yujie的博客

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作用域var a=b=10;(function f(){ var a=b=11;})()console.log(a); //10console.log(b); //11var a=1function fn(){ var a=2 b=3}fn()console.log(a) //1console.log(b) //3var a=1let...

一、用Promise来说明单一职责原则、开放封闭原则。function loadImg(src){ var promise = new Promise(function(resolve,reject){ var img = document.createElement('img') img.onload = function(){ ...