Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Learn JavaScript Well
Search
高見龍
October 25, 2020
Programming
1
1.3k
Learn JavaScript Well
MOPCON 2020 分享主題「打造資深實力 - 你該學好的 JavaScript」
高見龍
October 25, 2020
Tweet
Share
More Decks by 高見龍
See All by 高見龍
為你自己學 Python
eddie
0
590
Generative AI 年會小聚 - AI 教我寫程式
eddie
0
75
讓數據說話:用 Python、Prometheus 和 Grafana 講故事
eddie
0
550
AI 時代的程式語言學習法
eddie
0
120
前端模組解放運動 - importmap
eddie
0
1.4k
Git 和 DevOps - 在混亂的流星群開發流程中找到小確幸
eddie
1
1.1k
模組化前端開發:從亂七八糟到組織有序
eddie
0
1.6k
被 Vue 框架耽誤的建置工具
eddie
2
1k
開開心心寫測試,你的程式碼也會微笑
eddie
1
1.2k
Other Decks in Programming
See All in Programming
AIコーディングワークフローの試行 〜AIエージェント×ワークフローでの自動化を目指して〜
rkaga
2
1.9k
本当だってば!俺もTRICK 2022に入賞してたんだってば!
jinroq
0
280
小さく段階的リリースすることで深夜メンテを回避する
mkmk884
2
150
国漢文混用体からHolloまで
minhee
1
130
AI時代のプログラミング教育 / programming education in ai era
kishida
23
21k
Java 24まとめ / Java 24 summary
kishida
3
270
AWSで雰囲気でつくる! VRChatの写真変換ピタゴラスイッチ
anatofuz
0
120
アプリを起動せずにアプリを開発して品質と生産性を上げる
ishkawa
0
2.2k
Defying Front-End Inertia: Inertia.js on Rails
skryukov
0
400
新卒から4年間、20年もののWebサービスと 向き合って学んだソフトウェア考古学
oguri
8
7.1k
php-fpm がリクエスト処理する仕組みを追う / Tracing-How-php-fpm-Handles-Requests
shin1x1
5
890
Go1.24で testing.B.Loopが爆誕
kuro_kurorrr
0
170
Featured
See All Featured
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
Writing Fast Ruby
sferik
628
61k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
40
2.1k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
280
13k
A Modern Web Designer's Workflow
chriscoyier
693
190k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Producing Creativity
orderedlist
PRO
344
40k
The Pragmatic Product Professional
lauravandoore
33
6.5k
Embracing the Ebb and Flow
colly
85
4.6k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
[RailsConf 2023] Rails as a piece of cake
palkan
53
5.4k
Why Our Code Smells
bkeepers
PRO
336
57k
Transcript
ޒഒላӃ .01$0/ ଧࢿਂመྗ 你該學好的 JavaScript ҝ㟬ࣗݾላ
a.k.a Eddie 愛現! 喜歡冷門的玩具 Ruby/Rails 開發者、講師 Ruby 技術推廣、教育、諮詢 台灣、日本等國內外 Ruby
技術研討會講者 部落格:https://kaochenlong.com 高見龍@eddiekao
ޒഒላӃ .01$0/ 第18刷 發售中 發售中 發售中
ޒഒላӃ .01$0/ Git 小教室
ޒഒላӃ .01$0/ 已絕版
ޒഒላӃ .01$0/ 敬請 期待
ޒഒላӃ .01$0/ ༗ᘋ㐸 電子書
ޒഒላӃ .01$0/ ʮላशෆधཁҝެ࢘ɺҝɼ ෆधཁҝผਓɼҝ你ࣗݾʯ ߴݟཾ
ޒഒላӃ .01$0/ ৬ೈᱪఔࢣʁ
ޒഒላӃ .01$0/ ೖҎ্ɼதڃະᕝ
ޒഒላӃ .01$0/ େߝ
ޒഒላӃ .01$0/ େߝ w+BWB4DSJQUతᢛෆ wಹࠣ༗झత+BWB4DSJQUޠ๏എޙతނࣄ w你ٕ֘ೳᴍᏐᴍࡏṜࠣํʂ wኺ৽ख্࿏౸അ్ࣝ
ޒഒላӃ .01$0/ DISCLAIMER 本次分享內容可能隱含部份商業或課程置入訊 息,請謹慎評估!
ޒഒላӃ .01$0/ ᪑ෆ
ޒഒላӃ .01$0/ ʮՖऒᚙɼ+BWB4DSJQUಹॄኄᗞઃܭʂʯ ᢛෆ
ޒഒላӃ .01$0/ ʮੈք্༗ၷछఔࣜޠݴɼ Ұछඃഃ౸ष಄ɼ另Ұछᔒਓ༻ʯ $ ೭#KBSOF4USPVTUSVQ ᢛෆ
ޒഒላӃ .01$0/ +4-JOU ᢛෆ
ޒഒላӃ .01$0/ +4-JOU Մೳ။ᩋ你᧷ಘࣗݾෆ။ሜఔࣜʂ ᢛෆ
ޒഒላӃ .01$0/ function hello() { return "world"; } function hello()
{ return "world"; } ᢛෆ
ޒഒላӃ .01$0/ 㑌छఔࣜޠݴ༗ᢛෆతҰ໘ ᢛෆ
ޒഒላӃ .01$0/ ෆཁੋ᪑ஶ鄉ຽҰىഃ ᢛෆ
ޒഒላӃ .01$0/ ༗झޠ๏എޙతނࣄ
ޒഒላӃ .01$0/ 你ಓએࠂੋዎኄҰճࣄ嗎ʁ ༗झޠ๏
ޒഒላӃ .01$0/ ᏓᏐએࠂ ༗झޠ๏
ޒഒላӃ .01$0/ var a = 1; console.log(a); // 會印出什什麼? ༗झޠ๏
1
ޒഒላӃ .01$0/ console.log(a); // 會印出? var a = 1; ༗झޠ๏
undefined
ޒഒላӃ .01$0/ ᏓᏐఏঢ 7BSJBCMF)PJTUJOH ༗झޠ๏
ޒഒላӃ .01$0/ var a; console.log(a); // 所以印出 undefined a =
1; ༗झޠ๏ 被拉到上面?
ޒഒላӃ .01$0/ ฤᩄWTᩄ $PNQJMBUJPOWT*OUFSQSFUBUJPO ༗झޠ๏
ޒഒላӃ .01$0/ ݐཱظWTࣥߦظ $SFBUJPO1IBTFWT&YFDVUJPO1IBTF ༗झޠ๏
ޒഒላӃ .01$0/ ݐཱظ Ḽ໊ʢ*EFOUJpFSʣ ਐߦॳ࢝Խ 1A 1B ༗झޠ๏
ޒഒላӃ .01$0/ ࣥߦظ ࣥߦവᏐො值 2 ༗झޠ๏
ޒഒላӃ .01$0/ var a = 1; console.log(a); ༗झޠ๏ ݐཱظ var
a; console.log(a); undefined 1A 1B
ޒഒላӃ .01$0/ var a = 1; console.log(a); ༗झޠ๏ ࣥߦظ a
= 1; console.log(a); 1 2 2
ޒഒላӃ .01$0/ ၷ֊ஈ ༗झޠ๏
ޒഒላӃ .01$0/ console.log(a); var a = 1; ༗झޠ๏ ݐཱظ console.log(a);
var a; undefined 1A 1B
ޒഒላӃ .01$0/ console.log(a); var a = 1; ༗झޠ๏ ࣥߦظ console.log(a);
a = 1; undefined 1 2 2
ޒഒላӃ .01$0/ খଌᱛ ༗झޠ๏
ޒഒላӃ .01$0/ var a = 1; var a; console.log(a); //
會印出什什麼? ༗झޠ๏ 1
ޒഒላӃ .01$0/ if (false) { var a = 1; }
console.log(a); // 會印出什什麼? ༗झޠ๏ undefined
ޒഒላӃ .01$0/ 另ҰछᏓᏐએࠂ ༗झޠ๏
ޒഒላӃ .01$0/ console.log(a); // 會印出什什麼? let a = 1; ༗झޠ๏
Reference Error
ޒഒላӃ .01$0/ ҼҝMFUෆ။ᏓᏐఏঢʁ ༗झޠ๏
ޒഒላӃ .01$0/ console.log(a); let a = 1; ༗झޠ๏ ݐཱظ console.log(a);
let a; 1A TDZ
ޒഒላӃ .01$0/ console.log(a); let a = 1; ༗झޠ๏ ࣥߦظ console.log(a);
a = 1; Reference Error 2
ޒഒላӃ .01$0/ ࣌ࢮე 5%;5FNQPSBM%FBE;POF ༗झޠ๏
ޒഒላӃ .01$0/ let a = 1; console.log(a); // 會印出什什麼? ༗झޠ๏
ޒഒላӃ .01$0/ let a = 1; console.log(a); ༗झޠ๏ ݐཱظ let
a; console.log(a); 1A TDZ
ޒഒላӃ .01$0/ let a = 1; console.log(a); ༗झޠ๏ ࣥߦظ a
= 1; console.log(a); 1 2 2
ޒഒላӃ .01$0/ MFU৽൛తWBS Ҏޙ༻MFUबྃʁ ༗झޠ๏
ޒഒላӃ .01$0/ വᏐએࠂ ༗झޠ๏
ޒഒላӃ .01$0/ sayHello(); function sayHello() { console.log('hello'); } ༗झޠ๏ ?
ޒഒላӃ .01$0/ sayHello(); function sayHello() { console.log('hello'); } ༗झޠ๏ ݐཱظ
1A 1B sayHello(); function sayHello() { console.log('hello'); } 2
ޒഒላӃ .01$0/ sayHello(); function sayHello() { console.log('hello'); } ༗झޠ๏ sayHello();
function sayHello() { console.log('hello'); } 2 ࣥߦظ hello
ޒഒላӃ .01$0/ { } ༗झޠ๏ 物件? Block?
ޒഒላӃ .01$0/ { hello: '哈囉' } ༗झޠ๏ 物件
ޒഒላӃ .01$0/ { hello: for (var i = 0; i
< 10; i++ ) { if (i % 2 === 0) { continue hello; } console.log(i); } } ༗झޠ๏ label label Block
ޒഒላӃ .01$0/ + 加號? 十字架? ༗झޠ๏
ޒഒላӃ .01$0/ DPFSDJPO<ˋkoʊˈɝː.ʃən> 5IFVTFPGGPSDFUPQFSTVBEFTPNFPOFUPEP TPNFUIJOHUIBUUIFZBSFVOXJMMJOHUPEP ༗झޠ๏
ޒഒላӃ .01$0/ +'' // 0 +[] // 0 +{} //
NaN +-1 // -1 +true // 1 +false // 0 +undefined // NaN +null // 0 ༗झޠ๏
ޒഒላӃ .01$0/ [] + [] // ? [] + {}
// ? {} + [] // ? ༗झޠ๏
ޒഒላӃ .01$0/ [] + [] ༗झޠ๏
ޒഒላӃ .01$0/ ༗झޠ๏
ޒഒላӃ .01$0/ [] + [] [].toString() + [].toString() ༗झޠ๏ 空字串
空字串
ޒഒላӃ .01$0/ [] + {} ༗झޠ๏
ޒഒላӃ .01$0/ [] + {} [].toString() + {}.toString() ༗झޠ๏ '[object
Object]' 字串串 空字串
ޒഒላӃ .01$0/ {} + [] ༗झޠ๏ Block
ޒഒላӃ .01$0/ [] + {} Block 後⾯面跟了了 +[] ༗झޠ๏ 0
ޒഒላӃ .01$0/ [] + [] // '' [] + {}
// '[object Object]' {} + [] // 0 ༗झޠ๏
ޒഒላӃ .01$0/ /B//PU"/VNCFS ༗झޠ๏
ޒഒላӃ .01$0/ console.log(typeof NaN); // 會印出什什麼? number ༗झޠ๏
ޒഒላӃ .01$0/ /B/ੋҰछᏐࣈ ୠሏ༻ိදࣔʮෆੋᏐࣈʯ ༗झޠ๏
ޒഒላӃ .01$0/ ʮݸᥒʯ᪑ʮݸᥒʯతࠩผʁ ༗झޠ๏
ޒഒላӃ .01$0/ ʮݸᥒෆ။ൺֱܕผʁʯ ༗झޠ๏
ޒഒላӃ .01$0/ ݸᥒ᪑ݸᥒతࠩผʁ ༗झޠ๏
ޒഒላӃ .01$0/ ཧղࡉઅ ༗झޠ๏
ޒഒላӃ .01$0/ 你ٕ֘ೳᴍᏐᴍࡏṜࠣํʂ ਓੜۤ
ޒഒላӃ .01$0/ ಓཧେՈಓɼୠೳ၏౸తᔒଟগ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ٕೳᴍᏐ༗ݶ ਓੜᴍᏐ
ޒഒላӃ .01$0/ Ռཁࢿࡏ+BWB4DSJQUత ਓੜᴍᏐ
ޒഒላӃ .01$0/ ਂೖ+BWB4DSJQU w݅ಋ wവᏐ$MPTVSF wUIJT wඇಉ㑊႔ཧ w&4.PEVMF
ޒഒላӃ .01$0/ ֘ላલᐽՍ嗎ʁ֘ላ哪Ұݸʁ ਓੜᴍᏐ "
ޒഒላӃ .01$0/ ؐཁෆཁላK2VFSZʁ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ֘ላࢿྉ݁ߏɺԋࢉ๏嗎ʁ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ؐ༗ॄኄʁ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ൛ຊ߇੍ ਓੜᴍᏐ 非業配
ޒഒላӃ .01$0/ "TTFUଧแ۩ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ཆจ݅తश׳ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ӳจ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ࢿҰఆ༗෩ᯃɼٕज़ࢿ༗ᩲ༗ഛɼ ਃߪલጯৄ閱ެ։說໌ॻɻ ਓੜᴍᏐ
ޒഒላӃ .01$0/ ኺ৽ख্࿏౸അ్ࣝ
ޒഒላӃ .01$0/ ૉਓ৬ޭతՄೳੑʁ ৽खᢛഅ
ޒഒላӃ .01$0/ զෆੋՊ൝ඟۀత ৽खᢛഅ
ޒഒላӃ .01$0/ զཁઌላ哪Ұఔࣜޠݴʁ ৽खᢛഅ
ޒഒላӃ .01$0/ ઌ辦๏፤౸ථʂ ৽खᢛഅ
ޒഒላӃ .01$0/ ઌᏓʮ৽खʯ ৽खᢛഅ
ޒഒላӃ .01$0/ ၏ላతํࣜ ৽खᢛഅ
ޒഒላӃ .01$0/ େ෦份తٕज़ඃᚙ໌ग़ိ ੋཁղܾಛఆత ৽खᢛഅ
ޒഒላӃ .01$0/ അ్ࣝ೭༌ೖἫ ৽खᢛഅ
ޒഒላӃ .01$0/ ॏᴍɿจ݅ن֨ख ࣗզ ৽खᢛഅ
ޒഒላӃ .01$0/ ৽खᢛഅ
ޒഒላӃ .01$0/ ৽खᢛഅ
ޒഒላӃ .01$0/ ཧղࡉઅ ৽खᢛഅ
ޒഒላӃ .01$0/ อ࣋ح৺ ৽खᢛഅ
ޒഒላӃ .01$0/ ෆཁ࠶૬৴ᔒ༗ࠜᎦత說๏ྃ ৽खᢛഅ
ޒഒላӃ .01$0/ ҆፻ʁ ৽खᢛഅ
ޒഒላӃ .01$0/ ᩇॻʂ ৽खᢛഅ
ޒഒላӃ .01$0/ ਪનॻ ৽खᢛഅ
ޒഒላӃ .01$0/ ਪનॻ w:PV%POU,OPX+4ܥྻ w᮷阱ʂޡղʂఱॏ৽ೝࣝ+BWB4DSJQUʂ w&MPRVFOU+BWB4DSJQU w&GGFDUJWF+BWB4DSJQU
ޒഒላӃ .01$0/ 閱ᩇݪ࢝ᛰ ৽खᢛഅ
ޒഒላӃ .01$0/ ( function( global, factory ) { "use strict";
// 略略 } )( typeof window !== "undefined" ? window : this, function( window, noGlobal ) { // 略略 IIFE ৽खᢛഅ
ޒഒላӃ .01$0/ അ్ࣝ೭༌ग़Ἣ ৽खᢛഅ
ޒഒላӃ .01$0/ ࢪൺडߋ༗ಘ ৽खᢛഅ
ޒഒላӃ .01$0/ ʮՌ你ߨ౸࿈你Ѩ嫲ᡒత懂తʯ ৽खᢛഅ
ޒഒላӃ .01$0/ 㑚Ө ࣗݴࣗޠʂ ৽खᢛഅ
ޒഒላӃ .01$0/ ሜจষ ৽खᢛഅ
ޒഒላӃ .01$0/ ሜจষෆੋҝྃߚɺ ࣕੋҝྃࢥߟᢛࣗզሣ ৽खᢛഅ
ޒഒላӃ .01$0/ J5)PNFਓᩱ ৽खᢛഅ
ޒഒላӃ .01$0/ 4JEF1SPKFDU ৽खᢛഅ
ޒഒላӃ .01$0/ ৽ख্࿏ ৽खᢛഅ
ޒഒላӃ .01$0/ ෆཁযྀɺෆཁᛇ
ޒഒላӃ .01$0/ photo by redjar
ޒഒላӃ .01$0/ photo by Quality & Style
ޒഒላӃ .01$0/ Ҏ্Ͱ͢ʂ
ޒഒላӃ .01$0/ 歡迎加 好友