Assuming you’re talking about Visual Studio, try adding the following line to the top of your .js file.
/// <reference path="~/path/to/your/jquery.js"/>
Also, if you’re using anything other than the version of jQuery that was packaged with Visual Studio, you’ll need a jquery-x.x.x-vsdoc.js file that matches your jquery filename, and put that vsdoc in the same directory as your jQuery library.
(For example, if you are using jquery-1.5.2.min.js, you will want jquery-1.5.2-vsdoc.js in the same directory of your project)
You can get the applicable vsdoc file at this page:
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solved Intellisense while editing JS files