Ajax 和 JavaScript 验证练习
Ajax 和 JavaScript 验证用户登录
index.html
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <script src="./js/ajax.js"></script>
- <title>用户登录</title>
- <style type="text/css">
- .text {
- width:180px;
- height:21px;
- }
- .userRed {
- border: 1px solid red;
- width:180px;
- height:21px;
- }
- </style>
- </head>
- <body>
- <table border="0" align="center" style="font-size:13px;" width="300">
- <tr>
- <td align="center" colspan="2"><div id="con"></div></td>
- </tr>
- <tr>
- <td align="right" height="30">用户名:</td><td><input type="text" name="user" id="user" class="text" /></td>
- </tr>
- <tr>
- <td align="right" height="30">密码:</td><td><input type="password" name="password" id="password" class="text" /></td>
- </tr>
- <tr>
- <td align="center" colspan="2"><input type="button" id="btn" value="登录" /> <input type="button" value="重置" id="re" /></td>
- </tr>
- </table>
- </body>
- </html>
- <script src="./js/login.js"></script>
login.js
- var btn = document.getElementById('btn');
- var re = document.getElementById('re');
- var user = document.getElementById('user');
- var password = document.getElementById('password');
- btn.onclick = function(){
- var isValidate=false;
- if (!user.value.match(/^\S{2,20}$/)) {
- user.className = 'userRed';
- user.focus();
- return;
- } else {
- user.className = 'text';
- isValidate=true;
- }
- if (password.value.length<3 || password.value.length>20) {
- password.className = 'userRed';
- password.focus();
- return;
- } else {
- password.className = 'text';
- isValidate=true;
- }
- if (isValidate) {
- var ajax = Ajax();
- ajax.get('login.php?user='+document.getElementById('user').value+'&password='+document.getElementById('password').value, function(data){
- var con = document.getElementById('con');
- eval(data);
- if (login) {
- con.innerHTML = '<font color="green">登录成功,跳转中...</font>';
- location = 'xx.php'; // 登录成功后指定跳转页面
- } else {
- con.innerHTML = '<font color="red">帐号或密码错误!</font>';
- }
- });
- }
- }
- re.onclick = function(){
- user.value="";
- password.value="";
- }
login.php
- <?php
- require_once './config.inc.php';
- $m = new Model();
- $user = $_GET['user'];
- $password = $_GET['password'];
- $count = $m->total('users', "user='". $user ."' and password='". sha1($password) ."'");
- if ($count) {
- setcookie('user', $user);
- echo "var login=true";
- } else {
- echo "var login=false";
- }
- ?>
效果展示图:
ajax.js 文件在前面文章可以找到,数据库结构就两个字段(user,password)即可!