JS对象的深度克隆

 1    function clone() {
 2        var buf;
 3        if(Obj instanceof  Array){
 4            buf=[];
 5            var i=Obj.length;
 6            while(i--){
 7                buf[i]=clone(Obj[i])
 8            }
 9            return buf;
10        }else if(Obj instanceof  Object){
11            buf={};
12            for(var k in Obj){
13                buf[k]=clone(Obj[k]);
14            }
15            return buf;
16        }else{
17            return Obj;
18        }
19    }