Javascript中alert</script>的方法：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta charset="UTF-8">
<title>b index</title>
<link rel='stylesheet' type="text/css" href='b/css/bootstrap.css'>
<style type="text/css">
.s1{
width: 100px;
height: 100px;
background-color: pink;
}
.s2{
width: 50px;
height: 50px;
background-color: green;
}
</style>
</head>
<body style="margin:1px;">
<div id="div001">div001</div>
<div id='div002'>div002</div>
<div id='div003'>div003</div>
<div>
<button id="btn001">click me to alert script </button>
<button id="btn002">click me to alert script </button>
</div>
<script type="text/javascript" src="js/jquery-1.11.1.js"></script>
<script type="text/javascript" src="b/js/bootstrap.js"></script>
<script type="text/javascript" src="js/index042.js"></script>
<script type="text/javascript">
function btn001Click(e) {
alert('<\/script>');
// 如果写成下面这样，这个页面会出错；Uncaught SyntaxError: Unexpected token ILLEGAL
//alert('</script>');//即便这样写，也是有错误的；除非增加一个空格< / ,或者像上面转义一下；
}
</script>
</body>
</html>
$(function() {
$('#btn001').click(btn001Click);
$('#btn002').click(btn002Click);
});
function btn002Click(e) {
// 在js文件中，可以随意alert；
alert('</script>2');
}