mvc view the return value

MVC View various return type as follows:

       Index ContentResult public () 
        { 
            return Content ( "test"); // browser displays the test 
        } 

        public EmptyResult Index () 
        { 
            return new new EmptyResult (); // browser displays a blank             
        } 

        public FileResult Index () 
        { 
            return File (Server .MapPath ( "~ / demo.jpg") , "application / x-jpg", "demo.jpg"); // browser Download demo.jpg    
        } 

        public HttpNotFoundResult Index () 
        { 
            return HttpNotFound (); // error messages 404           
        } 

        public HttpUnauthorizedResult Index () 
        {
            return new HttpUnauthorizedResult (); // unauthorized page, jump to / the Account / LogOn           
        } 

        public JavaScriptResult the Hello () 
        { 
            String JS = "Alert ( 'Are you all right?');"; 
            return JavaScript (JS); // display the page alert ( 'you okay?');} does not perform this js, js can be executed in any view this was <script src = "@ Url.Action ( " hello ")" type = " text / JavaScript "> </ Script>      
        } 

        public a JsonResult Index () 
        { 
            var jsonObj new new = 
            { 
                Id =. 1, 
                the Name =" Xiaoming ", 
                Sex =" M ", 
                Like =" soccer " 
            };

            return Json (jsonObj, JsonRequestBehavior.AllowGet); // return a JSON, this code may be output to the display processing JS 
        } 

        public RedirectResult Index () 
        { 
            return the Redirect ( "~ / demo.jpg"); // can jump to any path 
            return the Redirect ( "http://www.baidu.com"); 
            return the Redirect ( "/ List"); 
        } 

        public RedirectToRouteResult Index () 
        { 
            return RedirectToRoute (// Jump to the Action 
            new new 
            { 
                Controller = " Home ", 
                Action =" GetName " 
            }); 
        } 

        public a ViewResult Index ()
        {
            return View (); // this is the most common, the view returns specified 
            // return View ( "List"); 
            // return View ( "/ the User / List"); 
        } 

        public PartialViewResult Index () 
        { 
            return PartialView () ; // partial view, can be incorporated as a part of a further view, with substantially the same view 
        }