检查安卓IOS或微信

        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 = '
       }