js深度克隆对象

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; 
}