I use Netbeans, it has really good JavaScript support, all the standard stuff you would expect, plus it reconizes most of the JS libraries and will do auto complete for them. They used to have in IDE Javascript debugging in 6.7 but 6.9 and 7 do not have the plugin, they say it is coming back at some point. It was really nice to set break points in the IDE run the browser and be able to step through the code in the IDE. You could step through the front end, to the back end, to the database, and back again.
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I use Netbeans, it has really good JavaScript support, all the standard stuff you would expect, plus it reconizes most of the JS libraries and will do auto complete for them. They used to have in IDE Javascript debugging in 6.7 but 6.9 and 7 do not have the plugin, they say it is coming back at some point. It was really nice to set break points in the IDE run the browser and be able to step through the code in the IDE. You could step through the front end, to the back end, to the database, and back again.