javascript 如何克隆js对象？
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How to clone js object?
提问by Harold Sota
Possible Duplicate:
What is the most efficient way to clone a JavaScript object?
How to clone js object with out reference like these:
如何在没有引用的情况下克隆 js 对象，如下所示：
{ ID: _docEl,
Index: next,
DocName: _el
}
Any ideas?
有任何想法吗？
采纳答案by thomasrutter
You'll have to iterate over the object and make copies of all its properties.
您必须遍历对象并复制其所有属性。
And then if any of its properties are also objects, assuming you want to clone those too, you'll have to recurse into them.
然后如果它的任何属性也是对象，假设你也想克隆它们，你将不得不递归到它们。
There's various methods for doing this here: What is the most efficient way to clone a JavaScript object?
这里有多种方法可以执行此操作： 克隆 JavaScript 对象的最有效方法是什么？
回答by BoltClock
Here's how I'd do it, based on thomasrutter's suggestion(untested code):
根据thomasrutter 的建议（未经测试的代码），我是这样做的：
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;
}
回答by Mahmoodvcs
You can use jQuery.extend:
您可以使用 jQuery.extend：
// Shallow copy
var newObject = jQuery.extend({}, oldObject);
// Deep copy
var newObject = jQuery.extend(true, {}, oldObject);
The following post is so helpful:
以下帖子很有帮助：
What is the most efficient way to deep clone an object in JavaScript?
回答by the-teacher
JavaScript JS object clone
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 object 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
Now you can try to do that
现在你可以尝试这样做
A = new TestKlass
B = Object._clone(A)
B instanceof TestKlass => true
回答by Floyd
function objToClone(obj){
return (new Function("return " + obj))
}
