How to write JavaScript in Eclipse

I am using eclipse for java coding. Can I use JavaScript in eclipse? If yes, How to use it? Please give ideas.

Can you code JavaScript on Eclipse?

The JavaScript Development Tools (JSDT) provide plug-ins that implement an IDE supporting the development of JavaScript applications and JavaScript within web applications. It adds a JavaScript project type and perspective to the Eclipse Workbench as well as a number of views, editors, wizards, and builders.

Why JavaScript is not working in Eclipse?

It's possible that you are developing in a different perspective that does not have this association preset. It should be noted, if it was already opened in normal eclipse editor, you need to close and reopen file for that to take effect. (The JS editor as default should be set automatically.)

I use the excellent Aptana studio eclipse plugin.