Question

可能重复：
What is the most efficient way to clone a JavaScript object?

如何使用以下引用来克隆js对象：

{ ID: _docEl,
  Index: next,
  DocName: _el
}

有什么想法吗？

Answer 1

您必须遍历该对象并复制其所有属性。

然后，如果它的任何属性也是对象，假设你想要克隆它们，你将不得不递归到它们。

这里有各种方法： What is the most efficient way to clone a JavaScript object?

Answer 2

基于thomasrutter's suggestion（未经测试的代码），我就是这样做的：

function cloneObj(obj) {
    var clone = {};

    for (var i in obj) {
        if (obj[i] && typeof obj[i] == 'object') {
            clone[i] = cloneObj(obj[i]);
        } else {
            clone[i] = obj[i];
        }
    }

    return clone;
}

Answer 3

您可以使用jQuery.extend：

// Shallow copy
var newObject = jQuery.extend({}, oldObject);

// Deep copy
var newObject = jQuery.extend(true, {}, oldObject);

以下帖子非常有帮助：

What is the most efficient way to deep clone an object in JavaScript?

Answer 4

JavaScript JS对象克隆

Object._clone = function(obj) {
  var clone, property, value;
  if (!obj || typeof obj !== 'object') {
    return obj;
  }
  clone = typeof obj.pop === 'function' ? [] : {};
  clone.__proto__ = obj.__proto__;
  for (property in obj) {
    if (obj.hasOwnProperty(property)) {
      value = obj.property;
      if (value && typeof value === 'object') {
        clone[property] = Object._clone(value);
      } else {
        clone[property] = obj[property];
      }
    }
  }
  return clone;
};

CoffeeScript JS对象克隆

# Object clone
Object._clone = (obj) ->
  return obj if not obj or typeof(obj) isnt 'object'
  clone = if typeof(obj.pop) is 'function' then [] else {}

  # deprecated, but need for instanceof method
  clone.__proto__ = obj.__proto__

  for property of obj
    if obj.hasOwnProperty property
      # clone properties
      value = obj.property
      if value and typeof(value) is 'object'
        clone[property] = Object._clone(value)
      else
        clone[property] = obj[property]

  clone

现在你可以尝试这样做

A = new TestKlass
B = Object._clone(A)
B instanceof TestKlass => true

Answer 5

function objToClone(obj){
  return (new Function("return " + obj))
}

如何克隆js对象？

5 个答案: