 Sasa, ni jinsi gani sisi kweli mfuko kwamba taarifa up? 1158 00:58:17,030 --> 00:58:23,980 Vizuri, tuna kazi kuitwa Mpeni kwamba alikuwa katika functions.php file katika 1159 00:58:23,980 --> 00:58:29,950 pset7, ambapo kupita katika jina la file, jina la template. 1160 00:58:29,950 --> 00:58:32,160 >> Na kisha pia kupita katika associative safu. 1161 00:58:32,160 --> 00:58:37,150 Na ili safu associative inawakilisha taarifa mbalimbali 1162 00:58:37,150 --> 00:58:39,040 kwamba unataka kupita in 1163 00:58:39,040 --> 00:58:43,460 Sasa, nini kinaendelea kuwa mara kwa mara katika mifano hii ni kwamba funguo au, 1164 00:58:43,460 --> 00:58:47,070 badala yake, funguo za associative arrays, wale ni nini kinaendelea kuwa 1165 00:58:47,070 --> 00:58:51,050 inatarajiwa kuwa mara kwa mara na template, kwa sababu anajua mahitaji 1166 00:58:51,050 --> 00:58:53,990 kitu kinachoitwa ujumbe au kuitwa jina. 1167 00:58:53,990 --> 00:58:56,940 Na kisha mambo juu ya haki, maadili halisi, hivyo katika kesi hii, ambaye ni 1168 00:58:56,940 --> 00:59:00,750 mtoto mzuri na Milo, wale ni kwenda kuwa na maadili ambayo ni kubadilisha 1169 00:59:00,750 --> 00:59:05,610 kwamba mtawala mabadiliko ya kila wakati au kulingana na hali fulani na 1170 00:59:05,610 --> 00:59:07,120 itapita kwamba in 1171 00:59:07,120 --> 00:59:12,790 >> Hivyo hapa katika templates, tunaona kwamba ni kutumia HTML herufi maalum, 1172 00:59:12,790 --> 00:59:16,370 ambayo tu kimsingi ina maana kwamba tunataka kupata kamba rika kwamba 1173 00:59:16,370 --> 00:59:17,580 user kuweka in 1174 00:59:17,580 --> 00:59:20,880 Na tunataka mbadala ujumbe huko. 1175 00:59:20,880 --> 00:59:26,110 Hivyo basi wakati sisi kweli kuona file, maalum 1176 00:59:26,110 --> 00:59:28,700 habari ni kupita in 1177 00:59:28,700 --> 00:59:33,850 Kumbuka kwamba muhimu jinsi atatoa kazi ni kwamba funguo za associative 1178 00:59:33,850 --> 00:59:37,170 arrays, wale variable kuwa majina hapa. 1179 00:59:37,170 --> 00:59:40,720 Na hivyo maadili ya kuwa muhimu katika associative safu basi inakuwa 1180 00:59:40,720 --> 00:59:41,970 thamani ya kutofautiana. 1181 00:59:41,970 --> 00:59:44,800 1182 00:59:44,800 --> 00:59:46,040 >> Sasa, hebu kuendelea na SQL. 1183 00:59:46,040 --> 00:59:48,010 Anasimama kwa Strukturerad Swala lugha. 1184 00:59:48,010 --> 00:59:50,460 Na hivyo hii ni programu lugha iliyoundwa 1185 00:59:50,460 --> 00:59:51,880 kwa ajili ya kusimamia database. 1186 00:59:51,880 --> 00:59:56,860 Na alikuja katika Handy kwa ajili yetu katika yetu pset7 fedha tovuti. 1187 00:59:56,860 --> 01:00:00,510 Kimsingi, ni njia tu rahisi kwa kufuatilia na kusimamia vitu na meza 1188 01:00:00,510 --> 01:00:02,070 na kiungo wao kwa kila mmoja. 1189 01:00:02,070 --> 01:00:06,860 Sasa, kufikiria SQL Mbegu yako kimsingi kama Excel file, pengine, 1190 01:00:06,860 --> 01:00:10,040 pamoja na karatasi nyingi tabbed. 1191 01:00:10,040 --> 01:00:13,820 >> Hivyo unaweza kuwa na meza nyingi, pengine, kwamba wanaohusishwa na mtu mwingine. 1192 01:00:13,820 --> 01:00:19,420 Na mengi kama Excel, tuna mengi ya utendaji kwamba tunataka. 1193 01:00:19,420 --> 01:00:22,300 Kwa mfano, tunaweza kuchagua baadhi ya mistari. 1194 01:00:22,300 --> 01:00:24,110 Tunaweza kuingiza habari. 1195 01:00:24,110 --> 01:00:25,560 Tunaweza kuboresha safu. 1196 01:00:25,560 --> 01:00:27,440 Na tunaweza pia kufuta mambo. 1197 01:00:27,440 --> 01:00:30,920 1198 01:00:30,920 --> 01:00:36,560 >> SQL kuchagua kazi kwa kuchagua safu au safu ya nguzo fulani kutoka 1199 01:00:36,560 --> 01:00:39,640 database wanaofanana na baadhi ya vigezo kwamba zinaonyesha. 1200 01:00:39,640 --> 01:00:44,930 Hivyo juu ya hapa wakati mimi kuona kuchagua * kutoka wachawi ambapo nyumba = Ravenclaw, basi 1201 01:00:44,930 --> 01:00:48,340 Mimi nina kuchagua *, ambayo ina maana mimi nina kuchagua kila safu moja katika 1202 01:00:48,340 --> 01:00:56,340 mstari kutoka wachawi meza lakini tu kama safu nyumba sawa na Ravenclaw. 1203 01:00:56,340 --> 01:00:57,840 Sasa, hii ni safi au SQL. 1204 01:00:57,840 --> 01:01:02,680 Hivyo kama nilikwenda PHPmyadmin, ambayo ni njia maalum kwamba sisi kutumia ili kusimamia 1205 01:01:02,680 --> 01:01:07,040 database yetu SQL, basi mimi naweza kuingiza kwamba katika tovuti PHPmyadmin. 1206 01:01:07,040 --> 01:01:08,290 Na kwamba itakuwa nitafanya. 1207 01:01:08,290 --> 01:01:11,280 >> Lakini sisi kweli wanataka kufanya kuwa upande PHP. 1208 01:01:11,280 --> 01:01:12,580 Hivyo ni jinsi gani sisi kufanya hivyo? 1209 01:01:12,580 --> 01:01:20,180 Naam, sisi kutumia swala kazi, ambayo kimsingi executes kwamba SQL query. 1210 01:01:20,180 --> 01:01:21,830 Kutumia? 1211 01:01:21,830 --> 01:01:25,850 kama placeholder, tunaweza kupita katika baadhi ya maadili kwa kamba yetu kwamba sisi 1212 01:01:25,850 --> 01:01:26,920 wanataka nafasi. 1213 01:01:26,920 --> 01:01:32,110 Hivyo labda mimi nina kuhifadhi mbalimbali maadili katika curr_house, ambayo 1214 01:01:32,110 --> 01:01:34,400 inawakilisha nyumba sasa kwamba mimi nina kwenda kwa. 1215 01:01:34,400 --> 01:01:39,040 Hivyo siwezi kupita kwamba katika kama placeholder na alama ya swali. 1216 01:01:39,040 --> 01:01:43,290 Na basi mimi itabidi kimsingi kutekeleza kitu kimoja kama nilivyokwisha waonya kabla, ila 1217 01:01:43,290 --> 01:01:45,550 sasa, mimi nina katika PHP. 1218 01:01:45,550 --> 01:01:51,300 >> Na swala atarudi associative safu. 1219 01:01:51,300 --> 01:01:53,470 Na mimi nina kwenda kuhifadhi katika safu. 1220 01:01:53,470 --> 01:01:56,880 Sasa, swala anaweza daima kushindwa. 1221 01:01:56,880 --> 01:02:02,870 Labda SQL swala hakuweza kutekeleza kwa sababu meza hayupo. 1222 01:02:02,870 --> 01:02:04,310 Au labda, safu hayupo. 1223 01:02:04,310 --> 01:02:05,400 Kitu potoka. 1224 01:02:05,400 --> 01:02:08,170 Naam, katika kesi hiyo, utasikia wanataka kufanya kuhakikisha kwamba kuangalia kama 1225 01:02:08,170 --> 01:02:09,700 swala akarudi uongo. 1226 01:02:09,700 --> 01:02:15,590 Na kwamba ni kwa kutumia mara tatu sawa na kazi huko. 1227 01:02:15,590 --> 01:02:19,660 >> Na kisha mimi kuomba msamaha, ambayo ni mwingine CS50 kazi, kupita katika ujumbe. 1228 01:02:19,660 --> 01:02:23,435 Na kama ukiangalia katika kuomba msamaha, wote ni kweli gani ni kutoa apology.php. 1229 01:02:23,435 --> 01:02:26,100 1230 01:02:26,100 --> 01:02:26,410 Yeah. 1231 01:02:26,410 --> 01:02:29,630 >> Watazamaji: Unaweza kuelezea kile ambacho nyota gani kati ya kuchagua na kutoka? 1232 01:02:29,630 --> 01:02:30,710 >> ZAMYLA CHAN: Yeah, kabisa. 1233 01:02:30,710 --> 01:02:35,220 Hivyo nyota katika kati ya kuchagua na kutoka ina maana kwamba mimi unataka kuchagua zima 1234 01:02:35,220 --> 01:02:37,440 nzima mstari kutoka meza yangu. 1235 01:02:37,440 --> 01:02:41,900 Mimi nilikuwa ve unahitajika kuchagua jina, mwaka, nyumba. 1236 01:02:41,900 --> 01:02:46,160 Na napenda tu kupata wale tatu nguzo katika meza yangu. 1237 01:02:46,160 --> 01:02:51,560 Lakini kama mimi kusema kuchagua *, basi mimi itabidi kupata kila kitu katika safu hiyo. 1238 01:02:51,560 --> 01:02:53,760 Kisha mimi nina kwenda ninyi katika nyuma ya kwanza. 1239 01:02:53,760 --> 01:02:57,656 >> Watazamaji: Hivyo hii ni bado katika SQL, sawa? 1240 01:02:57,656 --> 01:02:59,610 Ni swala hii au ni PHP hii? 1241 01:02:59,610 --> 01:03:00,550 >> ZAMYLA CHAN: Tuko katika swala. 1242 01:03:00,550 --> 01:03:01,940 Hivyo hii ni katika PHP. 1243 01:03:01,940 --> 01:03:06,280 Hivyo kwa kutumia PHP kazi swala, sisi ni utekelezaji wa SQL query. 1244 01:03:06,280 --> 01:03:11,988 1245 01:03:11,988 --> 01:03:15,364 >> Watazamaji: Je, kitu chochote katika SQL kesi nyeti, kama kuchagua 1246 01:03:15,364 --> 01:03:17,834 au wachawi au nyumba? 1247 01:03:17,834 --> 01:03:20,050 >> ZAMYLA CHAN: Je, kitu chochote katika SQL kesi nyeti? 1248 01:03:20,050 --> 01:03:21,760 Naamini hivyo, ndiyo. 1249 01:03:21,760 --> 01:03:24,620 Naamini kuwa CHAGUA na kutoka na WAPI ni suala nyeti. 1250 01:03:24,620 --> 01:03:25,535 No? 1251 01:03:25,535 --> 01:03:27,500 >> Rob BOWDEN: Kwa hiyo, ni kinyume. 1252 01:03:27,500 --> 01:03:32,030 majina safu na njia meza, wale wote ni suala nyeti. 1253 01:03:32,030 --> 01:03:35,470 Lakini yoyote ya MySQL muhimu maneno, kama CHAGUA, kutoka, na wapi, hao si 1254 01:03:35,470 --> 01:03:36,140 kesi nyeti. 1255 01:03:36,140 --> 01:03:36,420 OK. 1256 01:03:36,420 --> 01:03:37,780 Hivyo kinyume cha kile alisema. 1257 01:03:37,780 --> 01:03:40,420 Basi wote wa maneno MySQL - 1258 01:03:40,420 --> 01:03:42,670 kuchagua, kutoka, ambapo - wale ni si suala nyeti. 1259 01:03:42,670 --> 01:03:44,630 Lakini kila kitu kingine ni. 1260 01:03:44,630 --> 01:03:45,210 OK. 1261 01:03:45,210 --> 01:03:46,500 Wewe mbele. 1262 01:03:46,500 --> 01:03:52,041 >> Watazamaji: Kama mimi na $ safu katika suala la mstari zaidi ya moja, haina maana kuwa ni 1263 01:03:52,041 --> 01:03:53,640 tu inakuwa safu associative? 1264 01:03:53,640 --> 01:03:59,550 >> ZAMYLA CHAN: Kwa hiyo swali ilikuwa kama safu ina mstari zaidi ya moja ndani yake, haina 1265 01:03:59,550 --> 01:04:01,800 ni kuwa safu associative? 1266 01:04:01,800 --> 01:04:05,680 Hivyo ni safu ya associative arrays tayari. 1267 01:04:05,680 --> 01:04:10,730 Hivyo hata kama kuna mstari mmoja tu kurudishwa, basi utaweza kwenda 1268 01:04:10,730 --> 01:04:12,690 index 0 wa matokeo. 1269 01:04:12,690 --> 01:04:15,316 Na kisha wewe d na kwamba safu ya kwanza. 1270 01:04:15,316 --> 01:04:17,482 Ndiyo, Belinda? 1271 01:04:17,482 --> 01:04:21,258 >> Watazamaji: Wakati matumizi ya ===, ni hii mfano tu? 1272 01:04:21,258 --> 01:04:22,210 Au kuna watu wengine? 1273 01:04:22,210 --> 01:04:26,815 >> ZAMYLA CHAN: Hivyo katika kesi hii, === ni kulinganisha katika aina. 1274 01:04:26,815 --> 01:04:29,870 1275 01:04:29,870 --> 01:04:34,050 Sorry. === Ni kulinganisha ambayo inalinganishwa aina. 1276 01:04:34,050 --> 01:04:37,620 Na kisha == kulinganisha na katika aina zote. 1277 01:04:37,620 --> 01:04:41,620 >> Watazamaji: Je, unaweza kueleza nini safu ni katika hali hii? 1278 01:04:41,620 --> 01:04:45,120 Je, ni mstari wa data? 1279 01:04:45,120 --> 01:04:48,100 >> ZAMYLA CHAN: Katika slide ya pili, mimi nina kwenda kueleza kile safu ni. 1280 01:04:48,100 --> 01:04:49,890 Hivyo kama huna akili kufanya mbali juu ya hilo. 1281 01:04:49,890 --> 01:04:50,620 Na kisha katika nyuma? 1282 01:04:50,620 --> 01:04:54,699 >> Watazamaji: Kwa kazi kama swala, kutoa na kuomba msamaha [inaudible]? 1283 01:04:54,699 --> 01:04:59,050 1284 01:04:59,050 --> 01:05:03,050 >> ZAMYLA CHAN: swali lilikuwa kama kazi hizi - swala, kuomba msamaha, 1285 01:05:03,050 --> 01:05:04,510 na kutoa - 1286 01:05:04,510 --> 01:05:05,930 ni ya kawaida katika PHP. 1287 01:05:05,930 --> 01:05:09,460 Hao ndio wale CS50 aliandika kwa ajili ya pset7. 1288 01:05:09,460 --> 01:05:09,910 Na Jay? 1289 01:05:09,910 --> 01:05:15,333 >> Watazamaji: Wakati unahitaji kusema $ _session, Ni kwamba tu kwa vitambulisho? 1290 01:05:15,333 --> 01:05:17,310 Au unaweza kuwa alisema kwamba hapa? 1291 01:05:17,310 --> 01:05:23,440 >> ZAMYLA CHAN: Kwa hiyo swali mara, wakati sisi kutumia $ _session, kwamba ilikuwa maalum 1292 01:05:23,440 --> 01:05:25,290 variable kimataifa kwamba sisi ni kutumia. 1293 01:05:25,290 --> 01:05:32,080 Hapa variable hii ni ya kwenda kuwa ndani kwa kazi yetu. 1294 01:05:32,080 --> 01:05:36,588 Hivyo sisi ni kutangaza tu variable mpya. 1295 01:05:36,588 --> 01:05:38,460 >> Watazamaji: Ni jinsi gani msamaha kutekelezwa? 1296 01:05:38,460 --> 01:05:40,960 >> ZAMYLA CHAN: Swali ni kuwa, ni jinsi gani msamaha kutekelezwa? 1297 01:05:40,960 --> 01:05:44,180 Na nadhani hii ni kweli pretty mazoezi mazuri kwa nyie kwenda katika 1298 01:05:44,180 --> 01:05:49,260 functions.php sehemu na kuangalia kuomba msamaha na kuona ni jinsi gani unaweza kuwa na 1299 01:05:49,260 --> 01:05:50,670 amefanya hivyo mwenyewe. 1300 01:05:50,670 --> 01:05:55,620 Ili nipate kuondoka kuwa na wewe lakini tu kusema kwamba kama ukiangalia kuomba msamaha, 1301 01:05:55,620 --> 01:06:02,110 kisha inachukua ujumbe kwamba kuwasilishwa kwa msamaha, na kisha 1302 01:06:02,110 --> 01:06:06,570 mithili ya ujumbe huo. 1303 01:06:06,570 --> 01:06:08,240 Yoyote maswali zaidi? 1304 01:06:08,240 --> 01:06:08,710 Nampenda maswali. 1305 01:06:08,710 --> 01:06:09,555 Hivyo kuwaweka ijayo. 1306 01:06:09,555 --> 01:06:11,888 >> Watazamaji: [inaudible] 1307 01:06:11,888 --> 01:06:13,840 echo au magazeti huko? 1308 01:06:13,840 --> 01:06:15,900 >> ZAMYLA CHAN: Swali ni kuwa, tunaweza si tu kuweka 1309 01:06:15,900 --> 01:06:17,000 echo au magazeti huko. 1310 01:06:17,000 --> 01:06:19,710 Hivyo kwamba ingekuwa amefanya kitu tofauti kidogo. 1311 01:06:19,710 --> 01:06:23,750 Hiyo ingekuwa kuchapishwa swala alishindwa katika kuwa - 1312 01:06:23,750 --> 01:06:27,420 vizuri, sasa hivi, sisi ni kweli katika mtawala wetu. 1313 01:06:27,420 --> 01:06:30,350 Kwa hiyo sisi si kweli kuwa HTML kuanzisha hapa. 1314 01:06:30,350 --> 01:06:34,946 Kuomba msamaha na utoaji apologize.php kweli maelekezo wewe apology.php. 1315 01:06:34,946 --> 01:06:39,560 1316 01:06:39,560 --> 01:06:42,200 OK. 1317 01:06:42,200 --> 01:06:45,880 >> Hivyo sasa, hebu kwenda juu ya kushughulikia swali kutoka mapema juu ya nini 1318 01:06:45,880 --> 01:06:47,330 kweli ni safu. 1319 01:06:47,330 --> 01:06:51,960 Naam, swala atarudi safu ya mistari. 1320 01:06:51,960 --> 01:06:55,020 Na kila mstari ni kuwakilishwa na safu associative. 1321 01:06:55,020 --> 01:07:02,840 Hivyo kama nimekuwa kunyongwa baadhi swala SQL na Nimekuwa kuhifadhiwa matokeo katika safu, basi 1322 01:07:02,840 --> 01:07:07,850 kutumia foreach kitanzi, kisha safu jina ni moja ya kwanza huko - safu. 1323 01:07:07,850 --> 01:07:13,170 Na basi mimi nina kwenda kuwaita kila mstari katika huko mstari $. 1324 01:07:13,170 --> 01:07:20,060 >> Hivyo iterating juu ya kwamba, siwezi kisha kupata mstari kutokana na jina la safu, 1325 01:07:20,060 --> 01:07:22,340 mwaka safu, na nyumba safu. 1326 01:07:22,340 --> 01:07:28,010 Kumbuka kwamba mimi bila kuwa na uwezo wa kufanya hivyo kwa safu, kwa sababu safu index 1327 01:07:28,010 --> 01:07:29,290 jina haipo. 1328 01:07:29,290 --> 01:07:31,970 Safu ni safu ya associative arrays. 1329 01:07:31,970 --> 01:07:34,870 Hivyo kuwa na ngazi mbili huko. 1330 01:07:34,870 --> 01:07:37,170 Mara baada ya kuwa safu ya mistari, una kupata ndani ya hiyo. 1331 01:07:37,170 --> 01:07:39,110 Na basi unaweza kupata nguzo. 1332 01:07:39,110 --> 01:07:41,636 Je, kwamba kufanya hivyo ni wazi? 1333 01:07:41,636 --> 01:07:42,520 Yeah, mbele? 1334 01:07:42,520 --> 01:07:45,490 >> Watazamaji: [inaudible] kufungua mabano kwa [inaudible]? 1335 01:07:45,490 --> 01:07:46,220 >> ZAMYLA CHAN: Msamaha mimi? 1336 01:07:46,220 --> 01:07:49,740 >> Watazamaji: mabano wazi. 1337 01:07:49,740 --> 01:07:52,420 >> ZAMYLA CHAN: Hizi hapa? 1338 01:07:52,420 --> 01:07:58,520 Hiyo kuniruhusu ni pamoja na kwamba kutofautiana. 1339 01:07:58,520 --> 01:07:58,670 Yeah. 1340 01:07:58,670 --> 01:08:01,900 >> Watazamaji: Wakati magazeti, wewe ni uchapishaji kwa HTML code? 1341 01:08:01,900 --> 01:08:03,110 >> ZAMYLA CHAN: Ndiyo. 1342 01:08:03,110 --> 01:08:07,720 Wakati mimi magazeti, hii hapa ni ndani ya template yangu sasa, hivyo 1343 01:08:07,720 --> 01:08:10,310 mtazamo wangu wa MVC mbinu. 1344 01:08:10,310 --> 01:08:12,750 Hivyo mimi nina uchapishaji katika HTML. 1345 01:08:12,750 --> 01:08:16,670 >> Watazamaji: Hivyo kama sisi akaingia developer zana baada ya mbio hii, tunaweza 1346 01:08:16,670 --> 01:08:17,160 kwamba kweli katika kanuni? 1347 01:08:17,160 --> 01:08:18,410 >> ZAMYLA CHAN: Hiyo ni kubwa swali, yeah. 1348 01:08:18,410 --> 01:08:22,359 Hivyo kama wewe akaenda katika zana developer katika Firefox kwa kutumia Firebug au 1349 01:08:22,359 --> 01:08:26,109 Chrome, kisha yeah, unaweza kuona HTML maalum. 1350 01:08:26,109 --> 01:08:28,470 Hivyo hakutaka kuonyesha $ mstari ["Jina"]. 1351 01:08:28,470 --> 01:08:32,524 Itakuwa kuonyesha kwa namna yoyote jina ni katika mstari huo. 1352 01:08:32,524 --> 01:08:36,268 >> Watazamaji: Just suala ujumla, nini ni tr na magonjwa ya zinaa hufafanuliwa kama? 1353 01:08:36,268 --> 01:08:37,672 Kwa nini sisi [inaudible]? 1354 01:08:37,672 --> 01:08:41,850 1355 01:08:41,850 --> 01:08:44,814 >> ZAMYLA CHAN: Table mstari tr, meza kisha td safu. 1356 01:08:44,814 --> 01:08:48,060 1357 01:08:48,060 --> 01:08:49,310 OK. 1358 01:08:49,310 --> 01:08:55,771 1359 01:08:55,771 --> 01:08:56,835 >> Watazamaji: Yeah, ni data meza. 1360 01:08:56,835 --> 01:08:58,770 >> ZAMYLA CHAN: data meza. 1361 01:08:58,770 --> 01:08:59,894 Yeah. 1362 01:08:59,894 --> 01:09:08,670 >> Watazamaji: Ni mstari ambayo mstari ni kutibiwa kama safu? 1363 01:09:08,670 --> 01:09:08,910 >> ZAMYLA CHAN: Sorry. 1364 01:09:08,910 --> 01:09:10,570 Unaweza kurudia kwamba? 1365 01:09:10,570 --> 01:09:14,450 >> Watazamaji: Ni kwa jinsi gani taswira safu? 1366 01:09:14,450 --> 01:09:16,310 >> ZAMYLA CHAN: jinsi gani taswira safu katika aina gani ya njia? 1367 01:09:16,310 --> 01:09:21,796 Je, wewe ni kuzungumza juu ya haya safu hapa au safu tr? 1368 01:09:21,796 --> 01:09:22,630 >> Watazamaji: mistari. 1369 01:09:22,630 --> 01:09:25,229 >> ZAMYLA CHAN: safu hizi hapa? 1370 01:09:25,229 --> 01:09:28,620 Ningependa taswira hii kama Mimi nitafanya hoja yangu. 1371 01:09:28,620 --> 01:09:38,729 Na inasema, OK, nina aidha 0 kwa n kiasi cha safu wanaofanana na vigezo 1372 01:09:38,729 --> 01:09:40,510 kwamba alikuwa aliuliza. 1373 01:09:40,510 --> 01:09:43,740 Hivyo mimi na baadhi ya idadi ya mistari. 1374 01:09:43,740 --> 01:09:51,450 Hivyo safu, safu $, maduka ya kila moja ya mistari wale katika safu. 1375 01:09:51,450 --> 01:09:58,110 Hivyo hata kama ni moja tu kati yao, ni bado safu ya safu kwamba mechi hiyo. 1376 01:09:58,110 --> 01:10:03,010 >> Hivyo basi, kwa mfano, hii ni sawa na wakati fetched 1377 01:10:03,010 --> 01:10:05,390 cache kutoka kwa watumiaji. 1378 01:10:05,390 --> 01:10:10,810 Na vigezo kulikuwa ambapo ID ni sawa na kikao cha ID. 1379 01:10:10,810 --> 01:10:14,250 Kuna kweli tu ni mstari mmoja ambayo inaweza mechi hiyo. 1380 01:10:14,250 --> 01:10:18,960 Lakini bado safu tu akarudi mstari mmoja. 1381 01:10:18,960 --> 01:10:22,620 Hivyo d kwenda safu, index 0, index cache kwa 1382 01:10:22,620 --> 01:10:26,195 kweli kupata cache yako. 1383 01:10:26,195 --> 01:10:29,650 >> Watazamaji: Je, magazeti kazi katika echo kitu kimoja? 1384 01:10:29,650 --> 01:10:30,670 >> ZAMYLA CHAN: Ndiyo. 1385 01:10:30,670 --> 01:10:31,190 Ndiyo. 1386 01:10:31,190 --> 01:10:33,304 Magazeti echo ya sawa. 1387 01:10:33,304 --> 01:10:42,400 >> Watazamaji: Je, foreach kitanzi njia pekee ya index katika safu? 1388 01:10:42,400 --> 01:10:46,110 >> ZAMYLA CHAN: Je, foreach kitanzi njia pekee ambayo unaweza 1389 01:10:46,110 --> 01:10:47,030 iterate kwa njia ya safu? 1390 01:10:47,030 --> 01:10:47,180 Hapana 1391 01:10:47,180 --> 01:10:51,000 Unaweza pia kutumia kwa kitanzi, mradi kwamba unajua urefu 1392 01:10:51,000 --> 01:10:53,024 ya safu safu ya. 1393 01:10:53,024 --> 01:10:58,500 >> Watazamaji: Unaweza kupata hiyo kutumia mstari kama [inaudible]? 1394 01:10:58,500 --> 01:11:01,640 >> ZAMYLA CHAN: Kwa hiyo huwezi kupata ni tu kwa kutumia mstari kama huna 1395 01:11:01,640 --> 01:11:05,160 foreach kitanzi mradi wewe si alitangaza mfululizo. 1396 01:11:05,160 --> 01:11:08,150 1397 01:11:08,150 --> 01:11:09,660 Ndiyo. 1398 01:11:09,660 --> 01:11:10,810 Yeah, katika nyeupe. 1399 01:11:10,810 --> 01:11:13,990 >> Watazamaji: Basi je, tr na magonjwa ya zinaa nini? 1400 01:11:13,990 --> 01:11:16,790 >> ZAMYLA CHAN: Kwa hiyo tr na td ni HTML. 1401 01:11:16,790 --> 01:11:19,590 tr inaonyesha mwanzo ya mstari wa meza. 1402 01:11:19,590 --> 01:11:26,625 Na kila td inaonyesha meza mpya data safu. 1403 01:11:26,625 --> 01:11:32,275 >> Watazamaji: Kwa Visual ya nini mstari ni kama, tu kufikiria SQL, jinsi 1404 01:11:32,275 --> 01:11:33,510 wao na mfululizo. 1405 01:11:33,510 --> 01:11:35,980 [Inaudible]. 1406 01:11:35,980 --> 01:11:36,390 >> ZAMYLA CHAN: Yeah. 1407 01:11:36,390 --> 01:11:37,630 Hiyo ni hatua kubwa. 1408 01:11:37,630 --> 01:11:41,510 Unaweza taswira safu kama tu kama katika meza Excel, tu 1409 01:11:41,510 --> 01:11:44,540 orodha ya mistari. 1410 01:11:44,540 --> 01:11:46,870 OK. 1411 01:11:46,870 --> 01:11:47,230 Sawa. 1412 01:11:47,230 --> 01:11:50,740 Hivyo sasa kwamba tumeenda juu ya kuchagua, kama kuna maswali yoyote zaidi, tutaweza 1413 01:11:50,740 --> 01:11:52,970 kwenda juu kwenye kuingiza. 1414 01:11:52,970 --> 01:11:58,220 Basi, ikiwa mimi alitaka kuingiza katika baadhi ya meza na kuingiza safu baadhi ya 1415 01:11:58,220 --> 01:12:02,320 maadili, mimi nilikuwa kuingiza mwenyewe ndani ya Ravenclaw katika mwaka 7. 1416 01:12:02,320 --> 01:12:07,245 Lakini wakati mwingine huenda kuna duplicate maadili, kama tuliona katika pset7 wakati sisi 1417 01:12:07,245 --> 01:12:09,240 walikuwa kuhuisha kwingineko yetu. 1418 01:12:09,240 --> 01:12:15,610 >> Hivyo katika kesi hii, tunataka matumizi ya DUPLICATE KEY UPDATE, hivyo kwamba sisi si 1419 01:12:15,610 --> 01:12:18,280 kuhifadhi safu mbalimbali kwa moja thamani lakini badala update. 1420 01:12:18,280 --> 01:12:21,780 1421 01:12:21,780 --> 01:12:25,560 Kisha sisi kweli kuwa update, ambayo si kuingiza. 1422 01:12:25,560 --> 01:12:30,100 Ni tu update ambapo update katika meza fulani na kupewa 1423 01:12:30,100 --> 01:12:34,403 vigezo na kisha, mwisho, kufuta, ambayo haina kitu sawa sana. 1424 01:12:34,403 --> 01:12:40,200 >> Watazamaji: Je, kwa ufupi kwenda juu muhimu duplicate? 1425 01:12:40,200 --> 01:12:40,850 >> ZAMYLA CHAN: Yeah. 1426 01:12:40,850 --> 01:12:48,340 Kimsingi hapa, nina kuingiza ndani ya gringotts, ni, galleons, maadili haya. 1427 01:12:48,340 --> 01:12:56,900 Lakini ID, labda, ni muhimu kipekee thamani kuanzisha katika MySQL meza. 1428 01:12:56,900 --> 01:13:06,750 Basi, ikiwa mimi tayari kwamba ID kuanzisha, kisha siwezi kuingiza safu mpya. 1429 01:13:06,750 --> 01:13:10,961 Hivyo kama haipo tayari, basi mimi na update. 1430 01:13:10,961 --> 01:13:16,040 1431 01:13:16,040 --> 01:13:17,722 Katikati katika nyeupe. 1432 01:13:17,722 --> 01:13:21,570 >> Watazamaji: Kwa hiyo kuingiza, update, kufuta, na kuchagua, ni wale wote inapatikana 1433 01:13:21,570 --> 01:13:22,875 ndani ya nchi [inaudible]? 1434 01:13:22,875 --> 01:13:27,320 1435 01:13:27,320 --> 01:13:29,630 >> ZAMYLA CHAN: Kwa hiyo kuingiza, update, kufuta, na 1436 01:13:29,630 --> 01:13:31,120 kuchagua ni maswali yote SQL. 1437 01:13:31,120 --> 01:13:34,970 Hivyo wakati wowote unatumia SQL, itabidi wale inapatikana. 1438 01:13:34,970 --> 01:13:38,226 1439 01:13:38,226 --> 01:13:40,706 >> Watazamaji: Nyuma ya Quizzes iliyopita - 1440 01:13:40,706 --> 01:13:44,178 kulikuwa na swali kwamba kushughulikiwa na kama alikuwa na meza na alitaka 1441 01:13:44,178 --> 01:13:52,610 kuingiza alama mtihani katika moja na kuingiza jina lako hivyo itakuwa si basi wewe 1442 01:13:52,610 --> 01:13:54,594 [Inaudible] rafiki yako mtihani score. 1443 01:13:54,594 --> 01:13:59,060 Jinsi gani unaweza kufanya hivyo kwa kuingiza? 1444 01:13:59,060 --> 01:14:02,490 >> ZAMYLA CHAN: Kwa hiyo swali mara kuhusu uliopita swali katikati mrefu. 1445 01:14:02,490 --> 01:14:04,320 Mimi nina ufahamu ambayo moja ni haki sasa. 1446 01:14:04,320 --> 01:14:06,790 Hivyo labda baada ya hapo, kama unataka kuja na kuonyesha yangu, basi mimi unaweza 1447 01:14:06,790 --> 01:14:08,155 hakika kukupa tips. 1448 01:14:08,155 --> 01:14:11,250 1449 01:14:11,250 --> 01:14:15,460 Lakini akizungumza ya kuingiza mambo, kama kuchukua alama ya mtu wakati 1450 01:14:15,460 --> 01:14:18,800 hawapaswi, hebu majadiliano juu ya SQL sindano mashambulizi. 1451 01:14:18,800 --> 01:14:22,050 Hivyo mashambulizi SQL sindano kimsingi ni ambapo mtu inachukua 1452 01:14:22,050 --> 01:14:27,680 faida ya usalama chini ya njia kuwa wewe ni kuchukua katika data. 1453 01:14:27,680 --> 01:14:35,660 >> Hivyo katika hapa, kama katika CS50 fedha, wakati sisi watumiaji katika, tunaweza kuingia katika 1454 01:14:35,660 --> 01:14:39,510 jina la mtumiaji katika fomu kuingia, kwanza Nakala sanduku, na 1455 01:14:39,510 --> 01:14:41,570 kisha kuingia katika password. 1456 01:14:41,570 --> 01:14:45,610 Labda PHP kanuni zetu ili kuangalia kitu kama hiki, ambapo $ jina la mtumiaji 1457 01:14:45,610 --> 01:14:51,410 ni jina la mtumiaji baada ya data na password ni baada ya data password. 1458 01:14:51,410 --> 01:14:55,110 Na kisha sisi tu kutekeleza swala yetu, kusema, OK, vizuri, swala yetu ni kwenda 1459 01:14:55,110 --> 01:14:57,990 kuchagua kutoka kwa watumiaji wetu, ambapo jina la mtumiaji ni 1460 01:14:57,990 --> 01:14:58,970 moja kwamba waliwasilisha. 1461 01:14:58,970 --> 01:15:06,870 Na password ni password, maana kwamba nywila mechi. 1462 01:15:06,870 --> 01:15:12,670 >> Sasa, nini kama badala ya kweli kuwasilisha password halisi, kama 1463 01:15:12,670 --> 01:15:16,850 12,345 na kubahatisha katika prong kwamba anasema password na kujaribu hack yao 1464 01:15:16,850 --> 01:15:21,460 akaunti, nini kama badala wao in hii. 1465 01:15:21,460 --> 01:15:24,380 Wangeweza aina katika labda nadhani katika password. 1466 01:15:24,380 --> 01:15:30,480 Na kisha wangeweza kumaliza quote basi aina ya au 1 = 1. 1467 01:15:30,480 --> 01:15:35,160 Hiyo kasi moja kwa moja kwenye SQL swala kuangalia kitu kama hiki. 1468 01:15:35,160 --> 01:15:38,200 Kuchagua kutoka kwa watumiaji ambapo jina la mtumiaji = Prongs na password 1469 01:15:38,200 --> 01:15:41,450 sawa na lily au 1 = 1. 1470 01:15:41,450 --> 01:15:45,450 >> Hivyo aidha password ina kuwa sahihi au 1 = 1, 1471 01:15:45,450 --> 01:15:47,870 ambayo ni kweli daima. 1472 01:15:47,870 --> 01:15:52,780 Hivyo katika kesi hii, kimsingi, mtumiaji anaweza kuchukua fursa hii na kuingia tu 1473 01:15:52,780 --> 01:15:55,240 wenyewe katika na hack akaunti ya mtu. 1474 01:15:55,240 --> 01:15:58,950 Hivyo ndiyo sababu tunataka kuepuka mtu kuwa na kufanya hivyo. 1475 01:15:58,950 --> 01:16:03,890 Lakini kwa bahati, swala kazi kwa kupita katika placeholders itachukua 1476 01:16:03,890 --> 01:16:04,800 utunzaji wa hii kwa ajili yenu. 1477 01:16:04,800 --> 01:16:08,570 Pia, utasikia kawaida kamwe wanataka kwa kweli kuwasilisha nywila 1478 01:16:08,570 --> 01:16:09,310 wenyewe. 1479 01:16:09,310 --> 01:16:14,115 Hiyo ni kwa nini sisi heshi au encrypted yao katika CS50 fedha. 1480 01:16:14,115 --> 01:16:17,553 >> Watazamaji: Jaribio zamani aliyesema kuhusu MySQL kutoroka masharti. 1481 01:16:17,553 --> 01:16:21,800 Je, sisi kuwa na wasiwasi kuhusu hilo? 1482 01:16:21,800 --> 01:16:22,670 >> ZAMYLA CHAN: Hilo ni swali zuri. 1483 01:16:22,670 --> 01:16:29,050 MySQL kutoroka masharti ni dhahiri kazi ambayo ilitumika katika swala zetu. 1484 01:16:29,050 --> 01:16:30,420 Lakini dhahiri kuangalia katika hiyo. 1485 01:16:30,420 --> 01:16:32,950 Ningependa kusema kwamba haki mchezo kujua kwamba Ningependa haja ya simu kwamba 1486 01:16:32,950 --> 01:16:34,370 kazi juu ya kamba. 1487 01:16:34,370 --> 01:16:35,245 Yeah, Belinda? 1488 01:16:35,245 --> 01:16:38,606 >> Watazamaji: Je, unajua wakati ni quotes moja au quotes mbili? 1489 01:16:38,606 --> 01:16:43,516 Na pia, mimi kuhisi kama katika hotuba ninyi zilizotajwa kitu juu ya kutokuwa na 1490 01:16:43,516 --> 01:16:48,426 [Inaudible] au kitu au single ya pili quote mwishoni. 1491 01:16:48,426 --> 01:16:56,407 1492 01:16:56,407 --> 01:17:00,825 Nadhani alisema katika hotuba kwamba wewe ni walidhani kuwa apostrophe 1 1493 01:17:00,825 --> 01:17:04,290 na kisha kuwa na apostrophes au kitu. 1494 01:17:04,290 --> 01:17:05,540 >> Watazamaji: [inaudible]. 1495 01:17:05,540 --> 01:17:14,860 1496 01:17:14,860 --> 01:17:18,657 >> Watazamaji: Jambo ni moja ya mwisho quote huko katika sanduku pili 1497 01:17:18,657 --> 01:17:19,391 haipaswi kuwa hapo. 1498 01:17:19,391 --> 01:17:21,840 [Inaudible] 1499 01:17:21,840 --> 01:17:26,730 Kwa sababu wakati wewe kuchukua moja mwisho kunukuu nje na mechi hizi kwa maudhui 1500 01:17:26,730 --> 01:17:30,522 ambapo password ni, kama una kwamba swala, kuna quote moja katika 1501 01:17:30,522 --> 01:17:31,340 mwisho tayari. 1502 01:17:31,340 --> 01:17:36,580 Unataka kutumia quote moja kama moja ambayo nyuso moja 1503 01:17:36,580 --> 01:17:37,574 [Inaudible]. 1504 01:17:37,574 --> 01:17:42,820 Basi nini kweli katika maandishi kwamba sanduku haipaswi kuwa na hiyo. 1505 01:17:42,820 --> 01:17:44,070 >> ZAMYLA CHAN: Mimi itabidi mabadiliko hayo. 1506 01:17:44,070 --> 01:17:56,490 1507 01:17:56,490 --> 01:17:56,880 OK. 1508 01:17:56,880 --> 01:18:00,435 Kama kuna maswali yoyote, basi mimi itabidi kupita juu ya Joseph kuzungumza 1509 01:18:00,435 --> 01:18:04,332 kuhusu JavaScript, na kadhalika. 1510 01:18:04,332 --> 01:18:09,540 >> [Makofi] 1511 01:18:09,540 --> 01:18:11,660 >> JOSEPH Ong: Hivyo sisi ni mbio kidogo nyuma. 1512 01:18:11,660 --> 01:18:13,280 Hivyo kama una kuondoka, kwamba ni sawa. 1513 01:18:13,280 --> 01:18:16,540 Lakini sisi kuuliza kwamba kuweka vichwa yako chini kama uko katikati, hivyo 1514 01:18:16,540 --> 01:18:19,560 si kuzuia kamera na matumizi ya nyuma exit kama una. 1515 01:18:19,560 --> 01:18:25,010 1516 01:18:25,010 --> 01:18:26,306 Mimi nina Joseph kwa njia. 1517 01:18:26,306 --> 01:18:27,556 Hi. 1518 01:18:27,556 --> 01:18:37,910 1519 01:18:37,910 --> 01:18:38,630 Mtihani, mtihani. 1520 01:18:38,630 --> 01:18:39,630 Dan, ni mzuri? 1521 01:18:39,630 --> 01:18:40,880 Baridi. 1522 01:18:40,880 --> 01:18:44,460 1523 01:18:44,460 --> 01:18:47,600 >> Hivyo video pia kuwa posted online kwa wale ambao 1524 01:18:47,600 --> 01:18:48,850 na kuondoka sasa. 1525 01:18:48,850 --> 01:18:51,350 1526 01:18:51,350 --> 01:18:52,600 Awkward. 1527 01:18:52,600 --> 01:18:56,300 1528 01:18:56,300 --> 01:18:57,510 OK. 1529 01:18:57,510 --> 01:18:59,730 Hivyo jaribio mapitio. 1530 01:18:59,730 --> 01:19:00,980 Hii ni paka. 1531 01:19:00,980 --> 01:19:03,150 1532 01:19:03,150 --> 01:19:07,170 Sasa, JavaScript, ambayo ni labda si kama aww kwa baadhi ya nyie. 1533 01:19:07,170 --> 01:19:07,370 OK. 1534 01:19:07,370 --> 01:19:09,280 Hivyo kwamba ni ya kwanza, kukumbuka kutoka Zamyla. 1535 01:19:09,280 --> 01:19:11,270 Kumbuka kwamba PHP ni kukimbia kwenye server. 1536 01:19:11,270 --> 01:19:15,230 Na kura ya mara, you guys aliandika loops katika PHP na magazeti nje HTML, sawa? 1537 01:19:15,230 --> 01:19:19,170 Hivyo mara moja kwamba kanuni executes, kwamba Pato HTML kwamba magazeti nje 1538 01:19:19,170 --> 01:19:20,500 anapata alimtuma kwa mtumiaji. 1539 01:19:20,500 --> 01:19:25,960 Na mara moja kuwa kinachotokea, hakuna PHP zaidi unaweza kuwa na kukimbia, isipokuwa upya ukurasa, ya 1540 01:19:25,960 --> 01:19:27,660 Bila shaka, ambayo reexecutes PHP. 1541 01:19:27,660 --> 01:19:30,080 Lakini mara moja magazeti kuwa HTML, huwezi kwenda popote. 1542 01:19:30,080 --> 01:19:33,580 >> Ili HTML ni alimtuma juu kwa mtumiaji, ambayo ni browser zaidi ya hapa, ambapo 1543 01:19:33,580 --> 01:19:35,470 Milo ni kutumia kompyuta. 1544 01:19:35,470 --> 01:19:40,340 Na hivyo vizuri, kuna mambo kadhaa mara moja sisi kutuma HTML kwa mtumiaji. 1545 01:19:40,340 --> 01:19:43,350 Wakati mwingine sisi wanataka kufanya kitu kama wakati bonyeza juu ya kitu, tunataka 1546 01:19:43,350 --> 01:19:47,350 masanduku ya tahadhari kwa pop up, wale aina ya mwingiliano, kama wakati vyombo vya habari 1547 01:19:47,350 --> 01:19:50,740 muhimu, wakati bonyeza kitu juu ya ukurasa, nataka kitu kutokea. 1548 01:19:50,740 --> 01:19:54,550 Naam, huwezi reexecute PHP code mara moja kwamba HTML ni kuweka. 1549 01:19:54,550 --> 01:19:55,900 Hivyo ni jinsi gani unaweza kufanya hili? 1550 01:19:55,900 --> 01:19:59,930 >> Sisi kuanzisha lugha mpya iitwayo JavaScript, ambayo inaendesha katika browser 1551 01:19:59,930 --> 01:20:02,890 kwamba utapata kufanya mambo HTML baada ya kupokea 1552 01:20:02,890 --> 01:20:04,020 yao kutoka server. 1553 01:20:04,020 --> 01:20:07,050 Na hii ni kwa nini sisi kuiita mteja upande lugha ya programu. 1554 01:20:07,050 --> 01:20:09,110 Ni kazi kwenye kompyuta yako - 1555 01:20:09,110 --> 01:20:11,400 mteja. 1556 01:20:11,400 --> 01:20:13,830 Maswali yoyote kuhusu kwamba hadi sasa? 1557 01:20:13,830 --> 01:20:15,650 Dhana kwamba inafanya hisia kwa watu? 1558 01:20:15,650 --> 01:20:16,010 OK. 1559 01:20:16,010 --> 01:20:16,790 Nzuri. 1560 01:20:16,790 --> 01:20:17,340 Sawa. 1561 01:20:17,340 --> 01:20:20,850 Hivyo Jambo la kwanza kutambua ni JavaScript ni si PHP. 1562 01:20:20,850 --> 01:20:23,010 >> Wana baadhi ya syntax mbalimbali, ambayo tutaweza kwenda katika. 1563 01:20:23,010 --> 01:20:24,530 Na wao wana matumizi tofauti sana. 1564 01:20:24,530 --> 01:20:26,640 JavaScript, tena, kwa ajili yako browser, kwa mteja. 1565 01:20:26,640 --> 01:20:30,640 Server anaendesha mahali fulani juu ya mtu mwingine kompyuta anaye habari 1566 01:20:30,640 --> 01:20:31,720 na wewe, ni sahihi? 1567 01:20:31,720 --> 01:20:36,730 Hivyo kama tunakuomba kuandika PHP code juu ya suala mtihani, wala kuandika 1568 01:20:36,730 --> 01:20:38,710 JavaScript na kinyume chake. 1569 01:20:38,710 --> 01:20:41,710 Utasikia tu kupoteza pointi, na itakuwa si kuwa na haki. 1570 01:20:41,710 --> 01:20:43,690 >> Basi hebu kupata katika baadhi ya syntax tofauti - 1571 01:20:43,690 --> 01:20:46,140 JavaScript upande wa kushoto na PHP juu ya haki. 1572 01:20:46,140 --> 01:20:48,670 Jambo la kwanza utasikia taarifa na JavaScript, sisi kutangaza vigezo na 1573 01:20:48,670 --> 01:20:49,440 var keyword - 1574 01:20:49,440 --> 01:20:53,590 V-A-R. PHP kutumika ishara ya dola, kama Zamyla kujadiliwa mapema. 1575 01:20:53,590 --> 01:20:57,570 Kama unataka kutangaza associative safu, tunaona syntax ukoo juu ya 1576 01:20:57,570 --> 01:20:59,030 upande wa kulia na PHP. 1577 01:20:59,030 --> 01:21:01,630 Upande wa kushoto, badala matumizi ya braces curly. 1578 01:21:01,630 --> 01:21:03,280 Na kisha funguo yako ni upande wa kushoto. 1579 01:21:03,280 --> 01:21:04,670 Kisha una koloni. 1580 01:21:04,670 --> 01:21:06,560 Na kisha una maadili kwamba unataka. 1581 01:21:06,560 --> 01:21:09,840 >> Hivyo hii ni jinsi gani kufanya hivyo katika PHP upande wa kulia na kwamba pili 1582 01:21:09,840 --> 01:21:10,955 line kwamba kuanza saa Milo. 1583 01:21:10,955 --> 01:21:14,540 Na kwamba ni jinsi gani kufanya hivyo kwa upande wa kushoto katika JavaScript kama unataka 1584 01:21:14,540 --> 01:21:16,110 kile tunachokiita kitu. 1585 01:21:16,110 --> 01:21:19,340 Na vitu katika JavaScript ni tu associative arrays. 1586 01:21:19,340 --> 01:21:23,710 Hivyo kama unataka kupata mashamba, katika PHP kutumia hii syntax bracket. 1587 01:21:23,710 --> 01:21:27,170 Na kwa njia hii, unaweza reassign uwanja huu mmiliki wa Lauren. 1588 01:21:27,170 --> 01:21:30,150 >> Naam, katika JavaScript, kama mtu unataka kupata shamba na mabadiliko hayo, unaweza 1589 01:21:30,150 --> 01:21:31,370 kutumia dot syntax. 1590 01:21:31,370 --> 01:21:33,860 Unaweza pia kutumia mabano syntax. 1591 01:21:33,860 --> 01:21:35,550 Lakini huwezi kutumia dot syntax katika PHP. 1592 01:21:35,550 --> 01:21:36,525 Hiyo si kazi. 1593 01:21:36,525 --> 01:21:38,910 Ni kazi tu katika PHP. 1594 01:21:38,910 --> 01:21:42,060 Na hatimaye, magazeti mambo ya console, unaweza kutumia console.log, ambayo 1595 01:21:42,060 --> 01:21:43,720 nyie matumizi mengi katika pset8. 1596 01:21:43,720 --> 01:21:45,260 Unaweza console.log hiyo. 1597 01:21:45,260 --> 01:21:50,030 >> Kama unataka magazeti safu katika PHP, una kutumia magazeti r. 1598 01:21:50,030 --> 01:21:53,240 Na upande wa kulia, unaweza kuona i hash kamba concatenation zaidi ya hapo. 1599 01:21:53,240 --> 01:21:54,070 Mtu mmoja alimuuliza mapema. 1600 01:21:54,070 --> 01:21:55,850 Mimi kutumia pamoja na katika JavaScript. 1601 01:21:55,850 --> 01:21:59,800 Kama mimi nataka concatenate kitu katika PHP, mimi kutumia dot. 1602 01:21:59,800 --> 01:22:00,800 Hizi ni tofauti. 1603 01:22:00,800 --> 01:22:03,420 Kama wewe ni kuandika PHP code, wala kutumia plus. 1604 01:22:03,420 --> 01:22:06,810 Kama wewe ni kuandika JavaScript code, wala kuandika dot. 1605 01:22:06,810 --> 01:22:08,230 Itakuwa vibaya. 1606 01:22:08,230 --> 01:22:09,640 Na wewe utakuwa na huzuni. 1607 01:22:09,640 --> 01:22:11,000 >> Hivyo syntax tofauti. 1608 01:22:11,000 --> 01:22:14,710 Kujua syntax yako, kwa sababu kama una kuandika swali na matumizi ya syntax 1609 01:22:14,710 --> 01:22:16,890 kutoka lugha vibaya, itakuwa si kazi. 1610 01:22:16,890 --> 01:22:19,520 Na itakuwa makosa. 1611 01:22:19,520 --> 01:22:22,420 Hivyo basi majadiliano juu ya baadhi ya kudhibiti kati yake tofauti, jinsi ya kutumia 1612 01:22:22,420 --> 01:22:24,040 matanzi katika kila mmoja wao. 1613 01:22:24,040 --> 01:22:26,610 Zamyla akaenda juu ya upande wa kulia. 1614 01:22:26,610 --> 01:22:27,780 Mambo upande wa kulia wanapaswa kuwa ukoo. 1615 01:22:27,780 --> 01:22:29,670 Hebu tuangalie upande wa kushoto. 1616 01:22:29,670 --> 01:22:34,830 >> Wakati kutumia kwa ajili ya n kitanzi katika JavaScript, kitanzi variable yako, var i zaidi ya hapo, 1617 01:22:34,830 --> 01:22:37,210 kitanzi juu ya funguo wa safu. 1618 01:22:37,210 --> 01:22:39,150 Hivyo unaweza kuona jina, nyumba, na jukumu. 1619 01:22:39,150 --> 01:22:42,440 Kama mimi console.log i, mimi kupata jina, nyumba, na jukumu. 1620 01:22:42,440 --> 01:22:44,720 Wale ni funguo. 1621 01:22:44,720 --> 01:22:50,080 Katika JavaScript, foreach kitanzi huenda juu ya maadili ya safu hii. 1622 01:22:50,080 --> 01:22:52,040 Hivyo taarifa wao ni wote i. 1623 01:22:52,040 --> 01:22:56,000 Lakini katika hapa upande wa PHP, prints nje Milo, CS50, na Mascot. 1624 01:22:56,000 --> 01:22:57,390 Wale ni maadili katika PHP. 1625 01:22:57,390 --> 01:23:00,180 >> Basi hao ni jinsi hizi mbili ni tofauti katika lugha mbalimbali. 1626 01:23:00,180 --> 01:23:02,970 Hivyo kama wewe ni kutumia foreach kitanzi, wala kudhani kuwa ni 1627 01:23:02,970 --> 01:23:03,760 anatoa funguo. 1628 01:23:03,760 --> 01:23:08,010 Na kama wewe ni kutumia kwa ajili ya n kitanzi, si kudhani inakupa maadili. 1629 01:23:08,010 --> 01:23:10,420 Je, hii kufanya akili hadi sasa? 1630 01:23:10,420 --> 01:23:13,630 slide ya pili ni kwenda kuonyesha jinsi gani wanaweza kupata kinyume katika 1631 01:23:13,630 --> 01:23:15,160 kila mmoja wao. 1632 01:23:15,160 --> 01:23:18,550 >> Naam, kama una muhimu katika JavaScript na unataka thamani nje, 1633 01:23:18,550 --> 01:23:20,440 wewe tu index katika safu na kwamba. 1634 01:23:20,440 --> 01:23:23,640 Hivyo Milo ya i kupata nini unataka - maadili. 1635 01:23:23,640 --> 01:23:25,260 Kuna syntax hii tofauti katika PHP. 1636 01:23:25,260 --> 01:23:28,140 Kama kweli unataka kujua hayo, mimi si nadhani tumekuwa ilionyesha wewe bado. 1637 01:23:28,140 --> 01:23:31,740 Lakini kama wewe ni nia, unaweza kutumia syntax hii ya nyongeza juu ya haki 1638 01:23:31,740 --> 01:23:35,130 upande kwamba kwa kweli basi kupata funguo katika PHP wakati unatumia 1639 01:23:35,130 --> 01:23:35,880 foreach kitanzi. 1640 01:23:35,880 --> 01:23:39,640 Hivyo tu kidogo ya trivia kama wewe ni nia. 1641 01:23:39,640 --> 01:23:42,630 >> Ili tu kuonyesha tofauti kati ya loops hizi mbili. 1642 01:23:42,630 --> 01:23:47,060 Je, si kuchanganya yao juu wakati uko programu swali. 1643 01:23:47,060 --> 01:23:49,774 Maswali yoyote juu ya hilo. 1644 01:23:49,774 --> 01:23:50,770 Baridi. 1645 01:23:50,770 --> 01:23:51,310 Sawa. 1646 01:23:51,310 --> 01:23:52,250 JavaScript vitu. 1647 01:23:52,250 --> 01:23:53,040 Mimi kuongelea kuhusu yao. 1648 01:23:53,040 --> 01:23:54,650 Wao ni kama arrays associative. 1649 01:23:54,650 --> 01:23:57,730 jambo moja Ningependa kutambua hapa ni kwamba thamani katika associative 1650 01:23:57,730 --> 01:23:59,540 safu inaweza kuwa kitu chochote katika JavaScript. 1651 01:23:59,540 --> 01:24:02,240 >> Inaweza hata kuwa na kazi, kama zaidi ya hapo. 1652 01:24:02,240 --> 01:24:04,600 Nina kazi ambayo ni thamani ya muhimu. 1653 01:24:04,600 --> 01:24:07,030 Na kama nataka kuwaita kazi hiyo, I just kupata maganda. 1654 01:24:07,030 --> 01:24:08,490 Na kisha mimi kuweka mabano baada ya hapo. 1655 01:24:08,490 --> 01:24:09,790 Na kwamba kazi. 1656 01:24:09,790 --> 01:24:15,570 Kwa hiyo, maswali yoyote? 1657 01:24:15,570 --> 01:24:16,370 No? 1658 01:24:16,370 --> 01:24:16,650 OK. 1659 01:24:16,650 --> 01:24:18,190 Nzuri. 1660 01:24:18,190 --> 01:24:20,130 JavaScript, kama PHP, ni loosely typed. 1661 01:24:20,130 --> 01:24:20,970 Hiyo ina maana gani? 1662 01:24:20,970 --> 01:24:22,380 >> Ni gani aina. 1663 01:24:22,380 --> 01:24:24,800 Lakini wakati kutangaza JavaScript variable, unaweza kusema var i. 1664 01:24:24,800 --> 01:24:25,850 Huwezi kusema hivyo. 1665 01:24:25,850 --> 01:24:26,460 Hiyo si kitu. 1666 01:24:26,460 --> 01:24:28,000 Wewe tu kusema ni kutofautiana. 1667 01:24:28,000 --> 01:24:31,590 Na kisha JavaScript kushughulikia aina chini ya kofia kwa ajili yenu. 1668 01:24:31,590 --> 01:24:34,390 Tunaweza uhuru kubadilisha kati ya aina sababu ya hili. 1669 01:24:34,390 --> 01:24:37,360 Hivyo i kuanza nje kama idadi katika kesi hii. 1670 01:24:37,360 --> 01:24:38,790 Na kisha mimi na kamba. 1671 01:24:38,790 --> 01:24:39,710 Na mimi kuongeza i yake. 1672 01:24:39,710 --> 01:24:41,810 Na mimi reassign nyuma katika i. 1673 01:24:41,810 --> 01:24:43,640 >> Hivyo kuwa mstari wa kwanza, i ni idadi. 1674 01:24:43,640 --> 01:24:47,310 On line pili, i sasa inakuwa kamba baada ya mimi kufanya reassignment. 1675 01:24:47,310 --> 01:24:52,820 Na hapa, mimi nina concatenating tu kwamba idadi kwenye kamba. 1676 01:24:52,820 --> 01:24:56,210 Hivyo unaweza kuona kwamba hata kama i mara integer katika sehemu ya kwanza, ni aina 1677 01:24:56,210 --> 01:24:58,500 ya kama kuwa waongofu kwa kamba na kisha aliongeza kuwa 1678 01:24:58,500 --> 01:25:00,510 kwenye kamba kwamba hello. 1679 01:25:00,510 --> 01:25:02,340 Na hivyo kwamba ni nini I mean na kuandika huru. 1680 01:25:02,340 --> 01:25:04,760 Hiyo ni kwamba kubadilisha kati ya aina kwa urahisi sana. 1681 01:25:04,760 --> 01:25:08,840 Na haina kutupa onyo wewe kama C gani. 1682 01:25:08,840 --> 01:25:12,420 >> Hivyo i sasa ina hujambo 123 kwa kamba. 1683 01:25:12,420 --> 01:25:13,270 Next. 1684 01:25:13,270 --> 01:25:15,610 Tunaweza pia uhuru kulinganisha kati ya aina. 1685 01:25:15,610 --> 01:25:19,310 Hivyo kama wewe tu kutumia ==, sana sana kama katika PHP, JavaScript 1686 01:25:19,310 --> 01:25:20,480 kitu gani kama hayo. 1687 01:25:20,480 --> 01:25:24,780 kamba 123 ni sawa na idadi 123 wakati matumizi ya usawa mbili. 1688 01:25:24,780 --> 01:25:27,820 Wakati kutumika usawa tatu, pia anataka kuhakikisha kwamba 1689 01:25:27,820 --> 01:25:29,240 aina ni sawa. 1690 01:25:29,240 --> 01:25:31,960 Basi, kwa sababu kwamba ni kamba na kwamba ni idadi, ingawa wao ni wote 1691 01:25:31,960 --> 01:25:35,280 123, wakati matumizi ya tatu sawa, kupata uongo. 1692 01:25:35,280 --> 01:25:39,330 Katika mara mbili sawa na kesi, unaweza kupata kweli, kwa sababu ya usawa mbili haina 1693 01:25:39,330 --> 01:25:40,020 huduma ya juu aina. 1694 01:25:40,020 --> 01:25:42,500 Usawa tatu haina huduma ya juu aina. 1695 01:25:42,500 --> 01:25:43,750 Maswali? 1696 01:25:43,750 --> 01:25:45,790 1697 01:25:45,790 --> 01:25:48,390 OK. 1698 01:25:48,390 --> 01:25:52,870 >> Na kitu kingine kuhusu JavaScript ni wigo ni aina ya kimataifa kama wewe ni 1699 01:25:52,870 --> 01:25:53,460 katika kazi. 1700 01:25:53,460 --> 01:25:55,660 Na kazi hiyo njia katika PHP kweli. 1701 01:25:55,660 --> 01:25:57,500 Basi hebu kwenda kwa njia ya mfano huu. 1702 01:25:57,500 --> 01:25:59,110 Mimi kuweka i kwa 999. 1703 01:25:59,110 --> 01:26:00,900 Na kisha mimi kwenda katika hii kwa kitanzi. 1704 01:26:00,900 --> 01:26:06,110 Basi, ikiwa mimi nina uchapishaji i nje katika hii kwa kitanzi, mimi kutarajia 0, 1, 2, 3, 4. 1705 01:26:06,110 --> 01:26:07,390 Mimi kupata i = 4. 1706 01:26:07,390 --> 01:26:10,770 Ni nyongeza i sasa kwa 5 katika mwisho wa kwa kitanzi. 1707 01:26:10,770 --> 01:26:13,300 Na kisha inavunja nje ya kitanzi, kwa sababu haina kutimiza 1708 01:26:13,300 --> 01:26:14,550 Hali tena. 1709 01:26:14,550 --> 01:26:16,650 >> Je, unafikiri kwamba ijayo console.log Prints nje? 1710 01:26:16,650 --> 01:26:20,570 1711 01:26:20,570 --> 01:26:24,790 Hivyo kwamba ni nini ingekuwa kufanya katika C. Katika C, kwa sababu kama una kama var i nje 1712 01:26:24,790 --> 01:26:28,855 na una var i ndani ya kitanzi, kama kwa kitanzi, kisha inafanya kama kwamba 1713 01:26:28,855 --> 01:26:30,690 ni scoped kwamba wawili i ni tofauti. 1714 01:26:30,690 --> 01:26:34,630 Katika JavaScript, itakuwa tu kutibu kama i huo. 1715 01:26:34,630 --> 01:26:37,870 Mimi kupata 5, kwa sababu kwamba alikuwa thamani baada ya exited nje ya kitanzi. 1716 01:26:37,870 --> 01:26:39,120 Hivyo wale i ni i huo. 1717 01:26:39,120 --> 01:26:42,620 1718 01:26:42,620 --> 01:26:44,130 Je, hiyo mantiki? 1719 01:26:44,130 --> 01:26:45,720 >> Naam, ni mantiki kutoka JavaScript upande. 1720 01:26:45,720 --> 01:26:49,510 Lakini dhana hiyo haina kubeba zaidi ya C. Wana 1721 01:26:49,510 --> 01:26:50,310 mbalimbali ya sheria scoping. 1722 01:26:50,310 --> 01:26:50,630 Ndiyo. 1723 01:26:50,630 --> 01:26:52,566 >> Watazamaji: [inaudible] 1724 01:26:52,566 --> 01:26:54,990 nje kazi [inaudible]? 1725 01:26:54,990 --> 01:26:58,340 >> JOSEPH Ong: Kwa hiyo nje ambayo kazi? 1726 01:26:58,340 --> 01:27:00,810 Kwa hiyo nitakuwa kupata kwamba katika haki ya pili. 1727 01:27:00,810 --> 01:27:02,580 Hivyo tunatoa wito foo (i). 1728 01:27:02,580 --> 01:27:06,920 Hii hupita i ndani ya foo, nyongeza yake, na kisha kumbukumbu yake. 1729 01:27:06,920 --> 01:27:07,750 Hivyo ilikuwa 5. 1730 01:27:07,750 --> 01:27:09,210 Hivyo ni 6. 1731 01:27:09,210 --> 01:27:11,670 Lakini nini mimi kuzungumza juu ya ni kwamba i katika kazi hiyo. 1732 01:27:11,670 --> 01:27:14,430 Kwa sababu ni parameter, ni scoped kwa kazi hiyo. 1733 01:27:14,430 --> 01:27:17,800 Hivyo mara moja mimi kwa kweli kupata nje ya kwamba kazi, ni sasa kwenda 1734 01:27:17,800 --> 01:27:19,860 nyuma na umri i. 1735 01:27:19,860 --> 01:27:23,000 Hiyo i ni scoped tu kwa sababu ni katika kazi. 1736 01:27:23,000 --> 01:27:24,200 Na sisi kuwa na upeo na kazi. 1737 01:27:24,200 --> 01:27:29,080 Lakini hatuna wigo nje ya kazi katika JavaScript. 1738 01:27:29,080 --> 01:27:31,170 Je, hiyo mantiki? 1739 01:27:31,170 --> 01:27:31,320 Ndiyo. 1740 01:27:31,320 --> 01:27:31,660 Swali. 1741 01:27:31,660 --> 01:27:34,030 >> Watazamaji: Same [inaudible]? 1742 01:27:34,030 --> 01:27:34,500 >> JOSEPH Ong: Hivyo yeah. 1743 01:27:34,500 --> 01:27:36,260 Katika PHP, ni aina moja ya kitu. 1744 01:27:36,260 --> 01:27:37,680 Kuna hila kidogo kwa kweli. 1745 01:27:37,680 --> 01:27:40,130 Lakini unaweza kuuliza mimi kuhusu kwamba baada ya mapitio. 1746 01:27:40,130 --> 01:27:43,930 Si kweli haja ya kujua kwamba hila kwa jaribio. 1747 01:27:43,930 --> 01:27:47,600 Kwa nia yote hiyo na malengo, kama vigezo, kimataifa na PHP, isipokuwa 1748 01:27:47,600 --> 01:27:49,150 wao uko katika kazi, sawa na kitu katika JavaScript. 1749 01:27:49,150 --> 01:27:49,480 Ndiyo. 1750 01:27:49,480 --> 01:27:52,890 >> Watazamaji: Kwa nini hii ni kuruhusiwa katika JavaScript na hakuna ambapo mwingine? 1751 01:27:52,890 --> 01:27:55,010 >> JOSEPH Ong: Basi kwa nini ni kuruhusiwa katika JavaScript na si katika C? 1752 01:27:55,010 --> 01:27:58,180 Ni yeyote tu kuja na JavaScript aliamua kwamba hii ilikuwa sawa katika 1753 01:27:58,180 --> 01:27:59,510 JavaScript. 1754 01:27:59,510 --> 01:28:02,430 Hivyo tu kama lugha ya programu mkataba kama sisi kusema. 1755 01:28:02,430 --> 01:28:02,580 Ndiyo. 1756 01:28:02,580 --> 01:28:04,480 >> Watazamaji: Basi kwa nini alifanya ni kwenda 6-5? 1757 01:28:04,480 --> 01:28:08,280 >> JOSEPH Ong: Kwa hiyo akaenda 6-5, kwa sababu wakati mimi kupita i ndani ya foo, kwamba 1758 01:28:08,280 --> 01:28:13,420 i ndani ya foo sasa ni scoped kwa foo, kwa sababu wigo ipo katika kazi katika 1759 01:28:13,420 --> 01:28:15,050 JavaScript. 1760 01:28:15,050 --> 01:28:18,720 Lakini mara moja mimi kupata nje ya hapa, kwa sababu ilikuwa scoped kazi, mimi nina tu 1761 01:28:18,720 --> 01:28:24,300 kutumia i mara kwa mara kwamba alikuwa ndani ya wengine wa kudhibiti kati yake. 1762 01:28:24,300 --> 01:28:25,210 Mantiki? 1763 01:28:25,210 --> 01:28:26,910 Je, mimi hoja juu ya? 1764 01:28:26,910 --> 01:28:27,320 Sawa. 1765 01:28:27,320 --> 01:28:29,180 Baridi. 1766 01:28:29,180 --> 01:28:31,890 >> kukubali hii ni vitu ni kupita kwa kumbukumbu. 1767 01:28:31,890 --> 01:28:33,990 Unajua jinsi wakati kupita safu ndani ya C unaweza 1768 01:28:33,990 --> 01:28:35,810 kweli kurekebisha safu? 1769 01:28:35,810 --> 01:28:37,350 Ni kitu kimoja katika JavaScript ni. 1770 01:28:37,350 --> 01:28:42,960 Kama mimi kupita kitu, katika kesi hii, mimi kupita Milo katika hii kazi catify. 1771 01:28:42,960 --> 01:28:44,490 Milo kuanza nje. 1772 01:28:44,490 --> 01:28:46,310 Jina lake ni Milo Banana. 1773 01:28:46,310 --> 01:28:51,670 Mimi kupita kwamba kitu katika kazi kwa sababu ni kitu, associative 1774 01:28:51,670 --> 01:28:53,730 safu katika JavaScript. 1775 01:28:53,730 --> 01:28:57,110 >> Wakati mimi kufanya operesheni katika kazi hiyo, itakuwa 1776 01:28:57,110 --> 01:28:58,560 kweli mabadiliko ya kitu. 1777 01:28:58,560 --> 01:29:01,720 Hivyo hii itakuwa tu kutokea kwa vitu katika JavaScript, kama vile inajitokeza 1778 01:29:01,720 --> 01:29:09,230 kwa arrays ndani ya jina C. Hivyo Milo ya kweli kuwa paka sasa. 1779 01:29:09,230 --> 01:29:10,090 Je, hiyo mantiki? 1780 01:29:10,090 --> 01:29:11,840 Hivyo hii kazi tu kwa ajili ya vitu. 1781 01:29:11,840 --> 01:29:13,090 Vitu ni kupita kwa kumbukumbu. 1782 01:29:13,090 --> 01:29:13,400 Ndiyo. 1783 01:29:13,400 --> 01:29:16,850 >> Watazamaji: Hivyo wewe ni kusema kwamba tofauti na kutofautiana i. 1784 01:29:16,850 --> 01:29:17,240 >> JOSEPH Ong: Yeah. 1785 01:29:17,240 --> 01:29:20,330 Ambayo variable i mara tu idadi, sawa? 1786 01:29:20,330 --> 01:29:25,280 Ni kama katika C wakati kupita Integer, inafanya nakala. 1787 01:29:25,280 --> 01:29:28,130 Na wakati kupita safu, ni kweli mabadiliko safu halisi katika 1788 01:29:28,130 --> 01:29:32,870 C. kitu kimoja kinachotokea kwa JavaScript katika kesi hii. 1789 01:29:32,870 --> 01:29:34,070 Sawa. 1790 01:29:34,070 --> 01:29:38,134 Na wa pili, Milo ni huzuni kwa sababu yeye sasa paka. 1791 01:29:38,134 --> 01:29:40,790 1792 01:29:40,790 --> 01:29:45,060 Hiyo ilikuwa ni kweli Milo baada ya baadhi safari kwa daktari. 1793 01:29:45,060 --> 01:29:46,860 >> Hivyo ni jinsi gani sisi kutumia JavaScript katika ukurasa mtandao? 1794 01:29:46,860 --> 01:29:47,790 Tunaweza pamoja na hiyo. 1795 01:29:47,790 --> 01:29:50,090 Hii ni HTML code na vitambulisho strip. 1796 01:29:50,090 --> 01:29:51,300 Hivyo nina vitambulisho strip huko. 1797 01:29:51,300 --> 01:29:54,820 Na kisha mimi kuweka baadhi ya JavaScript code ndani ya vitambulisho script. 1798 01:29:54,820 --> 01:29:56,390 Na kisha executes hii. 1799 01:29:56,390 --> 01:29:58,830 Wakati mimi tu kufanya hivyo kama hii, ni aitwaye inline JavaScript. 1800 01:29:58,830 --> 01:30:02,400 Ni aina ya messy, kwa sababu JavaScript ni kweli katika HTML. 1801 01:30:02,400 --> 01:30:07,010 >> njia bora ya kufanya hivyo, kiasi nicer, ni kuandika yako JavaScript katika 1802 01:30:07,010 --> 01:30:10,920 file nje na kisha kutoa script tag na chanzo. 1803 01:30:10,920 --> 01:30:14,920 Na hii kwenda kwamba JavaScript file na kusoma JavaScript code kutoka 1804 01:30:14,920 --> 01:30:15,960 kwamba faili badala yake. 1805 01:30:15,960 --> 01:30:18,820 Na kwa njia hii, huna mengi ya JavaScript mwanzoni mwa yako 1806 01:30:18,820 --> 01:30:20,760 HTML file, ambayo inafanya ni kweli messy. 1807 01:30:20,760 --> 01:30:21,860 Wewe tu kuweka mahali pengine. 1808 01:30:21,860 --> 01:30:24,310 Na kisha itakuwa kusoma kutoka huko. 1809 01:30:24,310 --> 01:30:25,560 Je, kwamba inafanya hisia? 1810 01:30:25,560 --> 01:30:27,990 1811 01:30:27,990 --> 01:30:29,640 >> Upangaji mambo. 1812 01:30:29,640 --> 01:30:32,620 Katika kesi hii, script ni kabla ya mwili. 1813 01:30:32,620 --> 01:30:36,090 Hivyo wakati mimi nitafanya kwamba, kuna kitu katika mwili bado. 1814 01:30:36,090 --> 01:30:39,920 Labda hii kufanya kidogo zaidi maana wakati mimi kuonyesha sehemu hii ya pili. 1815 01:30:39,920 --> 01:30:43,210 Katika kesi hiyo, script inakuja baada ya div. 1816 01:30:43,210 --> 01:30:46,620 Hivyo div kweli inaonekana juu ya ukurasa wa kwanza. 1817 01:30:46,620 --> 01:30:49,470 Haki hapa katika mzunguko kidogo nyekundu, unaweza kuona Nakala inaonekana. 1818 01:30:49,470 --> 01:30:51,810 Na kisha macho inaonyesha up. 1819 01:30:51,810 --> 01:30:54,890 >> Katika kesi ya kwanza, kwa sababu script mara kabla ya div, 1820 01:30:54,890 --> 01:30:56,170 macho inaonyesha juu kwanza. 1821 01:30:56,170 --> 01:30:59,250 Na kisha div inaonyesha juu baada ya ninyi kumfukuza sanduku. 1822 01:30:59,250 --> 01:31:01,330 Hivyo utekelezaji mambo. 1823 01:31:01,330 --> 01:31:02,290 Hivyo tutaweza kuweka hii katika akili. 1824 01:31:02,290 --> 01:31:03,640 Hii itakuwa muhimu katika kidogo. 1825 01:31:03,640 --> 01:31:08,730 1826 01:31:08,730 --> 01:31:09,540 OK. 1827 01:31:09,540 --> 01:31:12,750 Vizuri, ni jinsi gani unaweza kusubiri hadi ukurasa mzima ni kubeba kisha kabla ya 1828 01:31:12,750 --> 01:31:13,580 kutekeleza baadhi ya kanuni? 1829 01:31:13,580 --> 01:31:15,540 Tutaweza kupata katika hili kidogo kidogo baadaye pia. 1830 01:31:15,540 --> 01:31:19,016 Lakini kuweka tu upangaji hii mambo katika akili kwa wakati sisi 1831 01:31:19,016 --> 01:31:20,570 kuja slide nyingine. 1832 01:31:20,570 --> 01:31:22,030 >> Hivyo sisi kupata DOM sasa. 1833 01:31:22,030 --> 01:31:23,550 Na ni nini DOM? 1834 01:31:23,550 --> 01:31:26,830 Hivyo kama ukiangalia HTML code, ni tu kundi la maandishi kwenye screen. 1835 01:31:26,830 --> 01:31:30,560 Hivyo ni jinsi gani JavaScript kujua kwamba hii ni HTML hiki? 1836 01:31:30,560 --> 01:31:33,410 Hivyo sisi kuwa na baadhi ya kumbukumbu uwakilishi wa hii 1837 01:31:33,410 --> 01:31:34,930 muundo kwamba tuna. 1838 01:31:34,930 --> 01:31:40,240 Na wakati wowote tuna hii katika kumbukumbu uwakilishi katika JavaScript, sisi kuwaita 1839 01:31:40,240 --> 01:31:41,750 kwamba DOM. 1840 01:31:41,750 --> 01:31:45,130 Na ni njia tu kwamba watu aliamua kwamba tunapaswa kuwakilisha hii 1841 01:31:45,130 --> 01:31:46,400 HTML muundo kama. 1842 01:31:46,400 --> 01:31:47,940 >> Na nini DOM hii kuangalia kama? 1843 01:31:47,940 --> 01:31:50,460 Naam, katika kumbukumbu ya uwakilishi, sisi kuchukua Nakala hii. 1844 01:31:50,460 --> 01:31:52,870 Na sisi kurejea ndani ya kumbukumbu uwakilishi. 1845 01:31:52,870 --> 01:31:54,400 Hivyo hii ni HTML. 1846 01:31:54,400 --> 01:31:58,090 Hivyo sisi kwanza kujua kwamba kila DOM mti hati. 1847 01:31:58,090 --> 01:31:59,400 Inaonekana kama mti. 1848 01:31:59,400 --> 01:32:03,550 Na hati ina HTML tag, kwa kweli kila kitu 1849 01:32:03,550 --> 01:32:05,150 ndani ya hii sasa. 1850 01:32:05,150 --> 01:32:06,970 Tag HTML ana watoto wawili. 1851 01:32:06,970 --> 01:32:08,630 Ina kichwa. 1852 01:32:08,630 --> 01:32:12,380 Kichwa kwamba, kama ukiangalia indentation zaidi ya hapo katika ni jinsi gani muundo 1853 01:32:12,380 --> 01:32:14,960 kati ya vitambulisho karibu, kichwa mtoto. 1854 01:32:14,960 --> 01:32:17,130 mtoto ni cheo. 1855 01:32:17,130 --> 01:32:18,370 Hasa. 1856 01:32:18,370 --> 01:32:21,000 >> Sasa, tuna mwili wa mtoto. 1857 01:32:21,000 --> 01:32:24,870 Na kisha mwili huo mtoto aitwaye familia. 1858 01:32:24,870 --> 01:32:27,950 Na familia ambayo ina watoto watatu - 1859 01:32:27,950 --> 01:32:29,550 kongwe, katikati, na mdogo. 1860 01:32:29,550 --> 01:32:31,960 Hivyo unapaswa kujua jinsi ya kuchora mchoro kama hii wakati sisi kuuliza jinsi 1861 01:32:31,960 --> 01:32:34,270 kuchora mchoro tunapotoa ninyi HTML upande wa kushoto. 1862 01:32:34,270 --> 01:32:36,350 Kujua jinsi ya kuzalisha DOM mti. 1863 01:32:36,350 --> 01:32:38,930 Na ndani ya mambo haya, kuna tu baadhi asilia, ambayo nimekuwa kuwakilishwa 1864 01:32:38,930 --> 01:32:40,180 kama kidogo masanduku. 1865 01:32:40,180 --> 01:32:42,750 1866 01:32:42,750 --> 01:32:47,980 >> Je, muundo huu DOM mti kufanya maana na nini DOM ni? 1867 01:32:47,980 --> 01:32:49,300 Basi ni nini p kusimama kwa? 1868 01:32:49,300 --> 01:32:51,850 Zaidi ya hapa, p zaidi ya hapo katika tag kwamba inawakilisha 1869 01:32:51,850 --> 01:32:54,510 aya tag katika HTML. 1870 01:32:54,510 --> 01:32:57,080 Hivyo unaweza kuangalia it up. 1871 01:32:57,080 --> 01:32:59,290 Lakini ni njia tu ni baadhi nafasi kwa baadhi maandishi. 1872 01:32:59,290 --> 01:33:02,910 Na ina baadhi ya default CSS styling, kwa sababu ni aya tag. 1873 01:33:02,910 --> 01:33:05,130 Lakini si kweli na wasiwasi juu ya sehemu ambayo sana. 1874 01:33:05,130 --> 01:33:07,510 Tu kujua ni placeholder kwa baadhi maandishi. 1875 01:33:07,510 --> 01:33:08,480 Ndiyo. 1876 01:33:08,480 --> 01:33:10,200 Swali? 1877 01:33:10,200 --> 01:33:11,021 Ndiyo. 1878 01:33:11,021 --> 01:33:12,374 >> Watazamaji: Wewe tu zilizotajwa CSS. 1879 01:33:12,374 --> 01:33:15,492 hash familia na hash mambo ambayo yote ni kimsingi 1880 01:33:15,492 --> 01:33:17,400 anayewakilisha vitambulisho katika CSS? 1881 01:33:17,400 --> 01:33:18,440 >> JOSEPH Ong: Yeah, hasa. 1882 01:33:18,440 --> 01:33:20,380 Mimi itabidi kupata nini hashes haya maana katika pili. 1883 01:33:20,380 --> 01:33:23,480 Wakati Angela akaenda juu ya CSS, yeye kuongelea CSS selectors. 1884 01:33:23,480 --> 01:33:26,770 Hizi ni selectors CSS kwamba yeye alikuwa kuzungumza juu. 1885 01:33:26,770 --> 01:33:28,268 Ndiyo, Rob? 1886 01:33:28,268 --> 01:33:32,060 >> Rob BOWDEN: Napenda pia kutoa maoni kwamba DOM ndani ya cheo tag 1887 01:33:32,060 --> 01:33:35,385 ni pia Nakala nodi. 1888 01:33:35,385 --> 01:33:36,070 >> JOSEPH Ong: Haki. 1889 01:33:36,070 --> 01:33:38,370 Hivyo ndani ya cheo tag, Mimi na baadhi ya DOM maandishi. 1890 01:33:38,370 --> 01:33:42,730 Hivyo kweli, jina hili wanapaswa kuwa na kama sanduku kidogo kuja mbali ya hilo pia. 1891 01:33:42,730 --> 01:33:45,740 Lakini haina kweli jambo sana katika kesi hii. 1892 01:33:45,740 --> 01:33:49,620 Sisi si kweli huduma ya juu nodes maandishi, kama sisi kuwaita, sana. 1893 01:33:49,620 --> 01:33:50,270 OK, sisi kufanya. 1894 01:33:50,270 --> 01:33:51,520 Inavyoonekana, sisi kufanya. 1895 01:33:51,520 --> 01:33:54,260 1896 01:33:54,260 --> 01:33:57,100 Nami kurekebisha kwamba wakati Mimi upload tena. 1897 01:33:57,100 --> 01:33:59,830 Je, hiyo mantiki? 1898 01:33:59,830 --> 01:34:01,160 >> Hivyo ni jinsi gani sisi kazi na DOM? 1899 01:34:01,160 --> 01:34:03,790 Kila kukabiliana na DOM katika JavaScript, kuna hatua mbili. 1900 01:34:03,790 --> 01:34:05,030 Kuchagua DOM hiki. 1901 01:34:05,030 --> 01:34:06,580 Na kisha kufanya mambo yake. 1902 01:34:06,580 --> 01:34:11,480 Hivyo katika kesi hii, abstractly, nimekuwa aliliteua hiki katikati. 1903 01:34:11,480 --> 01:34:14,530 Na kisha mfano wa kufanya mambo hiyo itakuwa kubadilisha Nakala. 1904 01:34:14,530 --> 01:34:16,020 Kwamba kutumika kuwa Bob. 1905 01:34:16,020 --> 01:34:19,930 Sasa, nini mimi na kama ilikuwa ni mimi iliyopita Bob kwa Milo katika kesi hii. 1906 01:34:19,930 --> 01:34:22,130 >> Hivyo ni jinsi gani sisi kwa kweli kufanya hili? 1907 01:34:22,130 --> 01:34:23,440 Tutafanyaje kuchagua? 1908 01:34:23,440 --> 01:34:26,560 Na jinsi gani hatuna kufanya mambo kwa kitu mara moja tumekuwa kuchukuliwa yake? 1909 01:34:26,560 --> 01:34:30,470 Naam, njia guys wamejifunza ni katika darasa hili ni kwa kutumia kitu sisi 1910 01:34:30,470 --> 01:34:32,420 aitwaye jQuery. 1911 01:34:32,420 --> 01:34:33,910 Kwa hiyo kile ni jQuery? 1912 01:34:33,910 --> 01:34:37,220 jQuery ni maktaba kwamba inafanya JavaScript rahisi kuandika. 1913 01:34:37,220 --> 01:34:39,500 Ili mtu alichukua muda na aliandika jQuery. 1914 01:34:39,500 --> 01:34:41,530 >> jQuery ni kweli imeandikwa katika JavaScript. 1915 01:34:41,530 --> 01:34:44,550 Na kisha kwa sababu wao alifanya hivyo, sisi sasa na rundo zima la kazi ambayo 1916 01:34:44,550 --> 01:34:46,020 tunaweza kutumia kwamba kufanya yetu anaishi kweli ni rahisi. 1917 01:34:46,020 --> 01:34:48,580 1918 01:34:48,580 --> 01:34:50,030 Kwa hiyo kile ni baadhi ya mambo ni gani? 1919 01:34:50,030 --> 01:34:51,650 Inafanya kuchagua mambo rahisi. 1920 01:34:51,650 --> 01:34:54,020 Inafanya mabadiliko ya HTML, kuongeza madarasa rahisi. 1921 01:34:54,020 --> 01:34:55,360 Inafanya Ajax rahisi. 1922 01:34:55,360 --> 01:34:58,230 Tutaweza kupata kwamba katika pili. 1923 01:34:58,230 --> 01:35:00,630 >> Na ni sawa na maktaba C. 1924 01:35:00,630 --> 01:35:03,090 Hivyo ni pamoja na string.h, kupata strlen. 1925 01:35:03,090 --> 01:35:04,680 Unaweza kupata strcpy, mambo yote haya. 1926 01:35:04,680 --> 01:35:09,650 Wakati ni pamoja na jQuery, unaweza kupata nzuri njia ya kuchagua mambo ya mabadiliko 1927 01:35:09,650 --> 01:35:10,390 mambo, na kadhalika. 1928 01:35:10,390 --> 01:35:12,990 Unaweza kupata utendaji ziada kwamba JavaScript haina kukupa. 1929 01:35:12,990 --> 01:35:15,310 Hivyo jQuery ni si JavaScript. 1930 01:35:15,310 --> 01:35:18,660 jQuery ni maktaba ambayo imeandikwa katika JavaScript kwamba inafanya JavaScript 1931 01:35:18,660 --> 01:35:20,440 rahisi kuandika. 1932 01:35:20,440 --> 01:35:23,170 >> Hivyo jQuery ni si programu lugha. 1933 01:35:23,170 --> 01:35:24,540 Lakini JavaScript ni. 1934 01:35:24,540 --> 01:35:27,420 1935 01:35:27,420 --> 01:35:27,590 kufanya. 1936 01:35:27,590 --> 01:35:30,420 Kuhakikisha kupata istilahi wako wa kulia. 1937 01:35:30,420 --> 01:35:32,490 Maswali yoyote? 1938 01:35:32,490 --> 01:35:33,882 Ndiyo. 1939 01:35:33,882 --> 01:35:35,132 Ni kwamba swali? 1940 01:35:35,132 --> 01:35:37,910 1941 01:35:37,910 --> 01:35:38,350 Sawa. 1942 01:35:38,350 --> 01:35:40,080 Hivyo ni jinsi gani kutumia jQuery? 1943 01:35:40,080 --> 01:35:42,390 Naam, wakati wewe ni kuandika baadhi JavaScript code na ni pamoja na 1944 01:35:42,390 --> 01:35:45,570 jQuery juu ya faili yako kama file script, matumizi ya ishara ya dola 1945 01:35:45,570 --> 01:35:47,310 sasa kwa kupata jQuery. 1946 01:35:47,310 --> 01:35:49,860 Na hii ni tofauti na ishara ya dola katika PHP. 1947 01:35:49,860 --> 01:35:51,590 >> Ni ishara sawa na wewe aina kwenye keyboard yako. 1948 01:35:51,590 --> 01:35:52,780 Lakini wao maana mambo mbalimbali sana. 1949 01:35:52,780 --> 01:35:56,090 Dollar ishara katika PHP maana hii ni jinsi mimi kutangaza kutofautiana. 1950 01:35:56,090 --> 01:35:59,120 Katika JavaScript, wakati umeweka ni pamoja na jQuery, anasimama kwa jQuery. 1951 01:35:59,120 --> 01:36:01,280 Hivyo kuendelea kuwa katika akili. 1952 01:36:01,280 --> 01:36:03,420 Hivyo jinsi gani sisi kuchagua DOM mambo? 1953 01:36:03,420 --> 01:36:06,500 Naam, wakati wewe kufanya hivyo ugly JavaScript njia, kupata 1954 01:36:06,500 --> 01:36:08,240 hati variable kimataifa. 1955 01:36:08,240 --> 01:36:11,170 Na kisha kupata hiki na ID ya familia. 1956 01:36:11,170 --> 01:36:15,270 Hii ni kweli kwa muda mrefu na wordy na si nzuri sana. 1957 01:36:15,270 --> 01:36:18,190 >> Au unaweza kupata mambo yote kwamba ni p tag. 1958 01:36:18,190 --> 01:36:20,080 Kwamba kazi pia katika JavaScript. 1959 01:36:20,080 --> 01:36:22,470 Lakini sisi kamwe kweli ilionyesha ninyi syntax sana. 1960 01:36:22,470 --> 01:36:24,620 Nini sisi kuonyesha mara jQuery. 1961 01:36:24,620 --> 01:36:28,720 Ili selector nzima hadi pale kwamba ilielezwa katika JavaScript anapata tu 1962 01:36:28,720 --> 01:36:33,320 kufupishwa na dola hii nzuri sana ishara alama ya familia. 1963 01:36:33,320 --> 01:36:38,480 Na $ p, tu ambapo ni kama hiyo. 1964 01:36:38,480 --> 01:36:41,690 Kama unataka kuchagua vitambulisho wote p ndani ya familia, sisi kuweka nafasi 1965 01:36:41,690 --> 01:36:42,890 kati ya mbili. 1966 01:36:42,890 --> 01:36:44,815 Na sasa, sisi kupata p wote tags ndani ya familia. 1967 01:36:44,815 --> 01:36:48,740 1968 01:36:48,740 --> 01:36:50,380 >> Na kuangalia familiar? 1969 01:36:50,380 --> 01:36:52,880 Naam, Angela kuongelea CSS selectors. 1970 01:36:52,880 --> 01:36:54,200 Nipe moja ya pili. 1971 01:36:54,200 --> 01:36:57,230 Na hivyo ili kuchagua kipengele, wewe tu kutumia kitu kimoja kama wewe 1972 01:36:57,230 --> 01:36:58,530 angefanya na CSS selector. 1973 01:36:58,530 --> 01:37:00,910 Kama kuweka hash mbele yake, ni kuchagua na ID. 1974 01:37:00,910 --> 01:37:02,220 dot teua na madarasa. 1975 01:37:02,220 --> 01:37:06,230 Kama wewe tu na kitu bila hashes au dots, ni kuchagua wale vitambulisho. 1976 01:37:06,230 --> 01:37:07,140 Maswali. 1977 01:37:07,140 --> 01:37:07,470 Ndiyo? 1978 01:37:07,470 --> 01:37:11,510 >> Watazamaji: Wakati sisi kutumia dot katika yetu HTML, ni kwamba si jQuery? 1979 01:37:11,510 --> 01:37:13,520 >> JOSEPH Ong: Dot katika HTML wetu ni kitu JavaScript. 1980 01:37:13,520 --> 01:37:14,750 Si Ni jambo jQuery. 1981 01:37:14,750 --> 01:37:17,620 njia guys kujifunza ni pamoja na jQuery ni kutumia. html. 1982 01:37:17,620 --> 01:37:21,510 Na kisha kupita chochote HTML ni kwenda kuwa. 1983 01:37:21,510 --> 01:37:23,480 Kwa hiyo nitakuwa kupata kwamba katika tu pili kweli. 1984 01:37:23,480 --> 01:37:27,800 Hivyo ni jinsi gani sisi kufanya mambo kwa hiki mara moja tumekuwa aliliteua yake? 1985 01:37:27,800 --> 01:37:30,130 Hivyo kwamba ni mfano wa kuchagua hiki. 1986 01:37:30,130 --> 01:37:32,280 Basi sasa, tunataka kufanya mambo yake. 1987 01:37:32,280 --> 01:37:35,730 >> Hivyo katika kesi hii, napenda kwenda nyuma kwa slide uliopita. 1988 01:37:35,730 --> 01:37:37,360 Ilikuwa ni Bob kabla ya. 1989 01:37:37,360 --> 01:37:40,660 Na mimi nataka mabadiliko hayo ndani ya HTML kwa Milo. 1990 01:37:40,660 --> 01:37:43,240 Hivyo mimi wito HTML kazi kutoka hiki. 1991 01:37:43,240 --> 01:37:45,580 Hiyo HTML kazi ni njia ya hiki. 1992 01:37:45,580 --> 01:37:47,430 Na kisha mimi kutoa ni nini Nataka HTML kuwa. 1993 01:37:47,430 --> 01:37:50,560 Na tu nafasi ya nini ndani ya kwamba tag na chochote mimi kuwapa. 1994 01:37:50,560 --> 01:37:50,830 Ndiyo. 1995 01:37:50,830 --> 01:37:51,170 Swali? 1996 01:37:51,170 --> 01:37:57,397 >> Watazamaji: alama hutumiwa kwa tu jQuery. 1997 01:37:57,397 --> 01:37:59,313 [Inaudible] 1998 01:37:59,313 --> 01:38:01,230 sisi bila kutumia. 1999 01:38:01,230 --> 01:38:01,960 >> JOSEPH Ong: Yeah, hasa. 2000 01:38:01,960 --> 01:38:03,750 Lakini si wasiwasi sana kuhusu safi JavaScript. 2001 01:38:03,750 --> 01:38:06,670 Mimi nataka tu wewe guys kwa kuzingatia jinsi bila kufanya hivyo kwa jQuery, kwa sababu 2002 01:38:06,670 --> 01:38:10,020 kwamba kinaendelea kuwa muhimu sehemu ya juu ya jaribio. 2003 01:38:10,020 --> 01:38:10,400 Haki. 2004 01:38:10,400 --> 01:38:10,880 Hasa. 2005 01:38:10,880 --> 01:38:16,025 Hivyo unaweza kuona kwamba alama, ili sambamba na kuchagua kipengele kwa 2006 01:38:16,025 --> 01:38:18,310 ID katikati kwa sababu ya kuwa alama. 2007 01:38:18,310 --> 01:38:19,670 Alama maana ID. 2008 01:38:19,670 --> 01:38:22,870 Na hiki hii ina ID ya katikati. 2009 01:38:22,870 --> 01:38:24,366 Hivyo kwamba ni hiki sisi kuchagua. 2010 01:38:24,366 --> 01:38:27,160 >> Watazamaji: [inaudible]. 2011 01:38:27,160 --> 01:38:31,090 ishara ya dola alama [inaudible]? 2012 01:38:31,090 --> 01:38:31,710 >> JOSEPH Ong: Hivyo hakuna. 2013 01:38:31,710 --> 01:38:33,280 swali ni je, unaweza kutumia. thamani. 2014 01:38:33,280 --> 01:38:36,445 Na thamani. Kazi tu juu ya mambo kwamba ni pembejeo. 2015 01:38:36,445 --> 01:38:40,950 2016 01:38:40,950 --> 01:38:45,495 Katika jQuery, itakuwa . Val, si. Thamani. 2017 01:38:45,495 --> 01:38:49,080 Kwa hiyo nitakuwa kupata mfano mdogo kwamba inaonyesha haya yote pamoja 2018 01:38:49,080 --> 01:38:49,850 katika pili. 2019 01:38:49,850 --> 01:38:53,130 Lakini nadhani hii mtumishi snippet kidogo mantiki watu hadi sasa. 2020 01:38:53,130 --> 01:38:55,450 Wanataka kubadili HTML, kuwaita njia HTML. 2021 01:38:55,450 --> 01:38:56,432 Ndiyo. 2022 01:38:56,432 --> 01:38:58,200 >> Watazamaji: Je, unaweza kuelezea njia tena? 2023 01:38:58,200 --> 01:39:01,900 >> JOSEPH Ong: Kwa hiyo ni njia tu kazi ambayo ni mmoja, katika hii 2024 01:39:01,900 --> 01:39:04,590 kesi, moja ya mambo haya DOM, kwa sababu unaweza kuona mimi 2025 01:39:04,590 --> 01:39:05,940 aliliteua hiki kwanza. 2026 01:39:05,940 --> 01:39:07,320 Kwa kweli, napenda kutumia panya. 2027 01:39:07,320 --> 01:39:09,330 Mimi kuchaguliwa hiki kwanza. 2028 01:39:09,330 --> 01:39:12,310 Na kisha mimi kuitwa HTML hii kazi kwamba alikuwa. 2029 01:39:12,310 --> 01:39:15,710 Na kwa sababu kazi hii ni mali ya jambo hili, sisi kuiita mbinu. 2030 01:39:15,710 --> 01:39:19,480 Hiyo tu jina dhana kwa ajili yake. 2031 01:39:19,480 --> 01:39:20,730 Kusema kwamba tena. 2032 01:39:20,730 --> 01:39:22,880 2033 01:39:22,880 --> 01:39:25,170 Basi kumbuka, sisi kuchaguliwa hiki sasa. 2034 01:39:25,170 --> 01:39:27,810 Na tumekuwa kuweka ndani ya hiki kutofautiana. 2035 01:39:27,810 --> 01:39:28,600 Sahihi? 2036 01:39:28,600 --> 01:39:34,380 >> Hivyo wakati tunataka mabadiliko ya HTML juu ya ndani, kwa sababu ilikuwa Bob kabla, 2037 01:39:34,380 --> 01:39:36,420 wanataka kubadili Nakala kwamba kwa Milo. 2038 01:39:36,420 --> 01:39:37,920 Hivyo tunatoa wito HTML. 2039 01:39:37,920 --> 01:39:41,610 Na sisi tunasema ni nini HTML ndani ya kwamba hiki lazima sasa. 2040 01:39:41,610 --> 01:39:44,107 Na hivyo mabadiliko hayo kwa Milo, kwa sababu mimi akampa Milo. 2041 01:39:44,107 --> 01:39:46,542 >> Watazamaji: Kwa hiyo wao ni kufanya kazi pamoja. 2042 01:39:46,542 --> 01:39:47,030 [Inaudible] 2043 01:39:47,030 --> 01:39:47,390 >> JOSEPH Ong: Yeah, yeah. 2044 01:39:47,390 --> 01:39:48,180 Wao ni kufanya kazi pamoja. 2045 01:39:48,180 --> 01:39:50,210 Hivyo mmoja wao teua hiki kwanza. 2046 01:39:50,210 --> 01:39:52,863 Na wa pili gani kitu hiyo. 2047 01:39:52,863 --> 01:39:53,790 Ndiyo. 2048 01:39:53,790 --> 01:39:56,168 >> Watazamaji: [inaudible]. 2049 01:39:56,168 --> 01:40:01,280 Kama njia hii ni tofauti na katika HTML una njia sawa halisi. 2050 01:40:01,280 --> 01:40:01,560 >> JOSEPH Ong: Yeah. 2051 01:40:01,560 --> 01:40:03,370 Hiyo ni njia tofauti. 2052 01:40:03,370 --> 01:40:04,670 Hiyo ni njia tofauti. 2053 01:40:04,670 --> 01:40:07,860 Na tunaweza cover kwamba katika haki ya pili wakati sisi kupata mfano. 2054 01:40:07,860 --> 01:40:12,000 Nataka kuhakikisha kwamba sisi kuharakisha kwa sababu sisi ni mbio nje ya muda. 2055 01:40:12,000 --> 01:40:15,360 Lakini tumekuwa kukimbia njia baada ya muda sasa. 2056 01:40:15,360 --> 01:40:15,490 OK. 2057 01:40:15,490 --> 01:40:16,430 Baridi. 2058 01:40:16,430 --> 01:40:20,130 Hivyo kama unataka kuongeza darasa, kuna pia ni njia ya kuongeza darasa. 2059 01:40:20,130 --> 01:40:24,300 Hii ni mfano tu wa kile unaweza kufanya na jQuery. 2060 01:40:24,300 --> 01:40:25,950 Kwamba anaongeza tu darasa. 2061 01:40:25,950 --> 01:40:28,660 >> Kama unataka kuondoa hiyo, unaweza kupiga kuondoa. 2062 01:40:28,660 --> 01:40:32,280 Hiyo tu kitu kingine unaweza kufanya. 2063 01:40:32,280 --> 01:40:35,680 Mifano hivyo zaidi ya mambo unaweza kufanya. 2064 01:40:35,680 --> 01:40:37,510 Hivyo naweza tu kuiweka katika juu kama hii? 2065 01:40:37,510 --> 01:40:38,760 Mdogo kuondoa. 2066 01:40:38,760 --> 01:40:42,470 2067 01:40:42,470 --> 01:40:45,930 Kama mimi tu kutekeleza kwamba JavaScript katika juu ya faili wangu, kwamba kazi? 2068 01:40:45,930 --> 01:40:48,540 2069 01:40:48,540 --> 01:40:48,920 Haki. 2070 01:40:48,920 --> 01:40:50,530 Kwa sababu katikati haipo bado. 2071 01:40:50,530 --> 01:40:51,840 Hivyo hii ni si kwenda kufanya kazi. 2072 01:40:51,840 --> 01:40:52,800 Utekelezaji utaratibu. 2073 01:40:52,800 --> 01:40:55,040 Unaendelea juu ya kwanza. 2074 01:40:55,040 --> 01:40:55,540 Nini? 2075 01:40:55,540 --> 01:40:57,450 >> Watazamaji: mdogo haipo bado? 2076 01:40:57,450 --> 01:40:57,810 >> JOSEPH Ong: Yeah. 2077 01:40:57,810 --> 01:40:58,710 Mdogo haipo bado. 2078 01:40:58,710 --> 01:40:59,600 Hasa. 2079 01:40:59,600 --> 01:41:01,320 >> Watazamaji: Ulisema katikati. 2080 01:41:01,320 --> 01:41:01,510 >> JOSEPH Ong: Sorry. 2081 01:41:01,510 --> 01:41:02,720 Mdogo haipo bado. 2082 01:41:02,720 --> 01:41:04,510 Na kitu kingine ni mimi na si pamoja na jQuery 2083 01:41:04,510 --> 01:41:06,580 faili kuuliza script src. 2084 01:41:06,580 --> 01:41:07,960 Hivyo kwamba si kwenda kufanya kazi. 2085 01:41:07,960 --> 01:41:09,580 Kwa kweli, mimi hakufanya hivyo katika slide ya pili, ambayo ni 2086 01:41:09,580 --> 01:41:10,700 wanatakiwa kurekebisha kuwa ama. 2087 01:41:10,700 --> 01:41:14,120 Lakini njia ya sisi kufanya hii ni JavaScript ni tukio inaendeshwa. 2088 01:41:14,120 --> 01:41:17,410 Hivyo kile sisi kufanya ni sisi kutumia tukio la handler kwa kufanya hili kutokea. 2089 01:41:17,410 --> 01:41:19,510 Na hivyo mimi kuchagua hati kuweka kwanza. 2090 01:41:19,510 --> 01:41:23,810 Mimi kusema, OK, wakati hati ni tayari, napenda kukimbia kazi. 2091 01:41:23,810 --> 01:41:25,470 Hivyo hiyo ni kwamba syntax njia zote. 2092 01:41:25,470 --> 01:41:27,100 >> Mimi kuchaguliwa hati. 2093 01:41:27,100 --> 01:41:29,530 Sasa, wakati hati ni tayari, kukimbia kazi. 2094 01:41:29,530 --> 01:41:32,970 Na hivyo juu ya hapa wakati hati ni tayari, ambayo ina maana HTML yote ina 2095 01:41:32,970 --> 01:41:36,140 kubeba, basi mimi kukimbia kazi kwamba kuondosha kwamba hiki. 2096 01:41:36,140 --> 01:41:40,270 Na hivyo kwa sasa, wakati mimi kukimbia kazi hii kwamba mimi kupita katika tayari, mimi nina 2097 01:41:40,270 --> 01:41:43,780 uhakika kwamba HTML yote juu ya ukurasa ni kwenda kuwepo kwanza. 2098 01:41:43,780 --> 01:41:44,100 Ndiyo. 2099 01:41:44,100 --> 01:41:44,425 Swali? 2100 01:41:44,425 --> 01:41:48,200 >> Watazamaji: ni tukio keyword nini ndani ya kazi? 2101 01:41:48,200 --> 01:41:51,750 >> JOSEPH Ong: Hivyo kwamba tukio keyword katika kazi ni parameter kwamba 2102 01:41:51,750 --> 01:41:53,490 anapata kupita kwa kazi kwa tukio lolote. 2103 01:41:53,490 --> 01:41:55,470 Ni jambo tu kwamba kupata kwa bure. 2104 01:41:55,470 --> 01:41:59,320 Wakati unatumia handlers muhimu katika pset8, tukio hilo kuwa naweza kukuambia, kwa 2105 01:41:59,320 --> 01:42:01,350 mfano, ambayo muhimu taabu juu. 2106 01:42:01,350 --> 01:42:05,540 Katika kesi hiyo, kwa ajili ya tukio tayari, ni kweli si super muhimu. 2107 01:42:05,540 --> 01:42:08,640 Lakini kwa tukio muhimu chini, ni zaidi muhimu, kwa sababu ya kupata kujua ambayo 2108 01:42:08,640 --> 01:42:12,330 muhimu taabu kwa kupata muhimu code mbali kwamba tukio kitu. 2109 01:42:12,330 --> 01:42:13,530 Sahihi? 2110 01:42:13,530 --> 01:42:15,160 Je, hiyo mantiki? 2111 01:42:15,160 --> 01:42:16,280 OK. 2112 01:42:16,280 --> 01:42:16,580 Ndiyo. 2113 01:42:16,580 --> 01:42:17,150 Swali? 2114 01:42:17,150 --> 01:42:19,290 >> Watazamaji: Hivyo unaweza kuweka tag script chini chini? 2115 01:42:19,290 --> 01:42:19,940 >> JOSEPH Ong: Hivyo yeah. 2116 01:42:19,940 --> 01:42:21,500 Unaweza kuweka script tag chini chini. 2117 01:42:21,500 --> 01:42:23,090 Lakini basi tu inakuwa kweli messy. 2118 01:42:23,090 --> 01:42:26,590 Na sisi kama kuvifanya wote ya kanuni zetu katika sehemu moja. 2119 01:42:26,590 --> 01:42:28,290 Na hii itaruhusu yetu kufanya hivyo. 2120 01:42:28,290 --> 01:42:32,010 Kumbuka kabla ya hapo nilikuwa alisema kuna nicer njia ya kuhakikisha kwamba mambo ni 2121 01:42:32,010 --> 01:42:33,880 juu ya ukurasa kabla ya kutekeleza kanuni? 2122 01:42:33,880 --> 01:42:36,079 Na hii ni njia nzuri ya ungependa kukamilisha hilo. 2123 01:42:36,079 --> 01:42:37,329 >> Watazamaji: [inaudible]. 2124 01:42:37,329 --> 01:42:41,710 2125 01:42:41,710 --> 01:42:42,230 >> JOSEPH Ong: Yeah. 2126 01:42:42,230 --> 01:42:43,460 Ungependa bado, sawa? 2127 01:42:43,460 --> 01:42:46,930 Kwa sababu kumbuka, ni pamoja na faili juu ya ukurasa. 2128 01:42:46,930 --> 01:42:49,890 Hivyo ni kwenda kutekeleza kwanza kabla ya kupata chini ya ukurasa. 2129 01:42:49,890 --> 01:42:54,600 2130 01:42:54,600 --> 01:42:55,180 OK. 2131 01:42:55,180 --> 01:42:59,210 Hivyo unaweza pia kuongeza mbalimbali aina ya tukio handler. 2132 01:42:59,210 --> 01:43:00,640 Hii moja tu michakato ya Clicks. 2133 01:43:00,640 --> 01:43:03,910 Wakati mimi bonyeza mdogo, kisha itakuwa pop up na tahadhari. 2134 01:43:03,910 --> 01:43:05,440 Hii ni tofauti aina ya tukio hilo. 2135 01:43:05,440 --> 01:43:08,840 Kinyume na tukio tayari, sasa kutumia tukio la click wakati kupokea 2136 01:43:08,840 --> 01:43:10,190 Clicks hiki. 2137 01:43:10,190 --> 01:43:13,860 >> Na hivyo katika kesi hii, kumbuka, click handler ni masharti ya mdogo. 2138 01:43:13,860 --> 01:43:16,080 Hivyo hutokea tu wakati Mimi bonyeza mdogo. 2139 01:43:16,080 --> 01:43:19,510 Na katika nyingine moja, tukio tayari masharti ya waraka huo. 2140 01:43:19,510 --> 01:43:23,750 Hivyo ni kusubiri kwa hati kuwa tayari. 2141 01:43:23,750 --> 01:43:25,120 Mantiki? 2142 01:43:25,120 --> 01:43:26,190 Nadhani unaweza kusonga mbele. 2143 01:43:26,190 --> 01:43:26,610 Ndiyo. 2144 01:43:26,610 --> 01:43:26,980 Swali? 2145 01:43:26,980 --> 01:43:28,230 >> Watazamaji: [inaudible]. 2146 01:43:28,230 --> 01:43:31,676 2147 01:43:31,676 --> 01:43:33,620 katika kesi hii kutumia [inaudible]. 2148 01:43:33,620 --> 01:43:36,650 >> JOSEPH Ong: Oh, yeah, kwa sababu katika hii kesi, mimi kusubiri kwa ajili ya mdogo 2149 01:43:36,650 --> 01:43:40,740 hiki kuonekana kwenye screen kwanza kabla ya mimi watachomeka click handler kwa 2150 01:43:40,740 --> 01:43:43,062 yake, ambayo ni kwa nini mimi kuiweka ndani ya ya hati tayari. 2151 01:43:43,062 --> 01:43:45,780 2152 01:43:45,780 --> 01:43:46,840 OK. 2153 01:43:46,840 --> 01:43:52,390 Na wa pili, hivyo hii ni mfano kubwa ya jinsi gani kuchanganya kila kitu. 2154 01:43:52,390 --> 01:43:55,930 Hii ni aina tu uthibitisho mfano ve kuonekana katika hotuba. 2155 01:43:55,930 --> 01:43:58,410 Hivyo kuchukua hatua kwa hatua kama kwenda kwa njia hii. 2156 01:43:58,410 --> 01:43:59,590 Na itakuwa kabisa OK. 2157 01:43:59,590 --> 01:44:01,400 Tu kusoma kutoka juu hadi chini. 2158 01:44:01,400 --> 01:44:03,030 >> Nina fomu chini. 2159 01:44:03,030 --> 01:44:07,590 Wakati hati ni tayari, mimi ambatisha kuwasilisha handler kwa aina, kama kwamba 2160 01:44:07,590 --> 01:44:12,910 wakati mimi kuwasilisha fomu, mimi kupata maadili ndani ya kila mmoja wa pembejeo hizo. 2161 01:44:12,910 --> 01:44:14,560 Na mimi kuangalia kama ni tupu. 2162 01:44:14,560 --> 01:44:17,090 Kama ni tupu, mimi kurudi uongo, kwa sababu Sitaki kuwasilisha fomu, 2163 01:44:17,090 --> 01:44:18,950 kwa sababu fomu ni sahihi. 2164 01:44:18,950 --> 01:44:22,040 Kama password ni tupu au ni chini zaidi ya herufi nane, mimi si kuwasilisha 2165 01:44:22,040 --> 01:44:24,470 fomu, kwa sababu hiyo pia makosa. 2166 01:44:24,470 --> 01:44:28,150 Na kurudi uongo tu kuzuia fomu kutoka kwa kuwasilisha na 2167 01:44:28,150 --> 01:44:30,150 kwenda ukurasa mpya. 2168 01:44:30,150 --> 01:44:31,310 >> Na hopefully, hii ina maana. 2169 01:44:31,310 --> 01:44:34,650 Nadhani guys lazima kutembea kwa njia ya kanuni hii hatua kwa hatua juu yako mwenyewe. 2170 01:44:34,650 --> 01:44:38,350 Na mara moja wewe kuelewa nini kuchagua mambo na kufanya mambo yake 2171 01:44:38,350 --> 01:44:40,520 kweli unahusu, hii itafanya mengi ya maana na wewe. 2172 01:44:40,520 --> 01:44:41,295 Ndiyo? 2173 01:44:41,295 --> 01:44:44,150 >> Watazamaji: Nini maana jina = jina la mtumiaji maana yake nini? 2174 01:44:44,150 --> 01:44:48,530 >> JOSEPH Ong: Kwa hiyo jina = jina la mtumiaji na jina = password tu ina maana kuangalia 2175 01:44:48,530 --> 01:44:50,730 sifa ya chochote wewe ni kuchagua. 2176 01:44:50,730 --> 01:44:51,790 Na kisha ambayo ina mechi. 2177 01:44:51,790 --> 01:44:53,870 Kwa hiyo sisi kwenda katika usajili. 2178 01:44:53,870 --> 01:44:56,240 Na kisha sisi kuangalia pembejeo zote na usajili. 2179 01:44:56,240 --> 01:44:59,990 Na kisha sisi kuchukua moja ambapo jina sifa ni sawa na jina la mtumiaji. 2180 01:44:59,990 --> 01:45:04,040 Ili selector kwanza kuchagua tu jina la mtumiaji pembejeo. 2181 01:45:04,040 --> 01:45:08,220 Na kwamba selector pili teua tu password moja, kwa sababu wale na 2182 01:45:08,220 --> 01:45:12,240 sifa jina wao kuweka kama nini wao ni walidhani kuwa. 2183 01:45:12,240 --> 01:45:12,575 Swali? 2184 01:45:12,575 --> 01:45:17,030 >> Watazamaji: On kuwasilisha, jinsi gani chini sehemu kutatua sehemu ya juu? 2185 01:45:17,030 --> 01:45:19,350 >> JOSEPH Ong: Basi hiyo ni kwa sababu ya tukio handler. 2186 01:45:19,350 --> 01:45:23,000 Hivyo tunasubiri kwa kuwasilisha tukio kwamba anapata kufukuzwa aina. 2187 01:45:23,000 --> 01:45:24,730 Na kwamba wote kwamba ni Waislamu. 2188 01:45:24,730 --> 01:45:26,080 Kwa nini mimi wito kuwasilisha huko up? 2189 01:45:26,080 --> 01:45:28,870 Ni anasema, wakati fomu ni in, Mimi kupata kuwasilisha tukio hilo. 2190 01:45:28,870 --> 01:45:33,480 Hivyo basi mimi tu kukatiza kuwa na kisha kukimbia kanuni hii badala yake. 2191 01:45:33,480 --> 01:45:33,823 Ndiyo? 2192 01:45:33,823 --> 01:45:35,866 >> Watazamaji: Kwa nini una kwa kuwa tukio kazi? 2193 01:45:35,866 --> 01:45:38,580 Kwa nini hawawezi wewe tu [inaudible]? 2194 01:45:38,580 --> 01:45:41,140 >> JOSEPH Ong: Kwa sababu katika JavaScript, wewe na kutangaza kazi. 2195 01:45:41,140 --> 01:45:42,910 Hiyo tu jinsi kazi katika JavaScript. 2196 01:45:42,910 --> 01:45:44,800 Una kusema ni kwenda kuendesha kazi. 2197 01:45:44,800 --> 01:45:47,290 Hivyo wewe ni kuwaambia ni kwamba wewe ni wanatarajia kazi hapa badala ya 2198 01:45:47,290 --> 01:45:48,260 tu curly braces. 2199 01:45:48,260 --> 01:45:50,460 >> Watazamaji: Na kazi ni chochote ifuatavyo? 2200 01:45:50,460 --> 01:45:50,650 >> JOSEPH Ong: Yeah. 2201 01:45:50,650 --> 01:45:52,790 kazi ni chochote ni ndani ya braces curly baada ya 2202 01:45:52,790 --> 01:45:53,630 kwamba kazi ya keyword. 2203 01:45:53,630 --> 01:45:54,045 Ndiyo? 2204 01:45:54,045 --> 01:45:55,295 >> Watazamaji: [inaudible]. 2205 01:45:55,295 --> 01:46:00,180 2206 01:46:00,180 --> 01:46:00,660 >> JOSEPH Ong: Kwa Waislamu? 2207 01:46:00,660 --> 01:46:03,520 >> Watazamaji: Hapana, kwa ajili ya kazi bila ya tukio hilo. 2208 01:46:03,520 --> 01:46:03,770 >> JOSEPH Ong: Yeah. 2209 01:46:03,770 --> 01:46:05,610 Hivyo bila ya tukio hilo, unaweza kuwa na hiyo. 2210 01:46:05,610 --> 01:46:08,480 Kama huna haja ya tukio hilo, basi unaweza tu omit yake. 2211 01:46:08,480 --> 01:46:12,220 Lakini kama wewe kufanya, basi tu ya kuweka huko. 2212 01:46:12,220 --> 01:46:12,520 Ndiyo. 2213 01:46:12,520 --> 01:46:13,190 Haraka swali? 2214 01:46:13,190 --> 01:46:14,440 >> Watazamaji: [inaudible]. 2215 01:46:14,440 --> 01:46:21,170 2216 01:46:21,170 --> 01:46:21,440 >> JOSEPH Ong: Yeah. 2217 01:46:21,440 --> 01:46:24,550 Kwa sababu unahitaji nini cha kufanya, document.ready tu anasema kusubiri kwa ajili ya wote 2218 01:46:24,550 --> 01:46:26,540 HTML kwenye ukurasa wa mzigo kwanza. 2219 01:46:26,540 --> 01:46:30,510 Na kwa kawaida, unataka mambo yako katika mahali kabla ya kukimbia code yoyote. 2220 01:46:30,510 --> 01:46:31,030 Sawa. 2221 01:46:31,030 --> 01:46:32,180 Sisi na kupata Ajax. 2222 01:46:32,180 --> 01:46:33,110 Hatuna muda mwingi. 2223 01:46:33,110 --> 01:46:35,170 Hivyo faida na hasara. 2224 01:46:35,170 --> 01:46:37,450 JavaScript ni rahisi kujaribu kuandika na jQuery. 2225 01:46:37,450 --> 01:46:38,930 Lakini jQuery ni aina ya polepole. 2226 01:46:38,930 --> 01:46:42,290 >> Ni kama PHP ni polepole zaidi kuliko C, kwa sababu ni kufasiriwa. 2227 01:46:42,290 --> 01:46:45,690 Na jQuery ni kidogo polepole zaidi kuliko JavaScript, kwa sababu anafanya mengi ya 2228 01:46:45,690 --> 01:46:46,630 mambo chini ya kofia. 2229 01:46:46,630 --> 01:46:48,660 Na hivyo kama unatumia jQuery, ni kidogo tu polepole zaidi kuliko 2230 01:46:48,660 --> 01:46:51,630 JavaScript, hata kama ni anatoa nzuri ulimbwende. 2231 01:46:51,630 --> 01:46:53,970 Na hatimaye, Ajax. 2232 01:46:53,970 --> 01:46:59,170 Hivyo mbali na Ajax, hawajaona Ajax katika suala la pset7 bado, kwa sababu 2233 01:46:59,170 --> 01:47:01,150 wakati wa kufanya, kuwasilisha fomu ya kunukuu. 2234 01:47:01,150 --> 01:47:02,350 Ni mizigo ukurasa mpya. 2235 01:47:02,350 --> 01:47:04,440 Ili kupata hii kubwa nyeupe flash juu ya ukurasa wakati kwamba 2236 01:47:04,440 --> 01:47:06,820 ukurasa wa pili mizigo, sahihi? 2237 01:47:06,820 --> 01:47:08,780 >> Itakuwa kweli nzuri kama wewe hawakuwa na flash hii. 2238 01:47:08,780 --> 01:47:11,600 Kama Facebook, kama wewe tu kitabu kwa chini, inaongeza mambo mapya 2239 01:47:11,600 --> 01:47:13,490 bila refreshing ukurasa mzima. 2240 01:47:13,490 --> 01:47:15,420 Hivyo kitu kama hii itakuwa nzuri. 2241 01:47:15,420 --> 01:47:17,370 Hii ni JavaScript code upande wa kushoto. 2242 01:47:17,370 --> 01:47:19,390 Unaweza kupata nini ni ndani ya pembejeo kwamba. 2243 01:47:19,390 --> 01:47:21,340 Unaweza kupata hisa maelezo kutoka Yahoo! 2244 01:47:21,340 --> 01:47:27,440 Na kisha kufanya kamba kubwa kwamba anasema, OK, huu ni ujumbe nataka 2245 01:47:27,440 --> 01:47:28,400 kuonyesha kwenye screen. 2246 01:47:28,400 --> 01:47:32,280 Na kisha kuweka ujumbe kwamba ndani ya baadhi ya hiki HTML kwamba anapata 2247 01:47:32,280 --> 01:47:33,970 kuonyeshwa kwenye screen. 2248 01:47:33,970 --> 01:47:35,540 >> Hivyo kwamba ni yote yale yanayotokea hapa. 2249 01:47:35,540 --> 01:47:39,410 Hivyo kimsingi, kwa sababu hii yote ni JavaScript na huna haja ya kuendesha 2250 01:47:39,410 --> 01:47:42,980 tena PHP, hii kuhakikisha kwamba ukurasa haina mahitaji. 2251 01:47:42,980 --> 01:47:47,470 Hivyo hii ni wazo tu abstract kwamba mimi kusema hapa kwa sasa. 2252 01:47:47,470 --> 01:47:50,630 wazo abstract ni kwamba kama wewe kufanya hivyo wote katika JavaScript, huna 2253 01:47:50,630 --> 01:47:52,330 ukurasa mahitaji. 2254 01:47:52,330 --> 01:47:53,800 Lakini jinsi gani unaweza kweli kufanya hili? 2255 01:47:53,800 --> 01:47:56,230 >> Vizuri, kwa kweli, hebu majadiliano juu ya tatizo na hii ya kwanza. 2256 01:47:56,230 --> 01:47:59,340 Tatizo ni katika JavaScript, utekelezaji ni synchronous. 2257 01:47:59,340 --> 01:48:02,000 Hivyo kuwa na kusubiri kwa moja line kumaliza kabla ya 2258 01:48:02,000 --> 01:48:03,370 kutekeleza line ijayo. 2259 01:48:03,370 --> 01:48:06,130 Na nini kama mimi nina kwenda juu ya Yahoo!, na server yao ni kweli polepole, na 2260 01:48:06,130 --> 01:48:08,790 inachukua yao sekunde tatu kwa nipe nyuma kwamba hisa info? 2261 01:48:08,790 --> 01:48:12,620 Wakati mimi hit kwamba line bei, kama utekelezaji ni synchronous, kama ni kwa 2262 01:48:12,620 --> 01:48:15,390 default, ni nini tu kwenda kufanya ni ya browser yako ni kwenda duka kwa 2263 01:48:15,390 --> 01:48:15,930 sekunde tatu. 2264 01:48:15,930 --> 01:48:18,900 Na wewe si kwenda kuwa na uwezo wa kufanya kitu chochote wakati anapata data hiyo. 2265 01:48:18,900 --> 01:48:20,010 Ni kinaendelea kuwa hao. 2266 01:48:20,010 --> 01:48:20,800 >> Na kwamba ni mbaya. 2267 01:48:20,800 --> 01:48:23,390 Hawataki mtumiaji na waliohifadhiwa mtandao ukurasa. 2268 01:48:23,390 --> 01:48:24,170 Sahihi? 2269 01:48:24,170 --> 01:48:25,480 Hiyo ni mbaya tu. 2270 01:48:25,480 --> 01:48:26,770 Kila mmoja anakubali? 2271 01:48:26,770 --> 01:48:29,270 Kama wewe ni kuvinjari Facebook na huganda na huwezi kufanya kitu chochote, 2272 01:48:29,270 --> 01:48:31,920 kupata kweli kuchanganyikiwa. 2273 01:48:31,920 --> 01:48:34,960 Hivyo ufumbuzi ni sisi kufanya kitu Asynchronous badala yake. 2274 01:48:34,960 --> 01:48:38,910 Hivyo jambo hili wote Asynchronous anasema ni, mimi naenda kuuliza hii 2275 01:48:38,910 --> 01:48:40,280 URL kwa baadhi ya data. 2276 01:48:40,280 --> 01:48:41,610 Na kisha mimi nina kwenda kuendelea. 2277 01:48:41,610 --> 01:48:45,330 Mimi tu kwenda kuweka utekelezaji chochote kificho kwamba alikuwa baada ya hapo. 2278 01:48:45,330 --> 01:48:49,290 >> Na kisha wakati wowote data kwamba ni tayari, basi mimi mchakato yake. 2279 01:48:49,290 --> 01:48:50,540 Hayo ni yote ni akisema. 2280 01:48:50,540 --> 01:48:52,795 2281 01:48:52,795 --> 01:48:56,710 >> Watazamaji: Ajax tu hufanya code Asynchronous? 2282 01:48:56,710 --> 01:48:58,560 >> JOSEPH Ong: Ni asynchronous njia ya data kuchota. 2283 01:48:58,560 --> 01:49:01,230 Hivyo jambo la kwanza kuhusu Ajax ni lets mimi kupata data 2284 01:49:01,230 --> 01:49:03,170 kutoka kwenye tovuti ya nje. 2285 01:49:03,170 --> 01:49:07,045 Na jambo la pili ni inafanya uhakika kwamba ukurasa wangu hana duka wakati mimi nina 2286 01:49:07,045 --> 01:49:07,970 kuchota data hiyo. 2287 01:49:07,970 --> 01:49:09,600 Hiyo ni sehemu Asynchronous yake. 2288 01:49:09,600 --> 01:49:13,040 Kwa sababu huenda mbali mahali pengine, kwa sababu mimi kusema kuendelea juu ya wakati 2289 01:49:13,040 --> 01:49:14,900 ni kuchota data hiyo, ya kwamba inafanya Asynchronous. 2290 01:49:14,900 --> 01:49:17,170 Mimi kuweka utekelezaji. 2291 01:49:17,170 --> 01:49:18,960 >> Hivyo kuendelea kuwa asynchronous wazo katika akili. 2292 01:49:18,960 --> 01:49:22,010 Na mimi itabidi kuonyesha nini tofauti ni. 2293 01:49:22,010 --> 01:49:23,920 toleo synchronous ni upande wa kushoto. 2294 01:49:23,920 --> 01:49:26,240 toleo asynchronous ni upande wa kulia. 2295 01:49:26,240 --> 01:49:29,170 Kuangalia idadi kuona ambayo hatua yanahusiana na nini 2296 01:49:29,170 --> 01:49:30,610 executes katika kila mstari. 2297 01:49:30,610 --> 01:49:32,730 Zaidi ya hapo, tahadhari inaonyesha juu kwanza. 2298 01:49:32,730 --> 01:49:34,590 Kwa sababu ya kupata hisa maelezo kutoka Yahoo! 2299 01:49:34,590 --> 01:49:37,250 inachukua sekunde tatu, maduka kwa sekunde tatu. 2300 01:49:37,250 --> 01:49:39,880 Na kisha alerts bei baada ya sekunde wale watatu. 2301 01:49:39,880 --> 01:49:43,690 >> Basi sasa, kwamba macho inaonyesha hadi saa wakati huo - 2302 01:49:43,690 --> 01:49:44,610 sekunde tatu in 2303 01:49:44,610 --> 01:49:47,670 Na kisha alerts na baada ya hapo. 2304 01:49:47,670 --> 01:49:48,930 Hivyo huenda tu hatua kwa hatua. 2305 01:49:48,930 --> 01:49:51,200 Ni kama nini guys wangeweza kukubali, sahihi? 2306 01:49:51,200 --> 01:49:54,170 Pamoja na Asynchronous utekelezaji, ninyi macho ya kwanza. 2307 01:49:54,170 --> 01:49:57,410 Basi kwenda mbali na URL hii. 2308 01:49:57,410 --> 01:49:59,530 Na kusema, mimi nina kwenda kuuliza tu kwa data. 2309 01:49:59,530 --> 01:50:01,170 Na kisha mimi nina kwenda mchakato wa baadaye. 2310 01:50:01,170 --> 01:50:04,230 Hivyo mara moja executes mstari wa pili baada ya mimi kufanya 2311 01:50:04,230 --> 01:50:05,710 Asynchronous ombi. 2312 01:50:05,710 --> 01:50:08,920 >> Hivyo sekunde 0.001, unaweza kuona macho hi. 2313 01:50:08,920 --> 01:50:10,960 Kutekeleza kwamba kazi, macho bye. 2314 01:50:10,960 --> 01:50:14,240 Na kwa sababu mimi alitoa ahadi kwamba mimi ingekuwa mchakato data baadaye, nini 2315 01:50:14,240 --> 01:50:17,920 hutokea ni wakati data kwamba anakuja nyuma sekunde tatu baadaye, basi mimi kukimbia kwamba 2316 01:50:17,920 --> 01:50:21,380 kazi ambayo nina zaidi ya hapo. 2317 01:50:21,380 --> 01:50:21,870 Ndiyo? 2318 01:50:21,870 --> 01:50:25,750 >> Watazamaji: Je, wewe taja au kufafanua nini Ajax inamaanisha nini? 2319 01:50:25,750 --> 01:50:30,460 >> JOSEPH Ong: Kwa hiyo Ajax ni njia kwamba kama mimi haja data wakati mimi niko kwenye tovuti na mimi 2320 01:50:30,460 --> 01:50:34,690 hawataki mahitaji ukurasa, basi Mimi kutumia teknolojia ya hii inayoitwa Ajax. 2321 01:50:34,690 --> 01:50:40,630 Kwamba kimsingi ina maana, kwenda kuchota data kutoka tovuti nyingine. 2322 01:50:40,630 --> 01:50:43,724 Na kufanya hivyo kwa njia tu kwamba haina duka mtandao ukurasa wangu. 2323 01:50:43,724 --> 01:50:46,650 >> Watazamaji: Hivyo ni kwamba asili sehemu ya JavaScript au jQuery? 2324 01:50:46,650 --> 01:50:50,590 >> JOSEPH Ong: Kwa hiyo mtu aliandika njia ya kufanya hii katika JavaScript muda mrefu uliopita. 2325 01:50:50,590 --> 01:50:52,050 Katika hatua moja, haikuwepo. 2326 01:50:52,050 --> 01:50:56,630 Na hivyo mtu zuliwa mbinu hii kuruhusu watu kuomba data hii 2327 01:50:56,630 --> 01:50:57,680 kwa mtindo huu. 2328 01:50:57,680 --> 01:50:59,550 Na waliandika baadhi ya mambo kufanya hivyo kwa ajili yenu. 2329 01:50:59,550 --> 01:51:01,605 Na jQuery tu inakupa hii nzuri sana njia ya kufanya hivyo 2330 01:51:01,605 --> 01:51:03,112 na $ hii. kupata kazi. 2331 01:51:03,112 --> 01:51:07,200 2332 01:51:07,200 --> 01:51:09,480 maswali? 2333 01:51:09,480 --> 01:51:11,560 Siwezi kujibu maswali kuhusu Ajax baadaye pia. 2334 01:51:11,560 --> 01:51:13,870 Mimi nitakuwa hapa. 2335 01:51:13,870 --> 01:51:16,390 >> Hivyo hebu sisi kuchota data bila refreshing ukurasa. 2336 01:51:16,390 --> 01:51:18,200 Na hebu sisi kufanya hivyo katika njia Asynchronous kwamba 2337 01:51:18,200 --> 01:51:19,450 haina kufungia ukurasa. 2338 01:51:19,450 --> 01:51:22,680 2339 01:51:22,680 --> 01:51:27,310 Muda mrefu sana, hakuwa na kusoma kama kwamba maelezo mara muda mrefu sana kwa ajili yenu. 2340 01:51:27,310 --> 01:51:29,430 Hivyo hatimaye, msalaba-site scripting mashambulizi. 2341 01:51:29,430 --> 01:51:30,910 Tuliona huu kwa Zamyla. 2342 01:51:30,910 --> 01:51:34,285 Kama katika database yangu mtu ana jina hili, ambayo ni hii tag script, na mimi 2343 01:51:34,285 --> 01:51:38,280 na baadhi ya kanuni juu ya ukurasa yangu kwamba prints nje majina ya watu katika mstari, au mimi 2344 01:51:38,280 --> 01:51:43,310 baadhi JavaScript kificho kwamba kuwekeza jina hili katika ukurasa, 2345 01:51:43,310 --> 01:51:45,680 nini HTML anapata zinazozalishwa? 2346 01:51:45,680 --> 01:51:47,290 Naam, mimi magazeti nje HTML tag. 2347 01:51:47,290 --> 01:51:48,390 Mimi magazeti nje haya tags wote. 2348 01:51:48,390 --> 01:51:50,740 >> Mimi kupata sehemu ambapo mimi nina uchapishaji nje na marafiki zangu. 2349 01:51:50,740 --> 01:51:52,980 Mimi magazeti Lauren nje. 2350 01:51:52,980 --> 01:51:54,200 Ni magazeti Milo nje. 2351 01:51:54,200 --> 01:51:56,810 Na kisha jina langu katika orodha ya ni script baada ya 2352 01:51:56,810 --> 01:51:58,060 unflattering Facebook sasa. 2353 01:51:58,060 --> 01:52:00,740 2354 01:52:00,740 --> 01:52:04,330 Kwa sababu mimi kuingizwa hii katika ukurasa kwa sababu inaonekana kama JavaScript, wakati 2355 01:52:04,330 --> 01:52:07,930 ukurasa hii anapata alimtuma user, anapata kunyongwa kama JavaScript. 2356 01:52:07,930 --> 01:52:10,800 Na hivyo hii ni kile tunachokiita msalaba-site scripting shambulio hilo. 2357 01:52:10,800 --> 01:52:14,570 Mtu unaweka habari malicious katika Mbegu yako ambayo inaweza yanahusiana na 2358 01:52:14,570 --> 01:52:17,080 baadhi kamba ya ziada au baadhi kamba JavaScript. 2359 01:52:17,080 --> 01:52:20,130 >> Na wakati anapata kuchapishwa kwa ukurasa kwa mtindo huu, basi 2360 01:52:20,130 --> 01:52:22,580 kinachotokea ni kwamba kanuni mbaya anapata kunyongwa kwamba sikuwa na nia ya 2361 01:52:22,580 --> 01:52:25,110 kwa kuwa na kupata kuuawa. 2362 01:52:25,110 --> 01:52:28,230 Na kwamba wote msalaba-site scripting mashambulizi ni. 2363 01:52:28,230 --> 01:52:31,790 Na njia ya kupata karibu hii ni kama Zamyla alisema. 2364 01:52:31,790 --> 01:52:34,340 Wewe tu kufuta mambo katika HTML maalum chars. 2365 01:52:34,340 --> 01:52:39,460 Na hii HTML chars maalum ni PHP kazi ambayo kuzuia aina hii 2366 01:52:39,460 --> 01:52:42,000 ya kitu kutoka yanatokea kwenu kama una malicious 2367 01:52:42,000 --> 01:52:43,830 kamba katika orodha yako. 2368 01:52:43,830 --> 01:52:47,650 Ni tu epuka, hivyo kwamba hana kupata kutafsiriwa kama HTML. 2369 01:52:47,650 --> 01:52:50,960 Ni nafasi ya mabano kidogo na kile tunachokiita vyombo. 2370 01:52:50,960 --> 01:52:52,250 Na sisi akaenda juu ya hili katika hotuba pia. 2371 01:52:52,250 --> 01:52:55,800 Hivyo nadhani nyie wanapaswa kuwa na kufahamu nzuri juu ya hilo. 2372 01:52:55,800 --> 01:52:57,420 Maswali? 2373 01:52:57,420 --> 01:52:57,820 Ndiyo. 2374 01:52:57,820 --> 01:53:00,860 >> Watazamaji: Hivyo ni jinsi gani [Inaudible]? 2375 01:53:00,860 --> 01:53:01,555 >> JOSEPH Ong: Sema tena. 2376 01:53:01,555 --> 01:53:02,500 >> Watazamaji: Ni kwa jinsi gani kufuatilia - 2377 01:53:02,500 --> 01:53:02,860 >> JOSEPH Ong: Haki. 2378 01:53:02,860 --> 01:53:06,080 Hivyo kuwa na kitu ambacho anasema, wakati Mimi kujiandikisha, aina ya jina langu. 2379 01:53:06,080 --> 01:53:09,390 I just aina katika shamba hilo, jina langu ni stript baada ya unflattering Facebook 2380 01:53:09,390 --> 01:53:11,570 hali ya karibu script tag. 2381 01:53:11,570 --> 01:53:15,690 Na kwamba tu anapata kuweka katika database, kwa sababu siwezi kusema mtu 2382 01:53:15,690 --> 01:53:18,260 katika dunia haina jina na mshale wa kushoto katika au 2383 01:53:18,260 --> 01:53:19,036 neno script ndani yake. 2384 01:53:19,036 --> 01:53:21,330 Kwamba si kweli mantiki. 2385 01:53:21,330 --> 01:53:24,560 Hivyo mimi tu na kuhakikisha kwamba mimi kumsafisha mambo kabla ya mimi magazeti 2386 01:53:24,560 --> 01:53:25,420 nje kwa ukurasa. 2387 01:53:25,420 --> 01:53:27,140 >> Watazamaji: Kwa hiyo kadi HTML maalum kuzuia vitambulisho script? 2388 01:53:27,140 --> 01:53:28,710 >> JOSEPH Ong: Yeah. 2389 01:53:28,710 --> 01:53:29,960 Hivyo hana kuzuia vitambulisho script. 2390 01:53:29,960 --> 01:53:32,320 Ni tu hufanya kuhakikisha kwamba tags script hawapati 2391 01:53:32,320 --> 01:53:35,120 kufasiriwa kama HTML au - 2392 01:53:35,120 --> 01:53:35,400 yeah. 2393 01:53:35,400 --> 01:53:38,470 Ni tu anakuja juu kama nini ni kweli ni. 2394 01:53:38,470 --> 01:53:39,220 Sawa. 2395 01:53:39,220 --> 01:53:40,930 Ili kwamba ilikuwa mapitio jaribio. 2396 01:53:40,930 --> 01:53:41,830 Baridi. 2397 01:53:41,830 --> 01:53:45,088 >> [Makofi]