使用原生js实现复制对象及扩展

使用原生js实现复制对象，扩展对象，类似JQuery中的extend()方法

var obj1 = {
    name:'xiaoli1',
    age:20
};
var obj2 ={
    name:'xiaoli2',
    age:21,
    speak:function(){
        alert("hi,I am"+name);
    }
};
var obj3={
    age:22
}

//复制对象方法
function cloneObj(oldObj){
    if(typeof(oldObj)!='object')
        return oldObj;
    if(typeof(oldObj==null))
        return oldObj;
    var newObj=Object();
    for(var i in oldObj)
        newObj[i]=cloneObj(oldObj[i]);
    return newObj;
}

//扩展对象
function extendObj(){
    var args = arguments; //将传递过来的参数数组赋值给args变量
    if(args.length<2)
        return;
    var temp = cloneObj(args[0]);
    for(var n=1;n<args.length;n++){
        for(var i in args[n])
            temp[i]=args[n][i];
    }
    return temp;

}
var obj=extendObj(obj1,obj2,obj3);
console.log(obj); //{ name: 'xiaoli2', age: 22, speak: [Function] }
console.log(obj1); //{ name: 'xiaoli2', age: 22, speak: [Function] }
console.log(obj2); //{ name: 'xiaoli2', age: 21, speak: [Function] }
console.log(obj3); //{ age: 22 }