javascript ie8 不支持 Object.create
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Object.create not supported in ie8
提问by klye_g
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:
我遇到了一个插件问题，该插件在 jquery 中使用 object.create 创建日期下拉列表。我刚刚在 IE 8 中注意到它抛出了一个错误：
SCRIPT438: Object doesn't support property or method 'create'
Here is the code:
这是代码：
var dropdateobj = Object.create(dropdatefuncs);
dropdateobj.create(options, this);
$.data(this, 'dropdate', dropdateobj);
What is a good work around for IE8 or more cross browser compatible?
对于 IE8 或更多跨浏览器兼容，有什么好的解决方法？
Thanks in advance!
提前致谢！
回答by plalx
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.
如果您需要Object.create，您很有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。
However, if Object.createis 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 nullas the first argument and doesn't support the second propertiesargument.
但是，如果这Object.create是您唯一需要的东西并且您只使用它来纯粹设置原型链，那么这里有一个不支持null作为第一个参数并且不支持第二个properties参数的轻量级 poly-fill 。
Here's the spec:
这是规格：
15.2.3.5 Object.create ( O [, Properties] )
The create function creates a new object with a specified prototype. When the create function is called, the following steps are taken:
If Type(O) is not Object or Null throw a TypeError exception.
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
Set the [[Prototype]] internal property of obj to O.
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.
Return obj.
15.2.3.5 Object.create ( O [, Properties] )
create 函数创建一个具有指定原型的新对象。调用create函数时，采取以下步骤：
如果 Type(O) 不是 Object 或 Null 则抛出 TypeError 异常。
让 obj 成为创建新对象的结果，就像通过表达式 new Object() 其中 Object 是具有该名称的标准内置构造函数
将 obj 的 [[Prototype]] 内部属性设置为 O。
如果参数 Properties 存在且未定义，则将自己的属性添加到 obj，就像通过使用参数 obj 和 Properties 调用标准内置函数 Object.defineProperties 一样。
返回对象。
Here's the lightweight implementation:
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();
};
}
回答by T.J. Crowder
There are several shims that provide this, including this one.
有几种垫片可以提供这一点，包括这个。
Note that Object.createcan'tbe perfectly shimmed, though, because amongst other things it can create non-enumerable properties or properties with getters and setters, which you can't do on all pre-ES5 browsers. (You can do getters and setters on some pre-ES5 browsers using proprietary syntax, but not on IE8 I don't believe.) It can only be pseudo-shimmed.
但是请注意，这不能完美地填充，因为除其他外，它可以创建不可枚举的属性或具有 getter 和 setter 的属性，而这在所有 ES5 之前的浏览器上都无法做到。（您可以使用专有语法在某些 ES5 之前的浏览器上执行 getter 和 setter，但我不相信在 IE8 上不能。）它只能是伪填充。Object.create
But a pseudo-shim will do for the use-case you've quoted.
但是伪垫片可以用于您引用的用例。
Just for completeness, here's a simple version of the part that can be shimmed:
为了完整起见，这里有一个简单版本的可以填充的零件：
if (!Object.create) {
Object.create = function(proto, props) {
if (typeof props !== "undefined") {
throw "The multiple-argument version of Object.create is not provided by this browser and cannot be shimmed.";
}
function ctor() { }
ctor.prototype = proto;
return new ctor();
};
}
回答by Sorter
This will make Object.create() work in IE 8.
这将使 Object.create() 在 IE 8 中工作。
I tried the shim/sham but that didn't work for me.
我尝试了 shim/sham，但这对我不起作用。
if (typeof Object.create !== 'function') {
Object.create = function(o, props) {
function F() {}
F.prototype = o;
if (typeof(props) === "object") {
for (prop in props) {
if (props.hasOwnProperty((prop))) {
F[prop] = props[prop];
}
}
}
return new F();
};
}
