Detailed explanation of AJAX XMLHttpRequest object

This article mainly introduces the AJAX XMLHttpRequest object in detail, which has certain reference value. Interested friends can refer to it

AJAX is a web development technology for creating interactive web applications. , is a collection of asynchronous Javascript and XML. Its core is the XMLHttpRequest object, which can partially update web pages without submitting the entire page to the server. It is a key technology in the AJAX Web application architecture.
Basic attributes:

Basic method:

First: Create an XMLHttpRequest object
Second: Register the callback function
Third: Set the parameters for interaction with the server
Fourth: Set the data sent to the server and start the interaction with the server
Fifth: Judgment Whether the interaction with the server is completed, and whether the server returns correct data
HTML code:

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace XMLHttpRequest五步法 { public partial class XMLHttpRequest : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //Response.Clear(); //获取当前值，get提交使用Request.QueryString方法 //string username = Request.QueryString["username"]; //POST提交，使用Request.Form string username = Request.Form["username"]; Response.Write("姓名：'" + username + "'
时间：'" + DateTime.Now.ToString() + "'"); Response.End(); } } }

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