JS中的继承和Extend

Extend

// 例子：浅拷贝var a = {};var b = {c:1, d:2};for(var i in b){  a[i] = b[i];}// 封装，对引用类型（数组、对象）没有用function extend(sub,sup){  for(var i in sup){    sub[i] = sup[i];  }}

继承

var People = function (){  this.name = 'rzy';}People.prototype.getName = function(){  return this.name;}var Man = function (){  this.sex = 'male';  People.call(this);}/* 土鳖方法，加入后期People中的name改变了，那Man的值也会改变Man.prototype = People.prototype;var man = new Man();man.getName(); // rzy*/Man.prototype = new People();Man.prototype.constructor = Man;var man = new Man();man.getName();  // rzy