Object.prototype.deepCopy=function(){
    var obj=arguments[0]||{};
    for(var i in this){
        if(this.hasOwnProperty(i)){
            if(isSimpleObject(this[i])){
                obj[i]={};
                this[i].deepCopy(obj[i]);
            }else if(isArray(this[i])){
                obj[i]=[];
                this[i].deepCopy(obj[i]);
            } else {
                obj[i]=this[i];
            }
        }
    }
    return obj;
}

var isSimpleObject=function (obj) {
    return Object.prototype.toString.call(obj)===‘[object Object]‘;
}

var isArray=function (arr) {
    return Object.prototype.toString.call(obj)===‘[object Array]‘;
}

var obj={x:1,y:[1,2,3],z:{x:1},n:function(){return this.x}}

var obj1=obj.deepCopy();

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