racerun的专栏

H5应用需要点击后才有声音

JS RegExp 100000000 to 100.000.000

1)a??b 如果 a 为 undefined 或 null 则返回b ,否则直接返回a; 2)a?.b 如果 a 为 undefined 或 null 则返回undefined ,否则直接返回a.b; var obj ={} console.log(obj?.a?.b ?? 233 ) //233 var obj={a:{b:1}} console.log(obj?.a?.b??233) //1 ------------------------------------------.

Long Term Support LTS 1. Install node.js node -v npm -v 2. Init proj npm init init proj desc 3.Install webpack 1)npm inistall webpack webpack-cli -g 2)npm inistall webpack webpack-cli --save-dev 4.Run webpack 1)webpa...

npx run build

CommonJS var TT = require("./TT.js"); module.exports ={ }

lettimeLine=new TimeLine(); timeLine.addLabel("1",0).to(this.adIcon,{rotation:10},60) timeLine.addLabel("2",0).to(this.adIcon,{rotation:-10},120) timeLine.addLabel("3",0).to...