为什么我不能在IE8（javascript）上扩展localStorage？ [英] Why can't I extend localStorage on IE8 (javascript)?

问题描述

我想向localStorage添加2个方法。我的目标是最终得到这样的结果：

I'd like to add 2 methods to localStorage. My goal is to end up with something like this:

localStorage.setObject(key, object);
localStorage.getObject(key);

此解决方案适用于大多数浏览器，但不适用于IE8：

This solution works in most browsers but not IE8:

Storage.prototype.setObject = function(key, value) {
    this[key] = JSON.stringify(value);
}

Storage.prototype.getObject = function(key) {
    return JSON.parse(this[key]);
}

经过一些研究，显然我可以使用Lawnchair.js或解决它另一种方式。但我想知道为什么它在IE8中不起作用。我可以扩展String和Array。为什么不存储？如何找出哪些对象可以扩展以及哪些对象无法在IE8中扩展？

After doing some research, apparently I could use Lawnchair.js or work around it some other way. But I'm wondering why it doesn't work in IE8. I can extend String and Array. Why not Storage? How can I find out which objects I can extend and which ones I can't extend in IE8?

推荐答案

这是 IE 即可。您也无法扩展DOM元素。如果你有时真的需要调用一个函数，你可以通过 Storage.prototype.getObject.call（localStorage，'hello'）来完成。

This is IE. You also can't extend DOM elements. If you sometimes really-really need to call a function, you can do it via Storage.prototype.getObject.call(localStorage, 'hello').

同样扩展内置对象并不是件好事。

Also extending built-in objects is not considered as good thing.

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