Halaman log masuk pengguna (js melaksanakan permintaan ajax dalam mod dapatkan)
login.html kod adalah seperti berikut:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<hr size="1">
用户：<input type="text" id="username" name="username"/><br>
密码：<input type="password" id="password" name="password" /><br>
<div id="error_message" style="color: red"></div>
<input type="submit" id='login' name='login' value="登录">
<div id="success"></div>
</body>
<script type="text/javascript">
document.getElementById("login").onclick = function () {
var name = document.getElementById("username").value;
var pwd = document.getElementById("password").value;
var oError = document.getElementById("error_message");
var isNotError = true;
if(name==""){
oError.innerHTML = "警告:用户名为空 ";
isNotError = false;
return;
}else if(pwd==""){
oError.innerHTML = "警告:密码为空 ";
isNotError = false;
return;
}
//创建XHR对象
var xhr = new XMLHttpRequest();
//设置请求URL
var url = "./success.php?username=" + name+"&password="+pwd;
//设置XHR对象readyState变化时响应函数
xhr.onreadystatechange = function () {
var success = document.getElementById("success");
//readyState是请求的状态，为4表示请求结束
if (xhr.readyState == 4) {
//responseText服务器响应的内容
var data = eval(this.responseText);
for(var index in data) {
if(data[index].code==1){
alert(data[index].message);//密码错误
}else if(data[index].code==2){
alert(data[index].message);//您已经登入了
success.innerHTML = "用户名："+data[index].session+"---"+"<a href='logout.php'>注销</a>";;
}else if(data[index].code==3){
alert(data[index].message);//登录成功
success.innerHTML = "您好！"+data[index].session+",欢迎回来！<a href='logout.php'>注销</a>";
}
else if(data[index].code==4){
alert(data[index].message);//没有此用户,请重新登录
location.href='login.html';
}
}
}
};
//打开链接
xhr.open("get", url, true);
//发送请求
xhr.send();
}
</script>
</html>Alamat url yang diserahkan oleh ajax ialah success.php, dan sambungan pangkalan data berjaya dibuat .php. Proses data, kemudian kembalikan ke halaman log masuk dalam format json untuk memaparkannya, dan cetak dan lihat melalui makluman
success.php kod adalah seperti berikut:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/2/27 0027
* Time: 上午 10:47
*/
header('Content-type:text/html;charset=utf-8');
if ($_SERVER['REQUEST_METHOD'] == 'GET') {
$username=trim($_GET['username']);
$password=$_GET['password'];
}
$mysqli = new mysqli('localhost', 'root', 'root', 'student');
$result = $mysqli->query("SELECT password FROM user WHERE username = "."'$username'");
$rs=$result->fetch_row();
if (!empty($rs)){
if ($password != $rs[0]) {
$data = array(
array('code' => 1, 'message' => '密码错误,请重新登录'),
);
echo json_encode($data);
}else{
$expire=3600;
ini_set('session.gc_maxlifetime', $expire);//保存1小时
if (empty($_COOKIE['PHPSESSID'])) {
session_set_cookie_params($expire);
session_start();
}else{
session_start();
setcookie('PHPSESSID', session_id(), time() + $expire);
}
if(isset($_SESSION['username'])){
$data = array(
array('code' => 2, 'message' => '您已经登入了，请不要重新登入','session'=>$_SESSION['username']),
);
echo json_encode($data);
}else{
$_SESSION['username']=$_GET['username'];
$data = array(
array('code' => 3, 'message' => '登录成功','session'=>$_SESSION['username']),
);
echo json_encode($data);
}
}
}else{
$data = array(
array('code' => 4, 'message' => '没有此用户,请重新登录'),
);
echo json_encode($data);
}
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