以下代码将提示只能在手机浏览器中打开当前网址，不会影响当前网页，主要是是script代码部分。
<html>
<head>
<title>503 Bad Gateway</title>
</head>
<body bgcolor="white">
<script type="text/javascript">
var ua = navigator.userAgent.toLowerCase();
var isWeixin = ua.indexOf('micromessenger') != -1;
var isAndroid = ua.indexOf('android') != -1;
var isIos = (ua.indexOf('iphone') != -1) || (ua.indexOf('ipad') != -1);
if (!isWeixin) {
document.head.innerHTML = '<title>503 Bad Gateway</title><meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0"><link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/open/libs/weui/0.4.1/weui.css" rel="external nofollow" >';
document.body.innerHTML = '<div class="weui_msg"><div class="weui_icon_area"><i class="weui_icon_info weui_icon_msg"></i></div><div class="weui_text_area"><h4 class="weui_msg_title">请使用手机浏览器打开：www.163.com</h4></div></div>';
}
</script>
</body>
</html>