PHP语言 -- Ajax 登录处理

//删除确定按钮
<a href="delete.php" onclick="return confirm('确定删除？');">删除</a>

<h1>登录</h1>
<div>用户名：<input type="text" id="uid" /></div>
<div>密码：<input type="text" id="pwd" /></div>
<div><input type="button" value="登录" id="btn"></div>
</body>

<script type="text/javascript">
$(document).ready(function(e){

$("#btn").click(function{

var uid = $("#uid").val();

var pwd = $("#pwd").val();

$.ajax({
url:"chuli.php", //处理页面的路径
data:{u:uid,p:pwd}, //传递的数据
type:"POST",    //数据的提交传递方式
datatype:"TEXT", //返回值的类型，TEXT JSON XML三种类型可选
success:function(data){

if(data=="OK")
{
window.location = "Main.php"; //跳转到主页面
}
else
{
alert(data);
}

});

})

});

</script>

<?php  //不要有空 顶到头写

$uid = $_POST["u"]; //接收
$pwd = $_POST["p"];

include "DBDA.php";

$db = new DBDA();

$sql = "select count(*) from login where username='{$uid}' and password='{$pwd}'";

$attr = $db->Query($sql);

if($attr[0][0]==0)
{
echo "用户名密码不正确";
}
else
{
echo "OK";
}