There are several javascript debugger plugins for Eclipse, but I don’t think that in general is what people use.
Typically (since javascript is running in the browser, and each browser behaves differently), you run and debug in the browser.
To debug javascript, I use:
- Firefox: Firebug
- IE8: Embedded Developer Tools (F12)
- Safari: ( prefs, JS-)
- Google Chrome: webkit JS Safari.
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