I was searching the web today how I could enable SharePoint intellisense for JavaScript.

I found the following solution.

 

The Solution:

 

Step 1: Add the following reference => System.Web.Extensions

 

step 2: Create a new JavaScript file and name it: “theBom.js”

 

 

step 3: Add the following javascript reference

 

 

The reference we use in JavaScript is like a using in C#.

 

step 4: For the last step we need do press the following keys => ctrl + shift + j . This will update the intellisense  for the JavaScript.

 

 

Soruce: http://davemcmahon81.wordpress.com/2010/12/28/getting-sharepoint-2010-javascript-intellisense-to-work-in-vs2010/