1.继续完成php大作业
<?php
if(!empty($_GET)) {
if(isset($_GET["message"]))
{
$message = $_GET["message"];
echo "<script>alert('$message');</script>";
}
}
if (!session_id()) session_start();
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<title></title>
<style type="text/css">
#nav{height:40px; background-color:lightblue;}
#nav *{margin:0;padding:0;}
#nav a{text-decoration:none;}
/*一级菜单*/
#nav ul{margin:0 auto; 800px; display:block;list-style-type:none;}
#nav ul li{display:block;150px;height:40px; line-height:40px; float:left;text-align:center;border-right:solid 1px white;}
#nav ul li{border:solid 1px white ;}
#nav ul li ul li:last-child{border-right:none;border-bottom: none;}
#nav ul li:hover{background-color:pink;}
/*二级菜单*/
#nav ul li ul{display:none;}
#nav ul li ul li{150px; height:40px; line-height:40px;background-color:lightblue/*rgba(95, 181, 43, 0.50)*/;border-bottom:solid 1px #808080;}
#nav ul li:hover ul{display:block;position:relative;150px;}
#nav ul li ul li:hover{background-color:pink;}
/*三级菜单*/
#nav ul li:hover ul li ul{display:none;}
#nav ul li:hover ul li:hover ul{display:block; position: relative; left: 150px; top: -40px;}
#nav ul li:hover ul li:hover ul li{150px; height:40px; line-height: 40px;}
#nav ul li:hover ul li:hover ul li:hover{background-color:pink;}
* {
margin: 0;
padding: 0;
}
a:link {color: gray;} /* 未访问的链接 */
a:visited {color: gray} /* 已访问的链接 */
a:hover {color: gray} /* 当有鼠标悬停在链接上 */
a:active {color: gray} /* 被选择的链接 */
a{
text-decoration : none;
font-size: 15