$(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/open/libs/weui/0.4.1/weui.css">';
                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">請在微信客戶端開啟連結</h4></div></div>';
            }
       })

將這串程式碼放入頁面即可