标签：不刷新 使用 nta htm super sof amp alt com
Asynchronous JavaScript And XML(异步的JavaScript和XML)；
Ajax可以在不刷新页面的前提下，进行页面局部更新；
Ajax不是新的技术，Ajax并不是W3C的标准；
| readyState值 | 说明 |
|---|---|
| readyState = 0 | 请求未初始化 |
| readyState = 1 | 服务器连接已建立 |
| readyState = 2 | 请求已被接收 |
| readyState = 3 | 请求正在处理 |
| readyState = 4 | 响应文本已被接收 |
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<input id="btnLoad" type="button" value="加载">
<div id="divContent"></div>
<script>
document.getElementById("btnLoad").onclick = function(){
//1.创建XmlHttpRequest对象
var xmlhttp;
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest(); //新版本浏览器
}else{
xmlhttp = new ActiveXobject("Microsoft.XMLHTTP"); //老版本浏览器
}
//2.发送Ajax请求
xmlhttp.open("GET", "/ajax/content", true);//创建请求，true为异步执行
xmlhttp.send(); //发送请求
console.log(xmlhttp);
//3.处理服务器响应
xmlhttp.onreadystatechange = function(){
//响应已被接收并且服务器处理成功
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
var responseText = xmlhttp.responseText;
document.getElementById("divContent").innerHTML = responseText;
}
}
}
</script>
</body>
</html>ContentServlet.java
package demo;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class ContentServlet
*/
@WebServlet("/content")
public class ContentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ContentServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().println("<b>I'm server content</b>");
}
}
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标签：不刷新 使用 nta htm super sof amp alt com
原文地址：https://www.cnblogs.com/huowuyan/p/11295141.html
