js深度克隆对象

用js实现对象克隆最关键的两点就是：var objClone = new this.constructor();和objClone[key] = this[key].Clone();。一个实现相同对象创建，一个实现深度克隆。

Object.prototype.Clone = function(){

var objClone;

if (this.constructor == Object){

objClone = new this.constructor();

}else{

objClone = new this.constructor(this.valueOf());

}

for(var key in this){

if ( objClone[key] != this[key] ){

if ( typeof(this[key]) == ‘object’ ){

objClone[key] = this[key].Clone();

}else{

objClone[key] = this[key];

}

}

}

objClone.toString = this.toString;

objClone.valueOf = this.valueOf;

return objClone;

}

不用原型方式实现，万一哪天浏览器厂商一更新可能就会有原生的Clone方法了，只写个方法

function clone(obj){

var objClone;

if (obj.constructor == Object){

objClone = new obj.constructor();

}else{

objClone = new obj.constructor(obj.valueOf());

}

for(var key in obj){

if ( objClone[key] != obj[key] ){

if ( typeof(obj[key]) == ‘object’ ){

objClone[key] = clone(obj[key]);

}else{

objClone[key] = obj[key];

}

}

}

objClone.toString = obj.toString;

objClone.valueOf = obj.valueOf;

return objClone;

}