简单登录界面

1.需要掌握的技术：html php

2.源代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>登陆界面</title>

</head>

<body><?php
if($_POST['ures']=='')
{
echo "<script>alert('用户名不能为空');</script>";
echo "<script language='javascript'>";
echo " location='index1.html ';";
echo "</script>";
}
elseif($_POST['ps']=='')
{
echo "<script>alert('密码不能为空');</script>";
echo "<script language='javascript'>";
echo " location='index1.html ';";
echo "</script>";
}
error_reporting(E_ALL^E_NOTICE^E_WARNING^E_DEPRECATED);
mysql_connect('localhost','root','');
mysql_select_db('mysql');
mysql_query('SET NAMES utf8');
$sql="SELECT password FROM menber2 WHERE user='$_POST[ures]'";
$rs=mysql_query($sql);
$row=mysql_fetch_assoc($rs);
$r=$_POST['ures'];
if($row)
{
if($row['password']==md5($_POST['ps']))
{
echo "<script>alert('登陆成功');</script>";
}
else
{
echo "<script>alert('密码错误');</script>";
echo "<script language='javascript'>";
echo " location='index1.html ';";
echo "</script>";
}
}
else
{
echo "<script>alert('用户名不存在');</script>";
echo "<script language='javascript'>";
echo " location='index1.html ';";
echo "</script>";
}

</body>
</html>

运行结果截图: