javascript IE 中的无效调用对象错误
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Invalid Calling Object error in IE
提问by Jaboc83
So I'm getting the error 'Invalid Calling Object' in IE11 when trying to execute the following:
因此，当我尝试执行以下操作时，在 IE11 中收到错误“无效的调用对象”：
window.toString.call({});
When I expect to see => "[object Object]"
当我希望看到 => "[object Object]"
This form seems to works though:
不过，这种形式似乎有效：
({}).toString();
Both forms appear to work fine in chrome, am I missing something?
这两种形式在 chrome 中似乎都可以正常工作，我错过了什么吗？
回答by Paul S.
You seem to be neglecting the fact
你似乎忽略了这个事实
window.toString === Object.prototype.toString; // false
The Window'stoStringis implementation-specific and there is nothing in the specification saying methods on DOM Host Objectshave to work with call/on other objects/etc
该窗口的toString是实现特定的，没有什么规范话说方法DOM主机对象都将工作与call/其他物体上的/ etc
If you want to capture this toStringbut can't assume prototype, try
如果你想捕捉这个toString但不能假设原型，试试
var toString = ({}).toString;
toString.call({}); // "[object Object]"
You could also consider skipping calleach time by wrapping it or using bind
您也可以考虑call通过包装或使用每次跳过bind
var toString = function (x) { return ({}).toString.call(x); };
toString(10); // "[object Number]"
// or
var toString = ({}).toString.call.bind(({}).toString);
toString(true); // "[object Boolean]"
