how to implement regions/code collapse in javascript

Question

How can you implement regions a.k.a. code collapse for JavaScript in Visual Studio?

If there are hundreds of lines in javascript, it\'ll be more understandable using

Answer 1

For those about to use the visual studio 2012, exists the Web Essentials 2012

For those about to use the visual studio 2015, exists the Web Essentials 2015.3

The usage is exactly like @prasad asked