//jsp文件<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script type="text/javascript">var xmlHttp;function createXMLHttp(){xmlHttp=new XMLHttpRequest(); }function showMsg(){createXMLHttp();xmlHttp.open("POST","NewFile.jsp");xmlHttp.onreadystatechange=showMsgCallback;xmlHttp.send(null);}function showMsgCallback(){if(xmlHttp.readyState==4){if(xmlHttp.status==200){var text=xmlHttp.responseText;document.getElementById("msg").className="样式表名称";document.getElementById("msg").innerHTML=text;}}}
</script>
</head>
<body>
<input type="button" οnclick="showMsg()" value="调用Ajax" >
<span id="msg"></span></body>
</html>调用的jsp文件名：NewFile.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
hello Ajax!
</body>
</html>
 元信息未删除导致 There is an overlap in the region chain.)
