JS强制页面只能在微信内置浏览器打开

放到页脚即可

<script type="text/javascript" src="https://code.xulgr.com/pub/js/jquery-1.8.2.min.js"></script>
<script type="text/javascript">
// 对浏览器的UserAgent进行正则匹配，不含有微信独有标识的则为其他浏览器  
var useragent = navigator.userAgent;
if (useragent.match(/MicroMessenger/i) != 'MicroMessenger') {
// 以下是官方的请在微信客户端打开链接的样式
document.head.innerHTML = '<title>抱歉，出错了</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">';
document.body.innerHTML = '<p><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">请在微信客户端打开链接</h4></div></div></p>';
}
</script>