javascript

深度拷贝(三种方法)：http://blog.csdn.net/flyingpig2016/article/details/52895620

    function deepCopy(obj) {
        return JSON.parse(JSON.stringify(obj));
    }

        function deepCopy(obj){
            var newobj, obj;
            if (obj.constructor == Object){
                newobj = new obj.constructor();
            }else{
                newobj = new obj.constructor(obj.valueOf());//valueOf()方法返回 Array 对象的原始值
            }
            for(var key in obj){
                if ( newobj[key] != obj[key] ){
                    if ( typeof(obj[key]) == 'object' ){
                        newobj[key] = deepCopy(obj[key]);
                    }else{
                        newobj[key] = obj[key];
                    }
                }
            }
            newobj.toString = obj.toString;
            newobj.valueOf = obj.valueOf;
            return newobj;
        }

var cloneObj = function(obj){
    var str, newobj = obj.constructor === Array ? [] : {};
    if(typeof obj !== 'object'){
        return;
    } else if(window.JSON){
        str = JSON.stringify(obj), //系列化对象
        newobj = JSON.parse(str); //还原
    } else {
        for(var i in obj){
            newobj[i] = typeof obj[i] === 'object' ? 
            cloneObj(obj[i]) : obj[i]; 
        }
    }
    return newobj;
};