ie8中不支持Object.create [英] Object.create not supported in ie8

问题描述

我遇到了一个插件的问题，该插件在jquery中使用object.create来创建日期下拉列表。我刚刚在IE 8中注意到它抛出的错误是：

I came across an issue with a plugin that uses object.create in jquery to create a date dropdown. I just noticed in IE 8 that it is throwing an error of:

SCRIPT438: Object doesn't support property or method 'create'

以下是代码：

var dropdateobj = Object.create(dropdatefuncs);
dropdateobj.create(options, this);
$.data(this, 'dropdate', dropdateobj);

IE8或更多跨浏览器兼容有什么好处？

What is a good work around for IE8 or more cross browser compatible?

提前致谢！

推荐答案

如果你需要 Object.create ，您可能还需要依赖其他es5功能。因此，在大多数情况下，适当的解决方案是使用 es5-shim 。

If you need Object.create, there are good chances you may need to rely on other es5 features as well. Therefore, in most cases the appropriate solution would be to use es5-shim.

但是，如果 Object.create 是你唯一需要的东西而你只用它来纯粹设置原型链，这里是一个轻量级的poly-fill，不支持 null 作为第一个参数，不支持第二个属性参数。

However, if Object.create is the only thing you need and you only use it to purely setup the prototype chain, here's a lightweight poly-fill that doesn't support null as the first argument and doesn't support the second properties argument.

这是规格：

15.2 .3.5 Object.create（O [，Properties]）

15.2.3.5 Object.create ( O [, Properties] )

create函数使用指定的原型创建一个新对象。
调用create函数时，将执行以下步骤：

The create function creates a new object with a specified prototype. When the create function is called, the following steps are taken:

如果Type（O）不是Object或Null则抛出TypeError异常。

If Type(O) is not Object or Null throw a TypeError exception.

设obj是创建一个新对象的结果，好像通过表达式
new Object（）其中Object是标准的内置构造函数，
name

Let obj be the result of creating a new object as if by the expression new Object() where Object is the standard built-in constructor with that name

将obj的[[Prototype]]内部属性设置为O。

Set the [[Prototype]] internal property of obj to O.

如果参数属性为现在而不是未定义，将自己的
属性添加到obj，就好像通过调用带有参数obj和Properties的标准内置函数
Object.defineProperties一样。

If the argument Properties is present and not undefined, add own properties to obj as if by calling the standard built-in function Object.defineProperties with arguments obj and Properties.

返回obj。

这是轻量级实现：

if (!Object.create) {
    Object.create = function(o, properties) {
        if (typeof o !== 'object' && typeof o !== 'function') throw new TypeError('Object prototype may only be an Object: ' + o);
        else if (o === null) throw new Error("This browser's implementation of Object.create is a shim and doesn't support 'null' as the first argument.");

        if (typeof properties != 'undefined') throw new Error("This browser's implementation of Object.create is a shim and doesn't support a second argument.");

        function F() {}

        F.prototype = o;

        return new F();
    };
}

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