Javascript深度复制对象 [英] Javascript deep copying object

问题描述

可能重复：

克隆JavaScript对象的最有效方法是什么？

我有一个这样的对象：

User = {    
  name: "user",
  settings: {
    first: "1",
    second: "2"    
  }    
}

和第二个：

user1 = {
  name: "user1",
  settings: {
    second: "3"
  }
}

现在我想将user1的自定义值复制到User中，使用：

now I want to copy user1's custom values into User, using:

    for(var key in user1){
        User[key] = user1[key];
    }

结果用户将：

User = {
  name: "user1",
  settings: {
    second: "3"
  }
}

我想完全替换User.settings，而我只想更换settings.second。

User.settings has been entirely replace while I wanted only settings.second to be replaced.

如何在不知道主对象有多少子对象的情况下实现这一点？

How to achieve this, without knowing how much child object the main object have?

推荐答案

我发现最好的方法是：

http://andrewdupont.net/2009/08/28/deep-extending-objects-in-javascript/

Object.deepExtend = function(destination, source) {
  for (var property in source) {
    if (typeof source[property] === "object" &&
     source[property] !== null ) {
      destination[property] = destination[property] || {};
      arguments.callee(destination[property], source[property]);
    } else {
      destination[property] = source[property];
    }
  }
  return destination;
};


Object.extend(destination, source);

这个怎么样？

    function clone(destination, source) {
        for (var property in source) {
            if (typeof source[property] === "object" && source[property] !== null && destination[property]) { 
                clone(destination[property], source[property]);
            } else {
                destination[property] = source[property];
            }
        }
    };

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