abstract：<?php if(isset($_POST["submit"]) && $_POST["submit"] == "登陆") { &n
<?php
if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")
{
$user = $_POST["username"];
$psw = $_POST["password"];
if($user == "" || $psw == "")
{
echo "<script>alert('请输入用户名或密码！'); history.go(-1);</script>";
}
else
{
mysql_connect("localhost","root","sixx");
mysql_select_db("vt");
mysql_query("set names 'gbk'");
$sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'";
$result = mysql_query($sql);
$num = mysql_num_rows($result);
if($num)
{
$row = mysql_fetch_array($result); //将数据以索引方式储存在数组中
echo $row[0];
}
else
{
echo "<script>alert('用户名或密码不正确！');history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert('提交未成功！'); history.go(-1);</script>";
}
?>
Correcting teacher：天蓬老师Correction time：2019-04-08 09:52:32
Teacher's summary：登录处理, 如果后面不需要执行,应该加一条exit()这样好些, 以防止在页面中输出一些无关的内容
