js对象克隆

function clone(obj){
    var copy, name, src,
    type = Object.prototype.toString.call(obj);
    if(type == "[object Array]"){
        copy = [];
    }else if(type == "[object Object]"){
        copy = {};
    }else{
        return obj;
    }
    for(name in obj){
        src = obj[name];
        copy[name] = clone(src);
    } 
    return copy;
}