时间：2021-07-01 10:21:17 帮助过：11人阅读
注：通过Ajax向后台请求数据
2、然后是后台操作
<?php
header("Content-Type:text/html;charset=utf-8");
include_once("mysqlshujuku.php");
$userName = $_POST["userName"];
$pwd = $_POST["pwd"];
$realName = $_POST["realName"];
$searchUserSql = <<<searchUserSql
select * from user where username = "{$userName}"
searchUserSql;
$res = mysqli_query($conn, $searchUserSql);
if($row = mysqli_fetch_row($res)){
die("用户名已注册");
}
$insertUserSql = <<<insertUserSql
insert into yzdl (username,pwd,realname)
values ("{$userName}","{$pwd}","{$realName}");
insertUserSql;
$isOk = mysqli_query($conn,$insertUserSql);
if($isOk){
echo "注册成功";
}else{
echo "注册失败";
}
mysqli_free_result($res);
mysqli_close($conn);
注：这里我们对MySQL数据库中的数据进行了对比，已注册的用户无法注册
3、下面我们再做一个简单的前台登录页面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户登录——杰瑞教育图书管理系统</title>
<link rel="stylesheet" type="text/css" href="../../libs/bootstrap.css"/>
<style type="text/css">
body{
margin: 0px;
padding: 0px;
background-color: #CCCCCC;
}
.panel{
width: 380px;
height: 280px;
position: absolute;
left: 50%;
margin-left: -190px;
top: 50%;
margin-top: -140px;
}
.form-horizontal{
padding: 10px 20px;
}
.btns{
display: flex;
justify-content: center;
}
</style>
</head>
<body>
<div class="panel panel-primary">
<div class="panel-heading">
<div class="panel-title">用户登录</div>
</div>
<div class="panel-body">
<form class="form-horizontal">
<div class="form-group">
<label>用户名</label>
<input type="text" class="form-control" name="userName"/>
</div>
<div class="form-group">
<label>密码</label>
<input type="password" class="form-control" name="pwd"/>
</div>
<div class="form-group btns">
<input type="button" class="btn btn-primary" value="登录系统" id="submit"/>
<a type="button" class="btn btn-success" href="reg.php"/>注册账号</a>
</div>
</form>
</div>
</div>
</body>
<script src="../../libs/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
$("#submit").on("click",function(){
var userName = $("input[name=‘userName‘]").val();
var pwd = $("input[name=‘pwd‘]").val();
$.post("doLogin.php",{
"userName":userName,
"pwd":pwd
},function(data){
alert(data);
if(data=="登录成功"){
location = "index.php";
}else{
alert("用户名或密码有误！");
}
});
});
});
</script>
</html>
注：也是通过的Ajax，这里我们登录成功后直接进入主页
4、登录页的后台
<?php header("Content-Type:text/html;charset=utf-8"); @session_start(); include_once("mysqlshujuku.php"); $userName = $_POST["userName"]; $pwd = $_POST["pwd"]; $loginSql = <<<login select * from yzdl where username="{$userName}" and pwd = "{$pwd}"; login; $res = mysqli_query($conn, $loginSql); if($row = mysqli_fetch_row($res)){ $_SESSION["user"] = $row; echo "登录成功"; }else{ echo "登录失败"; } mysqli_free_result($res); mysqli_close($conn);<?php header("Content-Type:text/html;charset=utf-8"); @session_start(); include_once("mysqlshujuku.php"); $userName = $_POST["userName"]; $pwd = $_POST["pwd"]; $loginSql = <<<login select * from yzdl where username="{$userName}" and pwd = "{$pwd}"; login; $res = mysqli_query($conn, $loginSql); if($row = mysqli_fetch_row($res)){ $_SESSION["user"] = $row; echo "登录成功"; }else{ echo "登录失败"; } mysqli_free_result($res); mysqli_close($conn);
5、最后是主页，主页的具体内容可以自己补充
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>我是主页</h1>
<?php
session_start();
if(isset($_SESSION["user"])){
echo "欢迎您，{$_SESSION[‘user‘][3]}";
}else{
$str = <<<js
<script>
alert("请登陆后操作！");
location = "login.php";
</script>
js;
echo $str;
}
?>
<a href="doLogout.php">退出系统</a>
</body>
</html>
这样一个简单的前后台交互登录注册系统就完成了，如有问题请留言。
MySQL前后台交互登录系统设计
标签：insert class 教育 用户登录 失败 注册系统 注册账号 对比 position