实现对象深度克隆（deepClone）的三种方案

转：http://www.cnblogs.com/wangzhichao/archive/2013/04/11/3014419.html

方案一：利用现代浏览器支持的JSON对象做一次中转，实现深度克隆。（IE6、IE7不支持原生JSON对象,可载入json2.js补丁来达到兼容）感谢rekey提供此方案。JSON.stringify()与JSON.parse()详细信息请点击这里

var deepClone = function (obj) { var _tmp,result;
    _tmp = JSON.stringify(obj);
    result = JSON.parse(_tmp); return result;
} var obj1 = {family:{brother:"wangzhipeng",father:"wanglicai",mother:"sunaiyun"},name:"gino",sex:"male",age:"27"}; var obj2 = deepClone(obj1);
obj1.family.brother = "close";
console.log(obj1); 
console.log(obj2); 

 

方案二：确定参数类型为object （这里仅指object literal、Array literal）后，复制源对象的键/值到目标对象，否则直接返回源对象。

注：下面这个函数只能说基本满足生产需求，如果参数是Dom对象、new Object ()的话,就会产生功能性错误，要兼容参数的所有数据类型，请参考：http://stackoverflow.com/a/4460624/2109599

var deepClone = function fnDeepClone(obj){ var result = typeof obj.splice === 'function'?[]:{},
    key; if (obj && typeof obj === 'object'){ for (key in obj ){ if (obj[key] && typeof obj[key] === 'object'){
                result[key] = fnDeepClone(obj[key]);//如果对象的属性值为object的时候，递归调用deepClone，即再把某个值对象复制一份到新的对象的对应值中 }else{
                result[key] = obj[key];//如果对象的属性值不为object的时候，直接复制参数对象的每一个键/值到新对象对应的键/值中  }
            
        } return result;
    } return obj;
    

} //test array var arry1= ["a","b","c","d"]; var arry2 = deepClone(arry1);
arry1.pop();
console.log(arry1);
console.log(arry2); //test object var obj1 = {name:"gino",sex:"male",age:27,favorite:"pingpang",family:{brother:"zhipeng",mother:"SunAiyun",father:"WangLicai"}}; var obj2 = deepClone(obj1);
obj1.family.brother = "close";
console.log(obj1);
console.log(obj2);

 

 方案三：利用数组的Array.prototype.forEach和其他一些ECMAScript 5中的Object.*函数。经测试，当值的类型为object的时候，会出现功能错误。个人水平有限，没看懂这个函数，如有朋友能帮忙修正下此函数，万分感激。 链接

var deepClone = function (o){ var copy = Object.create( Object.getPrototypeOf(o) ); var propNames = Object.getOwnPropertyNames(o);
 
  propNames.forEach(function(name){ var desc = Object.getOwnPropertyDescriptor(o, name);   
    Object.defineProperty(copy, name, desc);        
  }); return copy;
} var obj1 = {family:{brother:"wangzhipeng",father:"wanglicai",mother:"sunaiyun"},name:"gino",sex:"male",age:"27"}; var obj2 = deepClone(obj1);
obj1.sex = "close";
console.log(obj1); 
console.log(obj2);