如何找到在运行时定义变量的位置? [英] How do I find where a variable is defined at runtime?

问题描述

直到最近，我一直并排使用jQuery和YUI.有时，在回调(例如，YUI按钮)内部，$将被其他一些功能遮盖(单击以获取大版本):

I've been using jQuery and YUI side-by-side with no issues until recently. Occasionally, inside of a callback for, say, a YUI button, $ will be shadowed by some other function (click for big version):

在我的生命中，我不知道为什么会发生这种情况.是的，我知道我很安全，可以在任何地方使用jQuery或window.$而不是仅仅使用$，但这只是一种解决方法，而不是实际的解决方法.

and for the life of me, I cannot figure out why this is happening. Yes, I know I could be safe and use jQuery or window.$ everywhere instead of just $, but that's just a workaround and not an actual fix.

在运行时，如何找到这个$冒名顶替者来自何处? -例如找到它的声明位置，以及为什么它在我的流血范围内.

At runtime, how can I find where this $ impostor is coming from? - e.g. find where it's declared, and why it's in my bleedin' scope.

事实证明，此行为很容易在Stack Overflow上重现(至少在Chrome和Firefox 4中如此)，因为SO使用jQuery(再次单击以查看完整大小):

It turns out that this behavior is easily reproduced (at least in Chrome and Firefox 4) right here on Stack Overflow, since SO uses jQuery (again, click for full size):

我只能将$推断为

function () {
    return document.getElementById.apply(document, arguments)
}

必须来自控制台本身！

with再次触击.

此问题的铬错误: http://code.google. com/p/chromium/issues/detail?id = 70969

推荐答案

我敢保证IE中不会发生这种情况?这是我唯一能找到的提示:

I'm betting this doesn't happen in IE? This is the only hint I could find:

http://davidwalsh.name/dollar-functions

http://dam5s.tumblr.com/post/3079779011/bug-in-chromes-javascript-console

Chrome/Firefox/Safari中的某种错误.

Some sort of bug in Chrome/Firefox/Safari.

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