Easily learn JS debugging (no tool is downloaded)

However, I still have some experience in JS debugging:
First, when we write a piece of JS Code:
1. Click IE browser-toolbar-click developer tools or press F12

Our debugging Interface
Click the leftmost part to set a breakpoint like VS2005.

Click Debug:

You can go back to the page to run or refresh the page for debugging.

In fact, all Microsoft products are inevitably the same as VS, so it is easy to learn.

As with VS, VS can also debug JS.

Firefox is also about to choose the wrong Console (CTRL + SHIFT + J). You can directly enter JS for testing.
It is easier to use firefox + firebug. The relevant tutorials are as follows.

Firefox firebug Chinese getting started tutorial script home New Year Special Edition
Firefox Plugin Firebug tutorial