JS function return functionname; or return functionname (); __ Data structure

Today, our project team to the backend data management of the front-end part of the code refactoring, requiring the modular reconfiguration with Requirejs, due to just contact with special dishes, encountered a lot of problems, so I can not stand the question of the title.

Situation One:

Function name () {
    //Omit return
    name ();//true return
    name;//console always prompts undefined
}

Situation Two:

name = function () {
    //Omit return
    name ();//console always prompts undefined return
    name;//true
}

It makes me stuffy ...