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判斷頁面必須在微信中開啟

<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0">
    <script src="https://cdn.bootcss.com/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
    <script type="text/javascript">
        $(function(){
            var ua = navigator.userAgent.toLowerCase();
            var isWeixin = ua.indexOf('micromessenger') != -1;
            if (!isWeixin) {
                document.head.innerHTML =
                    '<title>抱歉,出錯了</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/connect/zh_CN/htmledition/style/wap_err1a9853.css">';
                document.body.innerHTML =
                    '<div class="page_msg"><div class="inner"><span class="msg_icon_wrp"><i class="icon80_smile"></i></span><div class="msg_content"><h4>請在微信客戶端開啟連結</h4></div></div></div>';
            }
        })
    </script>
</body>
</html>

在其他瀏覽器開啟效果圖: