PHP为页面设置访问密码，加密出访，不分后程序，只要积极支持PHP就可以采用这段代码。

代码如下

<?php
// 密码 Cookie 加密盐
if(!defined('MK_ENCRYPT_SALT'))
define('MK_ENCRYPT_SALT', 'Kgs$JC!V');
/**
*/
function MkEncrypt($password, $pageid = 'default') {
$pageid     = md5($pageid);
$md5pw      = md5(md5($password).MK_ENCRYPT_SALT);
$postpwd    = isset($_POST['pagepwd']) ? addslashes(trim($_POST['pagepwd'])) : '';
$cookiepwd  = isset($_COOKIE['mk_encrypt_'.$pageid]) ? addslashes(trim($_COOKIE['mk_encrypt_'.$pageid])) : '';
if($cookiepwd == $md5pw) return;    // Cookie密码验证恰当
if($postpwd == $password) {         // 提交的密码正确
setcookie('mk_encrypt_' . $pageid, $md5pw, time() + 3600000, '/');
return;
}
?>


 
 
 
 




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html,body{width:100%;height:100%}
body{background-color:#F4F6F9;color:#768093}
input,button{font-size:1em;border-radius:3px;-webkit-appearance:none}
input{width:100%;padding:5px;box-sizing:border-box;border:1px solid #e5e9ef;background-color:#f4f5f7;resize:vertical}
input:focus{background-color:#fff;outline:none}
button{border:0;background:#6abd09;color:#fff;cursor:pointer;opacity:1;user-select:none}
button:hover,button:focus{opacity:.9}
button:active{opacity:1}
.main{width:100%;max-width:500px;height:300px;padding:30px;background-color:#fff;border-radius:2px;box-shadow:0 10px 60px 0 rgba(29,29,31,0.09);transition:all .12s ease-out;position:absolute;left:0;top:0;bottom:0;right:0;margin:auto;text-align:center}
.alert{width:80px}
.mk-side-form{margin-bottom:28px}
.mk-side-form input{float:left;padding:2px 10px;width:77%;height:37px;border:1px solid #ebebeb;border-right-color:transparent;border-radius:2px 0 0 2px;line-height:37px}
.mk-side-form button{position:relative;overflow:visible;width:23%;height:37px;border-radius:0 2px 2px 0;text-transform:uppercase}
.pw-tip{font-weight:normal;font-size:26px;text-align:center;margin:25px auto}
#pw-error {color: red;margin-top: 15px;margin-bottom: -20px;}
.return-home{text-decoration:none;color:#b1b1b1;font-size:16px}
.return-home:hover{color:#1E9FFF;letter-spacing:5px}