Json implements asynchronous request to submit comments without jumping to other pages_jquery

Mainly paste the code and understand the relevant logic by reading the code.

html code:

<form id="form1" runat="server"> 
<p> 
评论：</p> 
<p> 
姓名：<input type="text" name="username" id="username1" /></p> 
<p> 
内容：<textarea name="content" id="content" rows="2" cols="20"></textarea></p> 
<p> 
<input type="button" id="send" value="提交" /></p> 
</form> 
<div class="comment"> 
已有评论：</div> 
<div id="resText"> 
</div>

js code:

$("#send").click(function () { 
$.get("doSave.ashx", {<span style="white-space:pre"> </span> <span style="font-family: Arial, Helvetica, sans-serif;"> </span>//调用json插件 
u_name: $("#username1").val(), //json数据/值对化 
u_cont: $("#content").val() 
}, function (data) 
var uName = data.username; //注：此处的username与doSave.ashx中的dic.add("username",uname)中的username相对应的 
var uCont = data.content; 
var txtHtml = "<div class='comment'><h6>" 
+ uName + ":</h6><p class='para'>" 
+ uCont + "</p></div>" 
$("#resText").html(txtHtml); //将返回的数据添加到页面上 
}, "json"); 
})

Plug-in code:

<%@ WebHandler Language="C#" Class="doSave" %> 

using System; 
using System.Web; 

public class doSave : IHttpHandler 
{ 

public void ProcessRequest(HttpContext context) 
{ 

var dic = new System.Collections.Generic.Dictionary<string, object>(); //存储的集合 
string jsonStr = "{}"; //新建字符串jsonStr 

context.Response.ContentType = "text/json"; //定义返回的内容类型为json 

string uname = context.Request.QueryString[0]; //获取请求参数中第一个参数，也可以直接使用uname 

string commet = context.Request.QueryString[1]; //定义字符串uname、commet为context请求查询的字符串context.Request.Params["username"];QyertStrubg:查询字符串 

dic.Add("username", uname); //将字符串添加到对象中 

dic.Add("content", commet); 

jsonStr = Newtonsoft.Json.JsonConvert.SerializeObject(dic); //序列化集合为json字符串 

context.Response.Write(jsonStr); 
} 

public bool IsReusable 
{ 
get 
{ 
return false; 
} 
} 

}

The effect here is, enter the relevant text in the input box, click Submit, and the written text will be automatically displayed below without jumping to other pages.