html Ajax连接.NET Ashx

Html代码：

<!DOCTYPE html>

<html>

	<head>

		 <meta charset="utf-8">

		  <meta name="viewport" content="width=device-width, initial-scale=1">

		  <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">

		  <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>

		  <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>

		  <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>

		<title>Pick One</title>

	</head>

	<style type="text/css">

		span{

			/*display:inline;*/

			margin:0 auto

		}

		.header

		{

		   background: #ccc;

		   display: flex;

		   justify-content: space-between;

		}

		.nowtime

		{

			font-size:32px;

			font-weight:bold;

		}

		.tname

		{

			font-size:48px;

			color:#9400D3;

		}

		.endtime

		{

			font-size:32px;

			color:#000F7F;

		}

	</style>

	<script>

	           var Retimer=0;

			   var rtimr=0;

				$(document).ready(function() {

					getData();

					window.setInterval(function(){ getTime() },1000);

				})

				/*

				function realSysTime(){

				     	   var now=new Date();

				     	   var year=now.getFullYear();

				     	   var month=now.getMonth();

				     	   var date=now.getDate();

				     	   var day=now.getDay();

				     	   var hour=now.getHours();

				     	   var minu=now.getMinutes();

				     	   var sec=now.getSeconds();

				     	   if(Number(sec)<10){

				     		   sec="0"+sec.toString();

				     	   }

				     	   month=month+1;

				     	   var arr_week=new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");

				     	   var week=arr_week[day];

				     	   var time=year+"年"+month+"月"+date+"日 "+week+" "+hour+":"+minu+":"+sec; //组合系统时间

						   document.getElementById("time").innerHTML=time;

				 }

				 */

				 function getData(){

					 $.ajax({

					     url : "http://localhost:14047/witchone.ashx",//请求地址

					     dataType : "json",//数据格式

					     type : "get",//请求方式

					     async : false,//是否异步请求

					     success : function(data) {   //如何发送成功

					      console.log(data);

					 	 console.log(data["Title"]);

					 	document.getElementById("ttt1").innerHTML=data["Title"];

					 	 var json = eval (data["Data"]);

					 	 console.log(json);

					     for(var i=0;i<json.length;i++){    //遍历data数组

					               var row=table.insertRow(table.rows.length);

					                      var c1=row.insertCell(0);

					                      c1.innerHTML=json[i].ID;

					                      var c2=row.insertCell(1);

					                      c2.innerHTML=json[i].Name;

					                      var c3=row.insertCell(2);

					                      c3.innerHTML=json[i].Age;

					         }

							 Retimer=data["RefreshTime"];

							 rtimr=Retimer;

					     },

					 })

					}

				   function getTime(){

						 document.getElementById("countdown").innerHTML=Retimer;

						 Retimer=Retimer-1;

						if(Retimer==-1)

						{

							getData();

							Retimer= rtimr;

						}

				        var now = new Date();

						var year = now.getFullYear();

						var month = now.getMonth() +1;

						var day = now.getDate();

						var hh = now.getHours();

						var mm = now.getMinutes();

						var ss = now.getSeconds();

						var clock = year + "-";

						if(month < 10)

							clock += "0";

						clock += month + "-";

						if(day < 10)

							clock += "0";

						clock += day + " ";

						if(hh < 10)

							clock += "0";

						clock += hh + ":";

						if (mm < 10) clock += '0';

						clock += mm + ":";

						if (ss < 10) clock += '0';

						clock += ss;

				        document.getElementById("time").innerHTML=clock;

				    }

	</script>

	<body>

		<div class="header">

			<span class="nowtime" id='time'></span>

		    <span class="tname" id='ttt1'></span>

			<span class="endtime">倒计时

				<span class="timecountdown" id='countdown'></span>

			</span>

		</div>

		<div>

			<table id='table' class="table table-bordered">

			    <thead>

			      <tr>

			        <th>ID</th>

					<th>Name</th>

					<th>Age</th>

			      </tr>

			    </thead>

		</div>

	</body>

</html>

　　.net ashx

public class witchone: IHttpHandler

    {

        public void ProcessRequest(HttpContext context)

        {

            Dictionary<string, object> param = new Dictionary<string, object>();

            string ret = "";

            DataTable dt = new DataTable();//创建表

            dt.Columns.Add("ID", typeof(Int32));//添加列

            dt.Columns.Add("Name", typeof(String));

            dt.Columns.Add("Age", typeof(Int32));

            dt.Rows.Add(new object[] { 1, "张三", 20 });//添加行

            dt.Rows.Add(new object[] { 2, "李四", 25 });

            dt.Rows.Add(new object[] { 3, "王五", 30 });

            string data = JsonConvert.SerializeObject(dt, new DataTableConverter());

            param.Add("Title", "Witch One");

            param.Add("RefreshTime", 5);

            param.Add("NowTime", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));

            param.Add("Data", data);

            ret = JsonConvert.SerializeObject(param);

            context.Response.AddHeader("Access-Control-Allow-Origin", "*");

            context.Response.ContentType = "text/html";

            context.Response.Write(ret);

        }

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

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html Ajax连接.NET Ashx

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