JavaScript 深拷贝

 1 //代码读书记录，请勿转载。 产权非本人所有。  
   var util={
 2          getType:function(o){    //判断对象类型
 3              var _t;
 4              return ((_t = typeof(o)) == "object" ? o==null && "null" || Object.prototype.toString.call(o).slice(8,-1):_t).toLowerCase();
 5          },
 6           deepClone:function(source){    //深拷贝
 7               var destination=this.getType(source);
 8              destination=destination===‘array‘?[]:(destination===‘object‘?{}:source);
 9              for (var p in source) {
10                 if (this.getType(source[p]) === "array" || this.getType(source[p]) === "object") {
11                     destination[p] = this.getType(source[p]) === "array" ? [] : {};
12                      destination[p]=arguments.callee(source[p]);
13                  } else {
14                     destination[p] = source[p];
15                  }
16              }
17            return destination;
18        }
19      };
20 
21 
22      var obj1={attr:100};
23      var obj2=util.deepClone(obj1);    //将obj1深拷贝到obj2
24      obj2.attr=200;    //修改obj2的属性值
25      console.log(obj1.attr);    //obj1属性值未发生变化