javascript学习(十七):js通过XMLHTTPrequest实现Ajax

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html>   <head>     <base href="<%=basePath%>">          <title>My JSP 'ajax.jsp' starting page</title>      	<meta http-equiv="pragma" content="no-cache"> 	<meta http-equiv="cache-control" content="no-cache"> 	<meta http-equiv="expires" content="0">     	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 	<meta http-equiv="description" content="This is my page"> 	<!-- 	<link rel="stylesheet" type="text/css" href="styles.css"> 	--> 	 	<script type="text/javascript"> 	 	var xmlHttpRequest = null; //声明一个空对象以接收XMLHttpRequest对象 	 	function ajaxSubmit() 	{ 		if(window.ActiveXObject) // IE浏览器 		{ 			xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP"); 		} 		else if(window.XMLHttpRequest) //除IE外的其他浏览器实现 		{ 			xmlHttpRequest = new XMLHttpRequest(); 		} 		 		if(null != xmlHttpRequest) 		{ 			var v1 = document.getElementById("value1ID").value; 			var v2 = document.getElementById("value2ID").value; 			 			xmlHttpRequest.open("POST", "AjaxServlet", true); 			//关联好ajax的回调函数 			xmlHttpRequest.onreadystatechange = ajaxCallback; 			 			//真正向服务器端发送数据 			// 使用post方式提交,必须要加上如下一行 			xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); 			xmlHttpRequest.send("v1=" + v1 + "&v2=" + v2); 		} 	} 	 	function ajaxCallback() 	{ 		if(xmlHttpRequest.readyState == 4) 		{ 			if(xmlHttpRequest.status == 200) 			{ 				var responseText = xmlHttpRequest.responseText; 				 				document.getElementById("div1").innerHTML = responseText; 			} 		} 	} 	</script>   </head>      <body>          <input type="button" value="get content from server"      <input type="text" name="value1" id="value1ID"><br>     <input type="text" name="value2" id="value2ID"><br>          <div id="div1"></div>        </body> </html> 

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