javascript 对象深拷贝

 1     var isType = function(obj, type){
 2         var toString = Object.prototype.toString, undefined;
 3         return    (obj === null && type === "Null") || (obj === undefined && type ==="Undefined") || 
 4         ( toString.call(obj).slice(8,-1) === type);  
 5     };
 6 //类型判断，如果是对象，或者是数组 toString 返回的是[object Object] [object Array]
 7     
 8     var deepCopy = function(result, source){
 9         for(var key in source){
10 
11             var copy = source[key];
12             if(source === source[key]) continue;  //如window.window === window这种情况
13             if(isType(copy,"Object")){// copy Object
14                 result[key] = arguments.callee(result[key] || {}, copy);
15             }else if(isType(copy, "Array")){// copy Array
16                 result[key] = arguments.callee(result[key] || [], copy);
17             }else{// 字符串，数字等
18                 result[key] = copy;
19             }
20         }
21         return result;
22     };
23 
24     var original = {
25         memNum:1,
26         memStr:"this is a string",
27         memObj:{
28             test1: "object in object"
29         },
30         memArr:[
31             "this is another string",
32             {
33                 test2:" object in array"
34             }
35         ]
36     };
37 
38     var copy = deepCopy({},original);
39     copy.memObj.test1="object in copy object";
40 
41     console.log(original.memObj.test1);  //object in object 
42     console.log(copy.memObj.test1);        //object in copy object 
43 //从这里看出，深拷贝了对象original ,在改变新对象的属性时，原对象的属性未受到影响