代码如下：<%@ 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>Ext JS</title>
<link rel="sytlesheet" type="text/css" href="extjs/resources/css/ext-all.css">
<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>
<script type="text/javascript">
Ext.onReady(function(){
Ext.MessageBox.alert("信息提示", "您输入的合同编号有误,请重新输入!");
});
</script>
</head>
<body>
</body>
</html>ext所需要的js，css文件都已导入。
<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>