ブラウザ / Browser

2022年度リクルート エンジニアコース新人研修の講義資料です

1. Browser 2022/04/06 @ Recruit
2. Twitter: @yosuke_furukawa Github: yosuke-furukawa
3. Browser • ஌ͬͯΔΑ͏Ͱ஌Βͳ͍ • ΢ΣϒΞϓϦέʔγϣϯΛ࡞Δ࣌ʹඞͣ࢖͏ ΋ͷͷɺத਎͕Ͳ͏ͳͬͯΔ͔Λઆ໌ͯ͘͠ ͍ͩ͞ͱݴΘΕΔͱͲ͏ͨ͠Β͍͍͔Θ͔Β ͳ͍΋ͷ • ࠓճ͸ͦΜͳϒϥ΢βʹ৮ΕΑ͏ͱࢥ͍·͢
4. Browse + er ோΊΔ΋ͷ
5. ຊߨٛͷͶΒ͍ • օ͞Μʹϒϥ΢βͷத਎Λೝࣝͯ͠΋Β͍ɺ಄ͷதʹ ϚοϓΛ࡞ͬͯ΋Β͏ɻ • ϒϥ΢βͷ஍ਤΛ࡞্ͬͨͰ͜ͷ͋ͱͷߨٛʢύ ϑΥʔϚϯεɺηΩϡϦςΟɺJavaScript/ TypeScriptʣΛड͚ͯ΋Β͏͜ͱͰཧղ౓ΛਂΊΔɻ • HTTP/HTMLͳͲͷجૅతͳ෦෼͸ޙ൒ϋϯζΦϯͰ ;ΕΔɻ
6. લ൒ Agenda • ϒϥ΢βͷػೳ • ϒϥ΢βͷ࢓૊Έ • ϨϯμϦϯάΤϯδϯ • JavaScript Τϯδϯ • ωοτϫʔΫ • σʔλετϨʔδ
7. ϒϥ΢βͷػೳ
8. ϒϥ΢βͷػೳ 🔒
   IUUQTFYBNQMFDPN
9. ϒϥ΢βͷػೳ 🔒
   IUUQTFYBNQMFDPN ໭Δ ਐΉ Ϧϩʔυɾதࢭ ΞυϨεόʔ
10. ϒϥ΢βͷػೳ • ΞυϨεόʔʹ͍Εͨ URL Λجʹϖʔδ͕ϨϯμϦϯά͞ΕΔ • ϦϯΫΛΫϦοΫ͢ΔͳͲͷΞΫγϣϯ͕͋Δͱ URL ͕มԽ ͠ɺཤྺʹͨ·Δ • ໭ΔϘλϯΛԡ͢ͱཤྺΛ໭ΕΔ • ਐΉϘλϯΛԡ͢ͱཤྺΛਐΊΒΕΔ • ϦϩʔυϘλϯΛԡ͢ͱ࠶౓ URL Λߋ৽͢Δ *NBHF
11. ϒϥ΢βͷػೳ • ϒϥ΢βͷجຊػೳΛյ͢Α͏ͳΞϓϦέʔγϣϯ͸ମݧ͕ѱ ͍ɻ • ໭ͬͨ࣌ʹ΋ͱ΋ͱ͍ͨεΫϩʔϧҐஔ͡Όͳ͍৔ॴʹ໭͞Ε ͨΒɾɾɾɾʁ • εΫϩʔϧ͢ΔࡍʹΨλΨλͯ͠εϜʔεͳૢ࡞͕ग़དྷͳ͔ͬ ͨΒɾɾʁ • Enter ΩʔͰૹ৴Ͱ͖ͳ͍ϑΥʔϜΛ࡞ͬͯ͠·ͬͨ Βɾɾɾʁ
12. ϒϥ΢βͷػೳ • ϒϥ΢βͷجຊػೳΛյ͢Α͏ͳΞϓϦέʔγϣϯ͸ମݧ͕ѱ ͍ɻ • ໭ͬͨ࣌ʹ΋ͱ΋ͱ͍ͨεΫϩʔϧҐஔ͡Όͳ͍৔ॴʹ໭͞Ε ͨΒɾɾɾɾʁ • εΫϩʔϧ͢ΔࡍʹΨλΨλͯ͠εϜʔεͳૢ࡞͕ग़དྷͳ͔ͬ ͨΒɾɾʁ • Enter ΩʔͰૹ৴Ͱ͖ͳ͍ϑΥʔϜΛ࡞ͬͯ͠·ͬͨ Βɾɾɾʁ શ෦ѱ͍ϢʔβʔΤΫεϖϦΤϯε
13. ϒϥ΢βͷػೳ • େݪଇ: ΢ΣϒΞϓϦέʔγϣϯ͸ϒϥ΢βͷػೳΛ յͯ͠͸͍͚ͳ͍ɻ • յ͢ͱମݧ͕ѱ͍͚ͩ͡Όͳ͍ɻ • ΞΫηγϏϦςΟ΋ѱ͘ͳΔɻ • ηΩϡϦςΟͱ͔ͷอޢػߏ΋ಇ͔ͳ͘ͳΔ͔΋ɻ
14. ϒϥ΢βͷػೳ • େݪଇ: ΢ΣϒΞϓϦέʔγϣϯ͸ϒϥ΢βͷػೳΛ յͯ͠͸͍͚ͳ͍ɻ • յ͢ͱମݧ͕ѱ͍͚ͩ͡Όͳ͍ɻ • ΞΫηγϏϦςΟ΋ѱ͘ͳΔɻ • ηΩϡϦςΟͱ͔ͷอޢػߏ΋ಇ͔ͳ͘ͳΔ͔΋ɻ ͲΜͳʹྑ͍ΞϓϦͰ͋ͬͯ΋
    ϒϥ΢βͷػೳΛյ͢Α͏ͳΞϓϦ͸࢖ΘΕͳ͘ͳΔ
15. ϒϥ΢βͷ࢓૊Έ
16. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF
17. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF ϒϥ΢βͷΠϯλϑΣʔε
    ΞυϨεόʔͱ͔໭ΔϘλϯͱ͔
18. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF ϒϥ΢βͷ֩
    ޙͰ঺հ͢Δ༷ʑͳߏ੒ཁૉͱௐఀ͢Δ
19. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF ίϯςϯπͷඳըΛߦ͏ɻίϯςϯπ͕ )5.-ͳΒϖʔδΛύʔεͯ͠ϩʔυ͢Δ
20. ϒϥ΢βͷߏ଄ • ϨϯμϦϯάΤϯδϯ • HTML΍CSS͸ͦͷ··Ͱ͸ਓ͕ؒಡΊΔ΋ͷ ʹͳΒͳ͍ɻ • σʔλΛܭࢉ͠ɺਓ͕ؒݟ͑Δܗʹදݱ͢Δ ͜ͱΛϨϯμϦϯάͱݺͿ
21. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF ωοτϫʔΫ૚ɺ)551ϦΫΤετͨ͠ Γɺ)5514ͰϦΫΤετͨ͠Γ
22. ϒϥ΢βͷߏ଄ • ωοτϫʔΫ • HTML ΍ CSS ΍ JavaScript ͱ͍ͬͨίϯςϯπΛμ΢ϯϩʔυͨ͠ΓɺΞο ϓϩʔυ͢Δ࢓૊Έ • ϒϥ΢βͷσʔλަ׵ͷ࢓૊Έ͸ʮσʔλͷཁٻʢϦΫΤετʣʯͱʮཁٻ ʹରͯ͠ͷԠ౴ʢϨεϙϯεʣʯͱ͍͏̎ͭͷγϯϓϧͳ΍ΓऔΓʹΑͬͯ ߦΘΕ͍ͯΔ •
23. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF +BWB4DSJQU
    ࣮ߦΤϯδϯ
    W
    ͱ͔
    4QJEFS.POLFZ
    ͱ͔
    +4$
    ͱ͔
24. ϒϥ΢βͷߏ଄ • JavaScript Τϯδϯ • JavaScript ͸ίϯςϯπΛಈతʹมߋ͢Δͱ͍ͬͨඇৗʹॏཁͳॲཧΛߦ ͏෦෼ • ʮJust In Time ίϯύΠϥʯͱݺ͹ΕΔಈతʹίʔυΛղੳ͢ΔࣄͰੑೳ Λิ͍ͬͯΔ •
25. ϒϥ΢βͷߏ଄ 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL +BWB4DSJQU
    &OHJOF %BUB
    4UPSBHF σΟεΫʹอଘ͢ΔϨΠϠ
    $PPLJF
    ͱ͔
    MPDBMTUPSBHF
    ͱ͔͕֘౰
26. ϒϥ΢βͷߏ଄ • σʔλετϨʔδ • σʔλΛӬଓతʹอଘ͢Δ෦෼ • ࣮͸ history ΋ cookie ΋ localstorage ΋શ෦ σʔλετϨʔδ෦෼ʹอଘ͞Ε͍ͯΔ
27. ϒϥ΢βͷߏ଄ • ͜ͷϚοϓΛུ֓ͱͯ͠಄ʹೖΕ͓͍ͯͯ΄͍͠ɻ • HTML/CSSΛ࣮ߦͯ͠Δ৔ॴ͕Ͳ͔͜ • JavaScript ͸Engine͕෼͔ΕͯΔͱ͔ • ωοτϫʔΫ෦෼ͰσʔλΛ͖͍࣋ͬͯͯΔͱ͔ • Cookie ͷσʔλΛอଘͯ͠Δͷ͸σʔλετϨʔδͱ͔
28. ϒϥ΢βͷྺ࢙
29. ϒϥ΢βͷྺ࢙ • ͍͖ͳΓ͜͏͍͏ߏ੒ཁૉʹͳͬͨΘ͚Ͱ͸ ͳ͍ɻ • ͜ͷߏ੒ཁૉʹͳΔ·Ͱʹḷͬͨྺ࢙ΛৼΓ ฦΔ͜ͱͰҰ୴ཧղΛਂΊΔ • ͱ͸͍͑ͨͩͷྺ࢙ͳͷͰɺ໾ʹཱͭ஌ࣝͱ ͍͏ΑΓ͸ʮ΁ʔʯͬͯฉ͍ͯͯ͘Εͯྑ͍
30. ࠷ॳظͷϒϥ΢β • WorldWideWebϒϥ΢β • Ұ൪࠷ॳͷϒϨΠΫεϧʔ͸ϋΠύʔςΩετͱΠϯ λʔωοτΛ૊Έ߹Θͤͨ͜ͱʹΑͬͯੜ·ΕΔɻ • ૊Έ߹Θͤͨਓ͸༗໊ͳςΟϜɾόʔφʔζɾϦʔ •
31. ࠷ॳظͷϒϥ΢β • WorldWideWeb • URLදࣔ΋ͳ͍ɺ໭ΔɾਐΉͱ͔ͷϘλϯ΋ ͳ͍
32. ࠷ॳظͷϒϥ΢β • WorldWideWeb 6TFS
    *OUFSGBDF #SPXTFS
    &OHJOF 3FOEFSJOH
    &OHJOF /FUXPSL %BUB
    4UPSBHF )5.- )551 )JTUPSZ
33. 1990೥୅: ϒϥ΢βઓ૪ • ͦͷதͰҰ൪ਓؾʹͳͬͨͷ͕ʮMosaicʯͱ͍͏ϒϥ΢β • ςΩετͱҰॹʹΠϯϥΠϯͰը૾Λදࣔ͢Δͱ͍͏ϒϨ ΠΫεϧʔΛىͨ͜͠ɻ •
34. 1990೥୅: ϒϥ΢βઓ૪ • จॻͷ಺༰ͱ૷০Λ෼͚ͯఆٛͰ͖ΔΑ͏ʹ͠Α͏ͱ͍͏ ํ਑ʹͳ͍ͬͯ͘ɻ • ࠷ॳظͷϒϥ΢β͸಺༰ͱ૷০͸ผΕͯͳ͔ͬͨɻ • CSS ͕஀ੜ͠ɺ࢓༷͕ਐΜͰ͍͘Α͏ʹͳΔɻ • ͜ͷࠒ͔Β HTML / CSS ͷଘࡏ͕Ͱ͖Δɻ
35. 1990೥୅: ϒϥ΢βઓ૪ • ϏοάΧϯύχʔ΋໧͍ͬͯͳ͍ɻ • IBM͕ WebExplorer Λ։ൃ͠ɺͦͷޙ Microsoft ͕ Internet Explorer Λ։ൃ͢Δɻ • Mosaic ͸ NetScape ձࣾΛ্ཱͪ͛ɺ Navigator ͱ͍͏໊ લͰ։ൃ͢Δɻ • ୈҰ࣍ϒϥ΢βઓ૪͕ຄൃ͢Δɻ
36. 1990೥୅: ϒϥ΢βઓ૪ • JavaScript ΋͜ͷࠒ͔Β։ൃ͞Εͩ͢ʢ1995೥ʣ • HTTP Cookie ͳͲͷ࢓૊Έ΋։ൃ͞ΕΔ • HTTPS ͳͲͷ҉߸Խͷ࢓૊Έ΋͜ͷࠒ͔Β •
37. 1990೥୅: ϒϥ΢βઓ૪ • 1990೥୅ޙ൒ʹ͸େମͷύʔπ͕ἧͬͯ͘Δ
38. 1990೥୅: ϒϥ΢βઓ૪ • ػೳͷ֦ॆ͕ਐΜͰ͍͘ҰํͰϒϥ΢βઓ૪͸൵ܶ΋΋ͨΒͨ͠ɻ • աܹͳࠩผԽͱػೳ֦ॆ͕ਐΉதͰಠ֦ࣗுʹ͸͠Δ͜ͱ΋૿͑ͯ ͍͘ • JScript ͱݺ͹ΕΔ΄ͱΜͲ JavaScript ͱಉ͡Α͏ͳػೳΛ࣋ͬͨ εΫϦϓτݴޠ͕ Internet Explorer ʹ࣮૷͞ΕΔ • JavaScript Ͱ Style ΛܾΊΒΕΔ JavaScript Style Sheet ΋ఏҊ͞ ΕΔ͕ɺ࢓༷ܾΊ͖Εͳ͍͏ͪʹऴΘΔͳͲɻ
39. 1990೥୅: ϒϥ΢βઓ૪ • ࠷ऴతʹୈҰ࣍ϒϥ΢βઓ૪͸ϚΠΫϩιϑτ͕উར͢Δ • OSʹϒϥ΢β͕ಉࠝ͞ΕΔࣄͰ NetScape ͷϒϥ΢βΑΓ ΋Ϣʔβʔ਺Λ৳͹͠ɺՉ઎ঢ়ଶ͕࡞ΒΕͯ͠·͏ɻ • NetScape ଆ͸Ϣʔβʔ਺ͷ֫ಘʹ͸ࣦഊͨ͠΋ͷͷɺ OSS Խͯ͠ϒϥ΢βͷٕज़Λޙੈʹ࢒͠ɺ Mozilla ͱ͍͏ اۀʹܗΛม͑ͯଘଓ͢Δ
40. 2000೥୅: Google Chrome ͷ ొ৔ɺεϚʔτϑΥϯͷొ৔ • Mozilla ͕ຬΛ࣋ͯ͠ FireFox Λ։ൃͯ͠ɺϦϦʔε͢Δɻ • ࠓ·Ͱ Internet Explorer Ұڧঢ়ଶ͕ͩͬͨɺ࢓༷ʹ஧࣮Ͱ͋Γɺߴ଎ʹಈ͖ɺ λϒػೳ΍֦ுػೳΛඋ͑ͨ FireFox ͕Ϣʔβʔ਺Λൈ͘ • 2000೥୅ޙ൒ʹͳΔͱϓϨΠϠʔ͕มΘΔɻ • ·ͣ Google ͕ JavaScript ͱಈతͳ HTTP ϦΫΤετʢ͍ΘΏΔ Ajaxʣ Λ૊Έ ߹ΘͤΔࣄͰ͜Ε·ͰͷHTMLɺ CSSɺ JavaScript ͱ͍͏ٕज़͚ͩͰΠϯλϥΫ ςΟϒͳΞϓϦέʔγϣϯΛ΢Σϒ্Ͱ࡞ΕΔ͜ͱΛ࣮ફ͢Δɻ • ࣍ʹ Google ͕ Chrome ΛϦϦʔε͢Δɻ
41. 2000೥୅: Google Chrome ͷ ొ৔ɺεϚʔτϑΥϯͷొ৔ • 2000೥୅ͷલ൒͔Βޙ൒ʹ͔͚ͯى͖ͨͷ͸ɺ΢Σϒ্ͰΠϯλϥ ΫςΟϒͳΞϓϦέʔγϣϯΛ࡞Δͱ͍͏ٕज़తͳύϥμΠϜγϑτ • ϒϥ΢β্Ͱ JavaScript Λத৺ʹΞϓϦέʔγϣϯΛ࡞Δػձ͕૿͑ ͨɻ • ݁Ռͱͯ͠ɺΞϓϦέʔγϣϯͷ࣮ߦ଎౓ʹ௚݁͢Δ JavaScript ͷ࣮ ߦ؀ڥʹ΋ݟ௚͕͠ೖΔɻ • ֤ϒϥ΢βͷJavaScript Engineʹ Just-in-time (JIT) Compiler ͱݺ͹ ΕΔ࣮ߦதʹ࠷దԽ͢Δػೳ͕ಋೖ͞Ε͍ͯ͘
42. 2000೥୅: Google Chrome ͷ ొ৔ɺεϚʔτϑΥϯͷొ৔ • ϒϥ΢β͕୯ͳΔ΢ΣϒϖʔδͷӾཡ͚ͩͰ͸ͳ ͘ɺΞϓϦέʔγϣϯج൫ͱͯ͠ͷํ޲ʹਐΉɻ +*5
43. 2010೥୅: HTML5ϒʔϜͱε ϚʔτϑΥϯωΠςΟϒΞϓϦ • 2010೥͔Β͸ΞϓϦέʔγϣϯΛ΢ΣϒͰΑΓޮ ཰తʹɺ৽͘͠࡞Ζ͏ͱ͢ΔϒʔϜ͕౸དྷͨ͠ɻ • ϒϥ΢βʹ΋εϚʔτϑΥϯͰݟΕΔΞϓϦέʔ γϣϯΛ࡞ΔྲྀΕ͕౸དྷͨ͠ɻ • ͜ͷ͋ͨΓ͔ΒωΠςΟϒΞϓϦͱϒϥ΢β྆ํ Ͱಉ͡Α͏ͳػೳΛఏڙ͢ΔΑ͏ʹͳΔ
44. 2010೥୅: HTML5ϒʔϜͱε ϚʔτϑΥϯωΠςΟϒΞϓϦ • ΞϓϦέʔγϣϯͷ࡞Γํ͕ωΠςΟϒΞϓϦͷ࡞Γํʹۙ͘ͳͬͯ ͍ͬͨɻ • ΫϥΠΞϯτ಺Ͱ LocalStroage ΍ Session Stroage ͱ͍ͬͨΫϥΠΞ ϯτͷετϨʔδΛ࢖͓͏ͱͨ͠ΓɺΦϑϥΠϯͰ΋ಈ࡞͢ΔΑ͏ʹ ϒϥ΢β͕ਐԽ͍ͯͬͨ͠ɻ • ͜ͷࠒʹ Network ʹ΋ਐԽ͕๚ΕΔɻϒϥ΢β͕ར༻͢Δίϯςϯπ ͕ΑΓϦονʹͳΓɺΞϓϦέʔγϣϯ΋Ͱ͖Δ͜ͱ͕૿͍͑ͯ͘ͱɺ ωοτϫʔΫͷར༻཰্͕͕͍ͬͯ͘ • HTTP/2 ͱ͍ͬͨޮ཰తʹϦΫΤετ͢Δํ๏͕ग़ͯ͘Δɻ
45. 2010೥୅: HTML5ϒʔϜͱε ϚʔτϑΥϯωΠςΟϒΞϓϦ • ΑΓޮ཰తʹ࣮ߦͰ͖ΔΑ͏ʹɺΞϓϦέʔγϣϯ ΑΓͷػೳ͕૿͍͑ͯ͘ +*5 )551 MPDBMTUPSBHF
46. ϒϥ΢βྺ࢙·ͱΊ • ͜ͷΑ͏ʹΞϓϦέʔγϣϯΛ࡞Δํ๏͕֬ ཱ͞Ε͍ͯͬͨΓɺ৽͍ٕ͠ज़తͳస׵͕ى ͖Δͱͦͷ౎౓ϒϥ΢β͸ٕज़తͳਐԽΛ਱ ͖͛ͯͨɻ • ࠓ೔ͷϞμϯͳϒϥ΢β͸͜ͷΑ͏ͳٕज़త ਐԽ͕೔ਐ݄าͰߦΘΕ͍ͯΔɻ
47. ϒϥ΢βΛյͯ͠͸͍͚ͳ͍
48. HistoryΛյͯ͠͸͍͚ͳ͍ • ϒϥ΢βͷػೳʹ͸ʮ໭ΔʯͱʮਐΉʯͱ͍ͬͨӾཡཤྺΛલʹ ໭͠ɺਐΊΔػೳ͕͋Δɻ • Ӿཡཤྺ͸ཤྺͰ͋Γɺ໭ΔΛԡͨ͠ͱ͖ʹ͸جຊతʹલͷঢ়ଶ ʹ໭Δ͜ͱ͕๬·͍͠ɻ • ͔͠͠ͳ͕Βɺ͍͔ͭ͘ͷ΢ΣϒΞϓϦέʔγϣϯͰ͸ɺʮ໭ ΔʯΛԡͨ࣌͠ʹ໭Εͳ͍ΞϓϦέʔγϣϯ͕ଘࡏ͢Δɻ • ΋͘͠͸໭Ζ͏ͱͨ࣌͠ʹҰ෦ͷঢ়ଶ͚ͩ໭͢͜ͱ͕Ͱ͖Δ͕ɺ ׬શʹલͷঢ়ଶΛ࠶ݱͰ͖ͳ͍ΞϓϦέʔγϣϯ΋ଘࡏ͢Δɻ
49. HistoryΛյͯ͠͸͍͚ͳ͍ • ௚લʹߦͬͨίϝϯτ͕ফ͑ͯΔྫ
50. HistoryΛյͯ͠͸͍͚ͳ͍ • ໭ΔϘλϯ͕ແޮʹͳ͍ͬͯΔྫ
51. εΫϩʔϧΛյͯ͠͸͍͚ͳ͍ • ը໘ΛεΫϩʔϧ͢Δ͜ͱʹΑͬͯΨλΨλͱ ࢥͬͨҐஔʹεΫϩʔϧͰ͖ͳ͍ࣄ͕͋Δɻ • ͜ͷεΫϩʔϧͷΨλπΩͷ͜ͱΛʮεΫϩʔ ϧδϟϯΫʯͱݺͿɻ •
52. εΫϩʔϧΛյͯ͠͸͍͚ͳ͍ • εΫϩʔϧҐஔ͕໭Βͳ͍ྫ
53. ϑΥʔϜΛյͯ͠͸͍͚ͳ͍ • λϒͰભҠͰ͖ͳ͍ • ΤϯλʔΩʔͰૹ৴Ͱ͖ͳ͍
54. ϨϯμϦϯάΤϯδϯ
55. ϨϯμϦϯάΤϯδϯ • ίϯςϯπʢHTMLͳͲ) Λड͚औͬͯ಺༰Λ ඳը͢Δ HTML ϖʔδ ϨϯμϦϯά
56. ϨϯμϦϯάΤϯδϯ • ίϯςϯπʢHTMLͳͲ) Λड͚औͬͯ಺༰Λ ඳը͢Δ HTML ϖʔδ ϨϯμϦϯά ͜͜ʹࢸΔ·ͰʹυϥϚ͕ͨ͘͞Μ͋Δɻ
57. ϨϯμϦϯάΤϯδϯ • ࢦఆ͞ΕͨίϯςϯπΛඳը͢Δ΋ͷ • ͜͜Ͱ͸ओʹ HTML Λඳը͢Δ࣌ͷྲྀΕͰղ આ͢Δ͕ɺຊདྷ͸ HTML ʹґΒͣɺίϯςϯ πΛඳը͢Δɻ (SBQIJD
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58. ϨϯμϦϯάΤϯδϯ • ࢦఆ͞ΕͨίϯςϯπΛඳը͢Δ΋ͷ • ͜͜Ͱ͸ओʹ HTML Λඳը͢Δ࣌ͷྲྀΕͰղ આ͢Δ͕ɺຊདྷ͸ HTML ʹґΒͣɺίϯςϯ πΛඳը͢Δɻ (SBQIJD
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59. ϨϯμϦϯάϓϩηε • HTML ͷϨϯμϦϯά͸ "ಈతʹ" ϨϯμϦϯ ά͢Δɻ • JavaScript ΍ϢʔβʔೖྗɺΞχϝʔγϣϯ ͳͲͰϨϯμϦϯά͕ߋ৽͞ΕΔɻ *OJUJBM
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60. ϨϯμϦϯάϓϩηε • ίϯςϯπ͕ಈతʹߋ৽͞ΕΔͱ͍͏͜ͱ͕ ΢Σϒͷಛ௃ • ͦͷͨΊʹ͍͔ͭ͘ͷதؒදݱΛ͍࣋ͬͯΔ IUNM
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63. Style • DOM Λ࡞ͬͨΒͦΕʹ Style Λ ౰͍ͯͯ͘ • %PDVNFOU )5.- #PEZ %JW 1 5&95 1 5&95 p { color: red } IFMMP
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64. Style • ΍Δ͜ͱ͸େ͖͘෼͚ͯ̎ͭ • ηϨΫλϚονϯά • ΧεέʔσΟϯά
65. Style • ηϨΫλ • ελΠϧΛ౰ͯΔࡍͷ௚઀తͳϧʔϧΛهड़ ͯ͠಺༰ΛؚΊͨ΋ͷ p { color: red; } #test { border: red 2px solid; } .foo { background-color: skyblue; }
66. Style • CSS (Cascading Style Sheets) • ηϨΫλΛෳࡶʹࢦఆͰ͖Δ ͪͳΈʹෳࡶͳࢦఆΛ͢Ε͹͢Δ΄Ͳෳࡶͳܭࢉ͕ඞཁͳͷͰ஗͍ɻ • ηϨΫλ͸ඃΔ͜ͱ͕͋Δ • ඃͬͨΒৄࡉ౓Ͱܾ·Δ EJWOPU GPP
    
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68. Style • CSS ৄࡉ౓ (ڧ͍ॱͷྫ) • styleଐੑͰͷࢦఆ • ηϨΫλͷ ID ͷ਺ • ηϨΫλͷଐੑͷ਺ • ηϨΫλͷཁૉ໊ͷ਺
    
    
    
    
    
    
    
    
    
    
    
    
    
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69. Style • ΧεέʔσΟϯά • ΞϯέʔτೖྗϑΥʔϜͷதͰۭཝΛݟ͚ͭͯิ͏ॲཧ • ਌ͷཁૉ͕͍࣋ͬͯͨΒࢠʹద༻͍ͯ͘͠ • .BSHJO 'POU $PMPS 1BEEJOH ✔ ✔ 255,255,255,0 top: 20px left: ✔family: serif bottom: style: size: top: left: bottom: ຒ·ͬͯͳ͍ͱ͜ΖΛνΣοΫ .BSHJO 'POU $PMPS 1BEEJOH ✔ ✔ 255,255,255,0 top: 20px left: 20px ✔family: serif bottom: 30px style: normal size: 10 top: 20px left: 20px bottom: 20px ✔ ✔ ✔ ✔ ✔ ✔ ✔ ਌͔Β΋Β͑Δͱ͜Ζ͸आΓͯ͘Δ
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74. Layout • ҰͭҰͭͷཁૉ͸ελΠϧΛ΋͍ͬͯͯ΋ɺͦ Ε͕Ͳ͜ʹ഑ஔ͞ΕΔ͔ɺͲΕ͘Β͍ͷαΠζ ͳͷ͔ɺͱ͍͏৔ॴͷ৘ใ͸͍࣋ͬͯͳ͍ɻ • HTMLͷߏ଄ͱ Style ͷ৘ใΛجʹ৔ॴͱαΠζ Λܭࢉ͢Δॲཧ͕ Layout • ਌͔Β࠶ؼతʹḷͬͯ Layout ॲཧΛߦ͏
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76. Paint • ඳը͢ΔҐஔͱαΠζ͕ܾ·ͬͨޙɺͲͷॱ ൪Ͱඳը͢Δ͔ΛܾΊΔॲཧ • DOMͷॱংͰ͸ͳ͘ɺޙΖ͔ΒલʹͪΌΜͱ ඳը͠ͳ͍ͱࢥͬͨͱ͓ΓʹϨϯμϦϯά͞ Εͳ͍ɻ CBDLHSPVOE qPBUJOH GPSFHSPVOE PVUMJOF
77. Paint • DOMͷཁૉͷॱ൪Ͱ͸ͳ͘ɺ z-index ౳Λ ࢖ͬͯޙΖͷཁૉͱલͷཁૉΛೖΕସ͑Δ͜ ͱ͕Ͱ͖Δɻ <div class="yellow"></div> <div class="green"></div> <style> .yellow { z-index: 2; ... } .green { z-index: 1; ... } </style>
78. Composite & Render • Ͱ͖͕͋ͬͨ΋ͷΛඞཁͳ෦෼͚ͩඳը͢ΔΑ͏ʹ Ωϟϓνϟʔͯ͠άϥϑΟοΫϥΠϒϥϦʹ౉͢ • Πϝʔδͱͯ͠͸શ෦ܭࢉ͠ऴΘͬͯϨΠΞ΢τ΋ऴ ΘͬͯલܠͱഎܠऴΘͬͨͷͰɺͦΕΛҰຕͷϓϦϯ τ͢ΔࣸਅʹऔΔΈ͍ͨͳΠϝʔδ • (SBQIJD
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82. JavaScript Τϯδϯ
83. JavaScript Τϯδϯ • JavaScript Λ࣮ߦ͢ΔΤϯδϯ • ࠷ۙͷΤϯδϯ͸େମ Just In Time ίϯύΠϥ͕͍ͭ ͓ͯΓɺ୯ͳΔΠϯλϓϦλͰ͸ͳ͘ɺ౷ܭతʹঢ়گ Λݟͯߴ଎Խ͞ΕΔ • ͜͜Ͱ͸ུ֓Λղઆ͠ɺΤϯδϯͷؾ࣋ͪΛ஌Δɻ • ͪͳΈʹ৘ใ͕ଟ͍ v8 ͷΤϯδϯΛࢀߟʹ͍ͯ͠Δɻ
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    BB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    3FUVSO
    
    4
    YDBBFDE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDE
    !
    
    
    
    
    
    GC
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    4
    YDBBFDE
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    &
    YDBBFDEB
    !
    
    
    
    
    C
    
    C
    
    
    
    
    
    
    
    
    
    5FTU-FTT5IBO0S&RVBM
    B
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDEE
    !
    
    
    
    
    B
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ*G'BMTF
    <>
    YDBBFDF
    !
    
    
    4
    YDBBFDEG
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    
    
    
    
    
    
    
    
    YDBBFDF
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    B
    
    
    
    
    
    
    
    
    
    YDBBFDF
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ
    <>
    YDBBFDG
    !
    
    
    4
    YDBBFDF
    !
    
    
    
    
    
    GC
    
    
    
    
    
    
    
    
    
    
    
    
    -EBS
    S
    
    &
    YDBBFDF
    !
    
    
    
    
    D
    
    D
    
    
    
    
    
    
    
    
    
    5FTU(SFBUFS5IBO0S&RVBM
    B
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDF
    !
    
    
    
    
    B
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ*G'BMTF
    <>
    YDBBFDFF
    !
    
    "45
    ͔Β
    CZUFDPEF
    ʹ্ͨ͠Ͱ࣮ߦ͢Δɻ 
    3FTVMU
    
87. Just In Time ίϯύΠϥ *OUFSQSFUFS +*5
    $PNQJMFS 
    &
    YDBBFDBF
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    $SFBUF6ONBQQFE"SHVNFOUT
    
    
    
    
    
    
    
    
    
    YDBBFDBG
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    4
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    S
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    &
    YDBBFDC
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    5FTU&RVBM4USJDU
    S
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDCC
    !
    
    
    
    
    B
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ*G'BMTF
    <>
    YDBBFDE
    !
    
    
    4
    YDBBFDCE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDD
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDDB
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDDD
    !
    
    
    
    
    B
    G
    
    G
    G
    
    $BMM1SPQFSUZ
    S
    UIJT
    S
    S
    <>
    
    4
    YDBBFDE
    !
    
    
    
    
    BB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    3FUVSO
    
    4
    YDBBFDE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDE
    !
    
    
    
    
    
    GC
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
         bytecode Optimized machine code Optimize Deoptimize
88. Just In Time ίϯύΠϥ *OUFSQSFUFS +*5
    $PNQJMFS 
    &
    YDBBFDBF
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    $SFBUF6ONBQQFE"SHVNFOUT
    
    
    
    
    
    
    
    
    
    YDBBFDBG
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    4
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    S
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    &
    YDBBFDC
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    5FTU&RVBM4USJDU
    S
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDCC
    !
    
    
    
    
    B
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ*G'BMTF
    <>
    YDBBFDE
    !
    
    
    4
    YDBBFDCE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDD
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDDB
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDDD
    !
    
    
    
    
    B
    G
    
    G
    G
    
    $BMM1SPQFSUZ
    S
    UIJT
    S
    S
    <>
    
    4
    YDBBFDE
    !
    
    
    
    
    BB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    3FUVSO
    
    4
    YDBBFDE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDE
    !
    
    
    
    
    
    GC
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
         bytecode Optimized machine code Optimize Deoptimize *OUFSQSFUFS
    ͷ࣮ߦ࣌৘ใΛجʹ
    +*5
    $PNQJMFS
    Ͱ࠷దԽ͢Δ
89. Just In Time ίϯύΠϥ *OUFSQSFUFS +*5
    $PNQJMFS 
    &
    YDBBFDBF
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    $SFBUF6ONBQQFE"SHVNFOUT
    
    
    
    
    
    
    
    
    
    YDBBFDBG
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    4
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    S
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDC
    !
    
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    &
    YDBBFDC
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    5FTU&RVBM4USJDU
    S
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDCC
    !
    
    
    
    
    B
    
    
    
    
    
    
    
    
    
    
    
    
    
    +VNQ*G'BMTF
    <>
    YDBBFDE
    !
    
    
    4
    YDBBFDCE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    C
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB;FSP
    
    
    
    
    
    
    
    
    
    YDBBFDD
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDD
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDDB
    !
    
    
    
    
    
    G
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
    
    &
    YDBBFDDD
    !
    
    
    
    
    B
    G
    
    G
    G
    
    $BMM1SPQFSUZ
    S
    UIJT
    S
    S
    <>
    
    4
    YDBBFDE
    !
    
    
    
    
    BB
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    3FUVSO
    
    4
    YDBBFDE
    !
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -EB/BNFE1SPQFSUZ
    UIJT
    <>
    <>
    
    
    
    
    
    
    
    
    
    YDBBFDE
    !
    
    
    
    
    
    GC
    
    
    
    
    
    
    
    
    
    
    
    
    4UBS
    S
         bytecode Optimized machine code Optimize Deoptimize ΋͠΋ਪఆ஋͕֎Ε͍ͯͨΒඇ࠷దԽ͕૸Δɻ
90. Just In Time ίϯύΠϥ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ਺ࣈΛ଍ؔ͢਺
    TVN 
      Կ౓΋਺ࣈΛ଍͠߹Θ͓͚ͤͯ͹ɺ
    TVN
    ؔ਺ͷ Ҿ਺͸਺ࣈɺಛʹ
    JOUFHFS
    CJU
    Ґ͔͕Θ͔Δ
    ͦ͏͢Ε͹ɺػցޠʹ͢Δ࣌ʹ࠷దԽ͕Ͱ͖Δɻ
91. Just In Time ίϯύΠϥ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ਺ࣈΛ଍ؔ͢਺
    TVN 
      Կ౓΋਺ࣈΛ଍͠߹Θ͓͚ͤͯ͹ɺ
    TVN
    ؔ਺ͷ Ҿ਺͸਺ࣈɺಛʹ
    JOUFHFS
    CJU
    Ґ͔͕Θ͔Δ
    ͦ͏͢Ε͹ɺػցޠʹ͢Δ࣌ʹ࠷దԽ͕Ͱ͖Δɻ ͜Ε͕
    +VTU
    *O
    5JNF
    ίϯύΠϥͰݴ͏ͱ͜Ζͷ࠷దԽॲཧ
92. Just In Time ίϯύΠϥ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ਺ࣈΛ଍ؔ͢਺
    TVN 
      Կ౓΋਺ࣈΛ଍͠߹Θ͓͚ͤͯ͹ɺ
    TVN
    ؔ਺ͷ Ҿ਺͸਺ࣈɺಛʹ
    JOUFHFS
    CJU
    Ґ͔͕Θ͔Δ
    ͦ͏͢Ε͹ɺػցޠʹ͢Δ࣌ʹ࠷దԽ͕Ͱ͖Δɻ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ͍͖ͳΓ͜͜ͰจࣈྻΛ଍͢
    TVN 
      ࠷దԽ͞ΕͨॴͰจࣈྻΛҾ਺ʹ౉ͨ͠ΒͲ͏ͳ Δ͔ʁ
93. Just In Time ίϯύΠϥ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ਺ࣈΛ଍ؔ͢਺
    TVN 
      Կ౓΋਺ࣈΛ଍͠߹Θ͓͚ͤͯ͹ɺ
    TVN
    ؔ਺ͷ Ҿ਺͸਺ࣈɺಛʹ
    JOUFHFS
    CJU
    Ґ͔͕Θ͔Δ
    ͦ͏͢Ε͹ɺػցޠʹ͢Δ࣌ʹ࠷దԽ͕Ͱ͖Δɻ GVODUJPO
    TVN B
    C
    \
    
    
    SFUVSO
    B
    
    C
    ^
    
    ͍͖ͳΓ͜͜ͰจࣈྻΛ଍͢
    TVN 
      ࠷దԽ͞ΕͨॴͰจࣈྻΛҾ਺ʹ౉ͨ͠ΒͲ͏ͳ Δ͔ʁ CZUFDPEF͔Β΍Γ௚͢͜ͱʹͳΔʢඇ࠷దԽ͕૸Δʣɻ
    ͔ͤͬ͘+*5Ͱ࠷దԽͨ͠ॲཧ͕ແବʹͳΔɻ
94. JIT Λࡴ͢ཁҼҰཡ (v8) • ܕ৘ใͷෆҰக • not int32 (integer ͡Όͳ͔ͬͨ) • not a string (จࣈྻ͡Όͳ͔ͬͨ) • not an array index (഑ྻͷఴࣈ͡Ό ͳ͔ͬͨ) • etc https://github.com/v8/v8/blob/master/src/deoptimizer/deoptimize-reason.h • ༧ظͤ͵ૢ࡞ • cow array's elements changed (ίϐʔͨ͠഑ྻ͕มߋ͞Εͨ) • division by zero (θϩআࢉ) • Out of bounds (഑ྻͷൣғ௒͑) • etc
95. JIT Λࡴ͢ཁҼҰཡ (v8) • ܕ৘ใͷෆҰக • not int32 (integer ͡Όͳ͔ͬͨ) • not a string (จࣈྻ͡Όͳ͔ͬͨ) • not an array index (഑ྻͷఴࣈ͡Ό ͳ͔ͬͨ) • etc https://github.com/v8/v8/blob/master/src/deoptimizer/deoptimize-reason.h • ༧ظͤ͵ૢ࡞ • cow array's elements changed (ίϐʔͨ͠഑ྻ͕มߋ͞Εͨ) • division by zero (θϩআࢉ) • Out of bounds (഑ྻͷൣғ௒͑) • etc ֮͑Δඞཁ͸ͳ͍͕ɺॻ࣌͘ʹʮԿΛ͠ͳ͍ํ͕͍͍͔ʯΛ ஌͓͍ͬͯͨ΄͏͕ྑ͍ɻ
96. ωοτϫʔΫ
97. ωοτϫʔΫ • ௨৴Λߦ͍ɺཁٻ͞ΕͨίϯςϯπΛμ΢ϯ ϩʔυͨ͠Γɺ·ͨσʔλΛΞοϓϩʔυ͠ ͨΓ͢Δɻ • HTTP(S)௨৴Λߦ͏ϨΠϠͰɺۙ೥͸ HTTP/3 ͳͲ͕༗ޮʹͳΓͭͭ͋Δɻ
98. ͦ΋ͦ΋௨৴Λߦ͏ͱ͸ʁ • Public IP / PORT ΛΫϥΠΞϯτ͕஌͍ͬͯͯ • αʔό͕઀ଓΛ଴͍ͬͯͯ • ͦ͜ʹ઀ଓΛཁٻ͠ • ઀ଓΛཱ֬ͨ͠Βɺσʔλͷަ׵Λߦ͏ Public IP / PORT Listen Data Transfer
99. ͡Ό͋ IP ͸Ͳ͏΍ͬͯ஌Δͷʁ • IP ͸ DNSαʔό͔Βڭ͑ͯ΋Β͏ɻ • https://example.com ʹΞΫηε͠Α͏ͱͨ͠৔߹ɺҰ౓΋ΞΫηε͞Εͯͳ͔ͬͨΒ DNS Lookup (໊લ͔ΒIPΞυϨεΛҾ͘ߦҝ)͕ߦΘΕΔɻ • DNS Lookup ͸ͦͷϦΫΤετઌͷυϝΠϯʹԠͯ͡౎౓ൃੜ͢ΔͷͰɺ 3rd party domain ͕ϖʔδ಺ʹ͋Δ৔߹͸ʢҰ౓΋๚໰͞Εͯͳ͔ͬͨΒʣͦͷ࣌఺Ͱൃੜ͢ Δɻ 
    EJH
    FYBNQMFDPN
    
    015
    14&6%04&$5*0/
    
    &%/4
    WFSTJPO
    
    qBHT
    VEQ
    
    
    26&45*0/
    4&$5*0/
    FYBNQMFDPN
    
    
    */
    "
    
    "/48&3
    4&$5*0/
    FYBNQMFDPN
    
    
    */
    "
    
100. PORT ͸ʁ • ༗໊ͳϓϩτίϧͷ৔߹༧Ίܾ·ͬͯΔɻ • http ͳΒ 80 ൪ɺ https ͳΒ 443 ൪ͱ͍ͬͨ෩ʹɻ • ͜ͷ༧ΊܾΊΒΕͨ PORT ͷ͜ͱΛ well-known PORT ͱݺͿɻ • well-known ͳ PORT ͸ಛݖ͕ඞཁͳέʔε΋ଟ͍ͷͰɺ։ൃ؀ ڥ౳Ͱ͸ 3000 ൪ͱ͔ʹͯ͠ɺ localhost:3000 Ͱݺͼग़͢͜ͱ ΋ଟ͍ɻ
101. ઀ଓΛཱ֬ͱ͍͏ͷ͸ʁ • (؆ུԽͷͨΊ) TCP Λϕʔεʹ࿩͢ͱɺ֘౰ͷαʔόʹ͍͖ͳ Γ઀ଓ͢ΔͷͰ͸ͳ͘ɺ3ճͷ઀ଓ֬ೝΛܦͯ઀ଓ͢Δɻ • ͜ͷ઀ଓ֬ೝͷ͜ͱΛ 3 way handshake ͱݺͿɻ ͭͳ͛ΔΑʔ (SYN) ͍͍Αʔ ͬͪ͜΋ͭͳ͛ΔΑʔ(SYN-ACK) ͡Ό͋ͭͳ͙Ͷʔ (ACK)
102. ͡Ό͋ࢲͷ伴ͱ߹Θͤͯ͜ΕͰ࿩͠·͠ΐ͏ɻ (Client Certificate) ઀ଓΛཱ֬ͱ͍͏ͷ͸ʁ • HTTP ͳΒ͜ΕͰܨ͕Δ͕ɺ࠷ۙͷେମͷWebαʔό͸ HTTPS ͳͷͰɺ͜Ε͚ͩͰ͸ܨ͕Βͳ͍ɻ҉߸ԽͷͨΊͷ΍ΓऔΓ͕ߋ ʹߦΘΕΔɻ(※؆ུԽ͍ͯ͠ΔͨΊɺਖ਼֬Ͱ͸ͳ͍) ΑΖ͓͘͠ئ͍͍ͨ͠·͢ɻ(Client Hello) ͪ͜Βͦ͜ΑΖ͓͘͠Ͷ͕͍͠·͢ɻ (Server Hello) Θͨ͠͸͜͏͍͏΋ͷͰ͢ɻ (Server Certificate) ͜͏͍͏伴Ͱ࿩ͤ·͢ (Server Key Exchange) Θͨ͠͸͜͏͍͏΋ͷͰ͢ɻ(Client Certificate)
103. ͡Ό͋ࢲͷ伴ͱ߹Θͤͯ͜ΕͰ࿩͠·͠ΐ͏ɻ (Client Certificate) ઀ଓΛཱ֬ͱ͍͏ͷ͸ʁ • HTTP ͳΒ͜ΕͰܨ͕Δ͕ɺ࠷ۙͷେମͷWebαʔό͸ HTTPS ͳͷͰɺ͜Ε͚ͩͰ͸ܨ͕Βͳ͍ɻ҉߸ԽͷͨΊͷ΍ΓऔΓ͕ߋ ʹߦΘΕΔɻ(※؆ུԽ͍ͯ͠ΔͨΊɺਖ਼֬Ͱ͸ͳ͍) ΑΖ͓͘͠ئ͍͍ͨ͠·͢ɻ(Client Hello) ͪ͜Βͦ͜ΑΖ͓͘͠Ͷ͕͍͠·͢ɻ (Server Hello) Θͨ͠͸͜͏͍͏΋ͷͰ͢ɻ (Server Certificate) ͜͏͍͏伴Ͱ࿩ͤ·͢ (Server Key Exchange) Θͨ͠͸͜͏͍͏΋ͷͰ͢ɻ(Client Certificate) )5514
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104. ؓ࿩ٳ୊ TLS/1.3 • TLS 1.3 Ͱ͸࠷ॳͷ઀ଓ࣌ʹϥ΢ϯυτϦοϓΛݮΒ͢ࢼΈΛ͍ͯ͠Δɻ • 0-RTT ͱݺ͹ΕΔ࢓૊ΈͰ͸͍͖ͳΓ Client ͕ Hello Λඈ͹ͯ͠σʔλΛ ૹΔ͜ͱ΋Մೳʹɻ Making the web faster with HTTP/3 by kazuho https://vimeo.com/485450984
105. σʔλͷ΍ΓऔΓ • ઀ଓཱ͕֬͞Εͨޙ͸ HTTP ϓϩτίϧʹΑΔσʔλͷ΍ΓऔΓΛߦ͏ɻ • HTTP ͸جຊతʹϦΫΤετ / ϨεϙϯεͰͷ΍ΓऔΓ͕ߦΘΕΔɻ • HTTP ϦΫΤετʹ͸ϦΫΤετߦͱϔομʔͱݺ͹ΕΔϝλ৘ใͱϘσΟ ͱݺ͹ΕΔίϯςϯτ৘ใؚ͕·ΕΔɻ(※ ؆ུԽͷͨΊHTTP/1.1ͷղઆ) • 1045
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106. σʔλͷ΍ΓऔΓ • ϦΫΤετΛड͚औͬͨΒαʔό͸ϨεϙϯεʢԠ౴ʣΛฦ͢ • HTTP Ϩεϙϯεʹ͸εςʔλεΛද͢৘ใͱϨεϙϯεϔομ ʢϝλσʔλʣɺϨεϙϯεϘσΟʢ಺༰ʣؚ͕·ΕΔ )551
     
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107. σʔλͷ΍ΓऔΓ • 200ܥ: ੒ޭɺσʔλͷຊମ͕͋Ε͹ૹΔ • 300ܥ: ϦμΠϨΫγϣϯϝοηʔδ • 400ܥ: ΫϥΠΞϯτΤϥʔ • 500ܥ: αʔόΤϥʔ
108. 4FSWFS GET /main.css GET /main.js GET /image0.png σʔλͷ΍ΓऔΓ GET /index.html 200 OK 200 OK 404 Not Found 304 Not Modified
109. 4FSWFS GET /main.css GET /main.js GET /image0.png σʔλͷ΍ΓऔΓ GET /index.html 200 OK 200 OK 404 Not Found 304 Not Modified )551্Ͱσʔλͷ΍ΓऔΓ͕ߦΘΕɺͦΕ͕ϨϯμϦϯάϓ ϩηε΍+4Τϯδϯ͕࣮ߦ͞ΕΔϑΣʔζΛܦͯϖʔδ͕ग़Δ
110. 4FSWFS ͪͳΈʹ
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111. 4FSWFS ҰݸͰ΋஗͍ͱղܾ͞ΕΔ·Ͱ͔ͭ͠࢖͑ͳ͍ σʔλͷ΍ΓऔΓ
112. 4FSWFS )551
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113. 4FSWFS )551
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114. σʔλͷ΍ΓऔΓ: HTTP/3 • HTTP/2 Ͱ઀ଓίετͷ௿ݮ͕Ͱ͖͕ͨ໰୊΋͋Δɻ • ωοτϫʔΫ઀ଓ͕ෆ҆ఆͳ৔߹ TCP ઀ଓʹΑΓɺ͢΂ͯͷίωΫ γϣϯ͕ղܾ·Ͱʹ଴ͨ͞ΕΔέʔε͕༗Δɻཁ͸ύέϩεʹऑ͍ɻ • 4FSWFS 5$1ͷϨΠϠͰෆ੔߹͕͋Δͱෆ੔߹͕గਖ਼͞Ε Δ·Ͱશମ͕ϒϩοΫ͞ΕΔɻ
115. TCP͓͞Β͍ • TCP ͸৴པੑ͕ߴ͍ϓϩτίϧ • ύέϩε࣌ͷ࠶ૹ੍ޚ΍ॱং౸ୡ੍ޚͳͲɺసૹ࣌ͷ໰୊Λղ ܾͯ͘͠ΕΔɻ 4FSWFS 
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116. HTTP/3 • UDP ্ʹϓϩτίϧΛ࡞͍ͬͯΔ • TCPͷޡΓగਖ਼ͳͲͷ࢓૊ΈΛࣗ෼ͨͪͷϨΠϠ্Ͱ࠶࣮૷ 4FSWFS 
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118. σʔλετϨʔδ
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127. ޙ൒ Agenda • ϋϯζΦϯ • ϩάΠϯϑΥʔϜΛ࡞ͬͯΈΑ͏ • ·ͱΊ
128. ϋϯζΦϯ
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130. αʔόΛ࡞Δ • Ұ୴͔͜͜ΒϋϯζΦϯΛ։࢝͠·͢ɻ • Node.js ͕ඞཁͳͷͰೖΕ͓͍͍ͯͯͩ͘͞ɻ • HTML Λ഑৴Ͱ͖ΔΑ͏ʹͳΔ·Ͱ͸࡞͓ͬͯ ͍ͨͷͰɺ clone ࣮ͯ͠ߦ͍ͯͩ͘͠͞ɻ • 
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132. ωοτϫʔΫͷ΍ΓऔΓ • ͔ͤͬ͘ͳͷͰ https ʹͯ͠Έ·͠ΐ͏ɻ • લॲཧͱͯ͠CAͱূ໌ॻΛ࡞Γɺແཧ໼ཧ trust ͓͖ͤͯ͞·͢ɻ 
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135. ωοτϫʔΫͷ΍ΓऔΓ • ࣍ʹ http2 ʹͯ͠Έ·͠ΐ͏ɻ • http2 ͷ createSecureServer Λ࢖ͬͯ http2 αʔόΛཱͯͯΈ·͠ΐ͏ɻ • Chrome ͷ։ൃऀπʔϧͰ http2 ʹͳ͍ͬͯ Ε͹੒ޭͰ͢ɻ
136. σʔλετϨʔδΛࢼ͢ • CSS΍JSΛ Cache-Control Λ࢖ͬͯΩϟο γϡʹೖΕͯΈ·͠ΐ͏ɻ • ։ൃπʔϧͰ (Cached) ͳϨεϙϯε͕ؼͬͯ ͖͍ͯͨΒ੒ޭͰ͢ɻ
137. σʔλετϨʔδΛࢼ͢ • ϩάΠϯΛ੒ޭͤͯ͞Έ·͠ΐ͏ɻ • id/password ΛνΣοΫ͠ɺ߹க͍ͯͨ͠Β੒ޭϨεϙϯ ε (302, Location: "/") ͱڞʹ Set-Cookie ͰΫοΩʔʹ ηογϣϯIDΛೖΕͯΈ·͠ΐ͏ʢηογϣϯID͸ԿͰ ΋Մʣɻ • ϩάΠϯηογϣϯ͕ϦμΠϨΫτ͞Εɺ `Login Success!` ͕දࣔ͞Ε͍ͯͨΒ੒ޭͰ͢ɻ
138. JavaScript Τϯδϯʹ͍ͭͯ • ͪͳΈʹࠓͷ script.js ͸׶͑ͯಈ͔ͳ͍Α͏ʹͳͬ ͯ·͢ɻ • ಈ͘Α͏ʹͯ͠Έ͍ͯͩ͘͞ɻͳΜͰಈ͔ͳ͍͔Λ ࢦఠͰ͖ͨΒՃ఺ɻ • DOMΛૢ࡞͠ͳ͕ΒύεϫʔυͷϚεΫΛ֎ͯ͠ɺ දࣔ͢ΔϘλϯͷಈ࡞Λ֬ೝͯ͠Έ͍ͯͩ͘͞ɻ
139. JavaScript Τϯδϯʹ͍ͭͯ • ΋͠Ͱ͖ͨΒಈతʹύεϫʔυೖྗΛνΣο Ϋͤͯ͞Έ͍ͯͩ͘͞ɻ • ೖྗʹԠͯ͡಺༰ΛνΣοΫ͠ɺத਎͕ظ଴ ͢Δ΋ͷ͡Όͳ͔ͬͨΒૹΕͳ͍Α͏ʹͯ͠ Έ͍ͯͩ͘͞ɻ
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