JavaScript对象ID [英] JavaScript Object Id

问题描述

JavaScript对象/变量是否具有某种唯一标识符？像Ruby一样 object_id 。我不是指DOM id属性，而是某种某种内存地址。

Do JavaScript objects/variables have some sort of unique identifier? Like Ruby has object_id. I don't mean the DOM id attribute, but rather some sort of memory address of some kind.

推荐答案

不，对象不要没有内置标识符，但您可以通过修改对象原型来添加标识符。下面是一个如何做到这一点的例子：

No, objects don't have a built in identifier, though you can add one by modifying the object prototype. Here's an example of how you might do that:

(function() {
    var id = 0;

    function generateId() { return id++; };

    Object.prototype.id = function() {
        var newId = generateId();

        this.id = function() { return newId; };

        return newId;
    };
})();

这就是说，一般来说修改对象原型被认为是非常糟糕的做法。我建议你根据需要手动为对象分配一个id，或者像其他人建议的那样使用 touch 函数。

That said, in general modifying the object prototype is considered very bad practice. I would instead recommend that you manually assign an id to objects as needed or use a touch function as others have suggested.

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