调试javascript有什么好的技巧？ [英] What are some good techniques at debugging javascript?

问题描述

所以我经常使用JavaScript，我想知道在调试javascript中是否有任何好的提示或技巧。例如，我有一个很好的，我经常使用。

So I use JavaScript fairly regularly and I was wondering if there were any good tips or tricks in debugging javascript....Like for example I have a good one I use fairly regularly.

在我的代码中，我会做这样的事情

In my code i would do something like this

window.p = $(this);

在控制台中我可以像我这样进行过滤

and in the console I can do my filtering like this

window.p.next("li").find("a").val();

或者我需要做的任何事情，但这样可以轻松地调试代码，我知道有很多提示和技巧在那里....感谢提前

or whatever i need to do...but this makes it easy to debug a specific spot in the code and I know there has got to me many tips and tricks out there....thanks in advance

另外我看着这个问题，虽然它有帮助，我正在寻找更多的技术，像我上面的...

Also i looked at this question and though its helpful i was looking more for techniques like my above ...

推荐答案

我通常设置一个断点并查看范围变量，或添加自己的观察表达式或将鼠标悬停在变量上，然后逐步浏览代码。

I usually set a breakpoint and look at the Scope Variables, or add my own watch expressions or hover over the variables and just step through the code.

有时我发现使用 console.log（） 。

Sometimes I find it useful to just log things using console.log().

其他时候，当事情工作，但是他们太慢我使用code> console.profile（）和 console.profileEnd（）

Other times, when things work, but they are too slow I use console.profile() and console.profileEnd()

一个有用的技巧是使用 $ 0 。如果您在HTML pannel中选择了一个元素，则可以在控制台中将其作为$ 0引用。

A useful trick is the use of $0. If you have an element selected in the HTML pannel, you can reference it in the console as $0.

以上所有技术均适用于Firefox + Firebug和Webkit浏览器如Chrome和Safari）。最近我更喜欢Chrome，因为它允许我直接编辑代码（请参阅 Paul Irish 教程 ）

All techniques above work in Firefox+Firebug and Webkit based browsers (such as Chrome & Safari). Lately I prefer Chrome because it allows me to edit code inline (check this tutorial by Paul Irish)

对于jQuery的额外调试帮助，我使用 FireQuery

For extra debugging help for jQuery I use FireQuery

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