js 对象的深度克隆代码实现

function clone(obj){
    if(!obj ||typeof(obj) != 'object') return obj;
    var r = Array.prototype.splice === obj.splice ? []:{};
    for(var i in obj){
        if(obj.hasOwnProperty(i)){
            r[i] = clone(obj[i]);
        }
    }
    return r ;
}
//数组、对象都可以for in,同时针对对象必须需要判断hasOwnProperty属性，以防克隆原型链上的属性

function deepCopy(obj)
{
		var type = Object.prototype.toString.call(obj);
		if(typeof obj !== "object" || obj === null)	//boolean, number, string, undefined, function, null
			return obj;
		
		//object(Date, Boolean, Number, String, RegExp, Array, Object)
		if(type === "[object Date]")			//object Date
			return new Date(obj.valueOf());
		if(type === "[object Boolean]")			//object Boolean
			return new Boolean(obj.valueOf());
		if(type === "[object Number]")			//object Number
			return new Number(obj.valueOf());
		if(type === "[object String]")			//object String
			return new String(obj.valueOf());
		if(type === "[object RegExp]")			//object RegExp
			return new RegExp(obj.valueOf());
		if(type === "[object Object]" || type === "[object Array]")
		{
			var newObj = (type === "[object Object]") ? Object.create(Object.getPrototypeOf(obj)) : [];
			var props = Object.getOwnPropertyNames(obj);
			for(var item in props)
			{
				var des = Object.getOwnPropertyDescriptor(obj, props[item]);
				if(des.hasOwnProperty("value"))
					des.value = arguments.callee(des.value);		
				Object.defineProperty(newObj, props[item], des);
			}
			return newObj;
		}
		return obj; 
}

function clone(Obj) {
    var buf;   
    if (Obj instanceof Array) {
        buf = [];  // 创建一个空的数组
        var i = Obj.length;
        while (i--) {
            buf[i] = clone(Obj[i]);
        }
        return buf;
    } else if (Obj instanceof Object){
        buf = {};  // 创建一个空对象
        for (var k in Obj) {  // 为这个对象添加新的属性
            buf[k] = clone(Obj[k]);
        }
        return buf;
    }else{
        return Obj;
    }
}