jQuery的.isWindow方法? [英] jQuery's .isWindow method?

问题描述

我试图了解我可以从jQuery的动画函数中获得什么，但是最终遇到了我不了解的各种内部函数，最终落入了isWindow. isWindow的代码检查对象是否具有属性setInterval，否则返回false.

I was trying to understand what I could from jQuery's animation functions, but ended up running into all sorts of internal functions I didn't understand, and ultimately landed on isWindow. The code for isWindow checks to see if an object has the property setInterval, and returns false otherwise.

当然，任何对象都可以具有属性setInterval而不是窗口，尽管它几乎是故意企图破坏jQuery的功能以具有具有确切属性名称的对象，但我可以想象一些合理的选择可能是无意的情况.

Of course, any object could have the property setInterval without being the window, and although it would almost have to be a deliberate attempt to sabotage jQuery's functionality to have an object with that exact property name, I can imagine some reasonable cases where it could be unintentional.

是否有更好的方法来检查对象是否为窗口对象?他们不能使用类似

Is there not a better way to check if an object is a window object? Couldn't they use something along the lines of

obj.setInterval && obj.setInterval.toString() == 'function setIternval(){ [native code] }

我知道内部函数的toString返回在所有浏览器中都不是标准的，但是jQuery的作者似乎对这些跨浏览器的差异有很好的理解.我也意识到这也不是一个简单的方法，因为有人可以轻松地覆盖toString方法以返回相同的字符串，但是这仍然可以避免将对象误认为窗口的问题.

I know the return of toString of an internal function isn't going to be standard across all browsers, but the writers of jQuery seem to have a great understanding of these cross-browser differences. I'm also aware that this isn't a fool-proof method either, as someone could easily override the toString method to return that same string, but this would still prevent the problem of having an object mistaken for a window.

我不问我是否认为isWindow仅由jQuery用于内部对象，但是它是isPlainObject的一部分，而isPlainObject在.extend中使用了，可以在外部对象上使用.

I wouldn't ask if I thought that isWindow was only used on internal objects by jQuery, but it was part of isPlainObject, which is used in .extend, which can be used on external objects.

推荐答案

有关:

function isWindow(obj) {
  var toString = Object.prototype.toString.call(obj);
  return toString == '[object global]' || toString == '[object Window]' || toString == '[object DOMWindow]';
}

似乎可以在Chrome，Firefox，Opera，IE和Safari(最新版本)中工作

Seems to work in Chrome, Firefox, Opera, IE and Safari (Newest versions)

这篇关于jQuery的.isWindow方法?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！