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Chrome Devtools使いこなしたい/I want to master devtool
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果物リン
February 02, 2022
Programming
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Chrome Devtools使いこなしたい/I want to master devtool
みんなの技教えて
果物リン
February 02, 2022
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Transcript
Chrome DevTool s ͍͜ͳ͍ͨ͠ ՌϦϯ גࣜձࣾελσΟετ 2022/02/02 Studist Lightning Talks
#46
ࣗݾհ • Vue.js͕͖ • Լखͷԣ͖આ͋Δ • ͘͠શʹཧղͨ͠ͱ φχϞϫΧϥφΠͷڱؒ
DevTools͍͜ͳ͍ͨ͠ ಛʹ໘നΈͷͳ͍εϥΠυ
Tips • ࠓͷDevToolsຊޠԽͰ͖Δͧʂ
• Perfomance • Element • Console • Sorce
Performanceλϒ • هதͷ͕ͱΕΔ
͜Μͳײ͡
͜ͷลΛ͛Δ
͔͔ͬͯΔ࣌ؒ
ԿΛࢦͯ͠վળ͍͖͔ͯ͘͠ • ࡉ͔͘ௐ͢ͱΓ͕ͳ͍ • Webϑϩϯτతʹ60FPSΛࢦ͢ͷ͕Αͦ͞͏ • Ϣʔβʔͷૢ࡞ʹରͯ͠100msͰԿΒ͔ͷϦΞΫγϣϯ͕͋Δ ͱຬײ͋Δ • 1000ms
͑͜ΔͳΒ͙Δ͙Δ͢Δͱ͔
ͳΜ͔͍ͳʁͱࢥͬͨΒ PerformanceλϒΛݟͯΈΑ͏
͓͢͢Ίຊ
Elementλϒ HTML Style
Element HTML
Cmd+C, VͰίϐϖ DelͰআ μϒϧΫϦοΫͰฤू
Cmd+C, VͰίϐϖ DelͰআ μϒϧΫϦοΫͰฤू
λάͷߏ͍͡Γ͍ͨͱ͖ HTMLͱͯ͠ฤू
Element HTML Style
Element HTML Style
બதͷElementͷ style λάͱͯ͠ࢦఆ
બதͷElementͷ style λάͱͯ͠ࢦఆ ৽͍͠ελΠϧͷઃఆɺআ
બதͷElementͷ style λάͱͯ͠ࢦఆ ৽͍͠ελΠϧͷઃఆɺআ
ϚεϗΠʔϧ ΩʔϘʔυͰΓସ͑ΒΕΔ
ίʔυ͍ͬͯ͡ίϯύΠϧ →ϒϥβΛݟΔΑΓ ϒϥβ্Ͱฤूͯ֬͠ೝ →ίʔυʹөͷ΄͏͕ૣ͍
ελΠϧͷద༻༏ઌ
hoverঢ়ଶͰݻఆ͍ͨ͠ͱ͖ ։͘
% ࢦఆͱ͔ px ͰͰΔ ܭࢉࡁΈ Computed #FFF -> rgb(255,
255, 255) ʮ͜͜ʹͳ͔ͬͨΒͳ͍Ͱ͢Ͷʯ
͖ͨͷͰElement͜͜·Ͱ
ConsoleͱSource
debugger • ιʔείʔυʹ debugger ΛࠐΉͱ DevToolsΛ։͍͍ͯΕͦ͜Ͱࢭ·Δ
ιʔελϒʹͳΔ ϒϨʔΫϙΠϯτࠐ·ͳͯ͘Α͍
breakpoint Ͱࢭ·ͬͯΔ࠷தͷconsoleͦͷείʔϓ
͓͢͢Ίهࣄ • $_, $1, $(), $$(),ͱ͔͓͠Ζ͍Α • Chrome DevTools Console
Ͱ͑ΔศརͳίϚϯυ https://zenn.dev/lollipop_onl/articles/eoz-devtools-console- commands