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JSerのための ブラウザコードリーディング (テスト編)
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Edward Fox
April 28, 2017
Programming
3
2.4k
JSerのための ブラウザコードリーディング (テスト編)
Meguro.es x Gotanda.js #1 in Drecom
https://meguroes.connpass.com/event/49543/
Edward Fox
April 28, 2017
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Transcript
JSerͷͨΊͷ ϒϥβίʔυϦʔσΟϯά ʢςετฤʣ EDWARD FOX @Meguro.es x Gotanda.js #1 2017/04/28
Edward Fox - Developer @ Repro Inc. - RoR, JavaScript,
AWS - Vue.js, HTTP/2, WebAssembly
લճͷMeguro.esͰ ͜ΜͳΛͤͯ͞Β͍· ͨ͠
None
ϒϥβͷΠϯεϖΫλʹ console.logͱೖྗͨ͠༰ ͕࣮ࡍʹදࣔ͞ΕΔ·Ͱ
ࠓճ͏ͪΐ͍ ࣮ફతͳΛ͠·͢
1. ຊ൪ڥͰΤϥʔ͕ى͖ͨ 2. ௐࠪͯ͠શવΘ͔ΒΜ 3. WebKitͷϦϙδτϦͰgrep 4. ςετίʔυʹώοτͨ͠
ςετίʔυΛಡΜͰ͍͘ͱ ৭ʑͱֶͼ͕͋ͬͨͷͰ ͍͔ͭ͘Λհ
WebKitͷιʔείʔυ֓؍
LayoutTests
1. DOM 2. Security 3. Performance #1 4. Performance #2
1. DOM
LayoutTests/dom/level2/core/ setAttributeNS10.html
ظ͢Δಈ࡞: > setAttributeʹෆਖ਼ͳจࣈ ྻΛ͢ͱ InvalidCharacterError͕ ্͕Δ͜ͱ
ϒϥβͰ։͘
SUCCESS!
2. Security
LayoutTests/security/ contentSecurityPolicy/image- with-blob-url-blocked-by-img- src-star.html
ظ͢Δಈ࡞: > ϖʔδʹ”image-src *”ͷ CSPϔομ͕ଘࡏ͢Δ߹ɺ blob URLΛ௨ͯ͡࡞͞Εͨ ը૾ͷಡΈࠐΈ͕ ϒϩοΫ͞ΕΔ͜ͱ
ϒϥβͰ։͘
PASS!
3. Performance #1
LayoutTests/perf/array-nested- loop.html
ظ͢Δಈ࡞: > ωετ͞Εͨྻͷ ܁Γฦ͠ॲཧͷ࣌ؒܭࢉྔ͕ O(n^2)Ͱ૿Ճ͢Δ͜ͱ
magnitude iterations 2 112352 4 52595 8 118454 16 75968
32 27994 64 7237 128 2277 256 699 512 186 1024 47 2048 12 4096 4
͡Ίͷํ͕҆ఆ ͠ͳ͍͕ɺ16Ҏ߱ظ ௨ΓͷύϑΥʔϚϯεྼԽ͕ ݟΒΕΔ
҆ఆ͠ͳ͍ཧ༝: ϒϥβͷJITίϯύΠϧʹ ͷ͔ͬΔ·Ͱͷϥάʁ ʢৄ͍͠ਓڭ͍͑ͯͩ͘͞ʣ
2. Performance #2
LayoutTests/perf/document- contains.html
ظ͢Δಈ࡞: > document.contains() ͷ ࣌ؒܭࢉྔ͕O(1)Ͱ͋Δ͜ͱ
magnitude iterations 2 70107 4 59787 8 95958 16 129782
32 128047 64 130236 128 140427 256 122163 512 115772 1024 130717 2048 117249 4096 138466
Γ͡Ίෆ҆ఆ͕ͩɺ 16͘Β͍͔ΒҰఆͷΛ อ͍ͬͯΔ
·ͱΊ
Undocumentedͳ༷ڍಈ Ͱ͋ͬͯɺϒϥβͷ ςετίʔυ ͪΌΜͱ͋ͬͨΓ͢Δ
=> ༷͚ͩͰͳ͘ɺ ࣮ʹͱͮ͘ڍಈ͕ ཧղͰ͖Δ
ϑΝΠϧ໊આ໌తͰɺ HTML/JSͰॻ͔Ε͍ͯΔͷͰ ࠶ݱ؆୯
=> ϒϥβͷςετίʔυ ΛಡΜͰ͍͘͜ͱͰɺ JavaScriptΛॻ͘ਓؒʹ ͱֶͬͯͼ͕͋Δ
͓·͚
WebKitϦϙδτϦશମͰ 27ສϑΝΠϧ͕͋ΔͷͰ grepͳͲ͕ΠνΠνਏ͍
- git status: 1-2 - git grep: 10ऑ
ରࡦ1: ιʔείʔυΛ෦తʹ μϯϩʔυ͢Δ
ରࡦ2: maxvodesͱ͍͏ ΧʔωϧύϥϝʔλͷΛ ্͛Δ
edwardkenfox.com/blog/ browser-test-code-for-jsers/