这是一个例子。控制器方法示例

[HttpPost] // can be HttpGet
public ActionResult Test(string id)
{
     bool isValid = yourcheckmethod(); //.. check
     var obj = new {
          valid = isValid
     };
     return Json(obj);
}

这将是您的javascript函数。

function checkValidId(checkId)
{
    $.ajax({
         url: 'controllerName/Test',
         type: 'POST',
         contentType: 'application/json;',
         data: JSON.stringify({ id: checkId }),
         success: function (valid)
         {
              if(valid) { 
                  //show that id is valid 
              } else { 
                  //show that id is not valid 
              }
         }
    });
}