php登陆小问题
login.php
<script type="text/javascript"> function check() { var un = document.getElementById("username").value; var up = document.getElementById("userpass").value; if(un==""){alert("null"); return false;} if(up==""){alert("null");return false;} }</script><body><form method="post" action="show.php" name="form1" onsubmit="return check()">用户名：<input type="text" name="username" id="username" /><br />密 码：<input type="password" name="userpass" id="userpass" /><br /><input type="submit" name="submit" value="登陆" /></form></body><?php include("conn.php"); ?><?php if($_POST["submit"]) { echo $sql ="select * from users where username='".$_POST["username"]."' and userpass='".$_POST["userpass"]."'"; $result=mysql_query($sql); //echo count($result); if($result) { echo "登陆成功"; }else { echo "不要捣乱"; } }?>