VS 2010 非常不錯的 JS 和 CSS 伸縮插件!

This extension provides outlining and matching braces highlighting features for Visual Studio JavaScript and CSS editor.

Works both in JS/CSS files and HTML script/style blocks.

Outlining is like in C# editor. It outlines {}s, []s and #region tags.

There's also an options page in Tools -> Options menu where you can specify what will be collapsed by default when you open a file.