http://blog.csdn.net/dynastyting/article/details/46505349
Visual Studio Tools for Unity installation directory
D:\Program Files (x86) \microsoft Visual Studio 12.0\common7\ide\extensions\microsoft\visual Studio Tools for Unity
C:\Program Files (x86) \microsoft Visual Studio Tools for unity\2013
Here you can find visual Studio tools.unitypackage
Then copy it to the D:\Program files\unity\editor\standard Assets directory
This allows you to import this plugin with Unity3d.
Open Unity, choose New Project, and you'll find a package of visual Studio Tools.unitypackage in the standard package.
You can choose to tick it now, import it, or go to unity and import it.
The way to import in unity is:
Menu bar->assects->importpackage-visual Studio Tools
Select Open in Visual Studio and the project will be opened with vs.
It's easy to debug, F5, then choose to attach to the unity process, then go to unity and run the game.
Then the normal debugging is OK.
"Go" Visual Studio Tools for Unity installation directory, Visual Studio Tools.unitypackage