namespace MvcAjaxAdd.Models {  public class ClickCountModel  {   [Key]   [DatabaseGeneratedAttribute(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)]   public int ID { get; set; }    public string URL { get; set; }    public int? Num { get; set; }  } } 

@{  ViewBag.Title = "Index"; } @model MvcAjaxAdd.Models.ClickCountModel <script src="~/Scripts/jquery-1.7.1.js" type="text/javascript"></script> <script type="text/javascript">  $(function () {   var obj = {    "num": $("#lblnum").text(),    "url": window.location.pathname//獲取/Home/Index   };   $("#addnum").click(function () {    $.ajax({     type: 'POST',     url: '/Home/ClickGood',     data: obj,     success: function (data) {      $("#lblnum").text(data.Num);      //其它操作，比如每個登錄用戶只能點一次，按鈕禁用等     }    });   });  }); </script> <div id="addnum" style="width: 70px; height: 70px; background-color: #FF9900">  <div align="center" style="margin-top: 10px;">   <label style="color: White; font-size: 20pt;">    頂</label></div>  <div align="center">   <label id="lblnum" style="color: White; font-size: 10pt;">    @Model.Num</label></div> </div> 

namespace MvcAjaxAdd.Controllers {  public class HomeController : Controller  {   private ClickCountContext db = new ClickCountContext();    public ActionResult Index()   {    ClickCountModel ClickCountModel = db.ClickCountModels.FirstOrDefault(x => x.URL == "/");    return View(ClickCountModel);   }    [HttpPost]   public JsonResult ClickGood(ClickCountModel ClickCountModel)   {    ClickCountModel newClickCountModel = db.ClickCountModels.FirstOrDefault(x => x.URL == ClickCountModel.URL);    newClickCountModel.Num++;//數量+1    db.SaveChanges();    return Json(newClickCountModel);   }  } }