public JsonResult UpdateSingle(int id, string actionName, string actionValue) 
 { 
  var res = new JsonResult(); 
  //var value = "actionValue"; 
  //db.ContextOptions.ProxyCreationEnabled = false; 
  var list = (from a in db.Articles 
   select new 
   { 
    name = a.ArtTitle, 
    yy = a.ArtPublishTime 
   }).Take(5); 
  //记得这里要select new 否则会报错：序列化类型 System.Data.Entity.DynamicProxies XXXXX 的对象时检测到循环引用。 
  //不select new 也行的加上这句 //db.ContextOptions.ProxyCreationEnabled = false; 
  res.Data = list;//返回列表 
 
  var name = "小华"; 
  var age = "12"; 
  var name1 = "小华"; 
  var age1 = "12"; 
  res.Data = new object[] { new { name, age }, new { name1, age1 } };//返回一个自定义的object数组 
 
  var person = new { Name = "小明", Age = 22, Sex = "男" }; 
  res.Data = person;//返回单个对象； 
 
  res.Data = "这是个字符串";//返回一个字符串,意义不大； 
 
  res.JsonRequestBehavior = JsonRequestBehavior.AllowGet;//允许使用GET方式获取，否则用GET获取是会报错。 
  return res; 
 } 

<a href="javascript:void(0);" onclick="javascript:upclick(this);">Click Me</a> 
<script type="text/javascript"> 
 function upclick(o) { 
 var obj = $(o); 
 alert(obj); 
 $.ajax({  
  url: "/Articles/UpdateSingle?ran=" + Math.random(), 
  type: "GET", 
  dataType: "json", 
  data: { id: obj.attr("id"), actionName: obj.attr("actionName"), actionValue: obj.attr("actionValue") }, 
  success: function (data) { 
//  if (data.result == "True") { 
//   alert("修改成功！"); 
//  } 
//  if (obj.attr("actionName") == "ArtVerify") { 
 
//  } 
  $(o).html(data[0].name); 
  obj.attr("actionValue", data[0].result); 
  } 
 }) 
 } 
</script> 

protected void Page_Load(object sender, EventArgs e) 
 { 
  var customer = new customer { name = "李华", sex = "男" }; 
  var customer1 = new customer { name = "小芳", sex = "女" }; 
  var li = new List<customer>(); 
  li.Add(customer); 
  li.Add(customer1); 
  var list = Newtonsoft.Json.JavaScriptConvert.SerializeObject(li); 
  var tt = "[{\"name\":\"李华\",\"sex\":\"男\"},{\"name\":\"小芳\",\"sex\":\"女\"}]"; 
  //new Newtonsoft.Json.JsonSerializer()..(customer); 
  Response.Write(tt); 
  Response.End(); 
 } 
 
 public class customer 
 { 
  public string name { get; set; } 
  public string sex { get; set; } 
 } 

<p> 
 <a href="javascript:void(0)" onclick="javascript:getJsonData();">GetJsonData</a> 
 </p> 
 <div id="dataDiv"> 
 ggg 
 </div> 
 <script type="text/javascript"> 
 function getJsonData() { 
  var str = ""; 
  $.getJSON("/Json.aspx", function (data) { 
  var tt = ""; 
  $.each(data, function (k, v) { 
   $.each(v, function (kk, vv) { 
   tt += kk + "：" + vv + "<br/>"; 
   }); 
  }); 
  $("#dataDiv").html(tt); 
  }); 
 } 
 </script>