限制必须使用微信打开网页

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function is_weixin(){
            var ua = navigator.userAgent.toLowerCase();
            if(ua.match(/MicroMessenger/i)=="micromessenger") {
                return true;
             } else {
                return false;
            }
        }
        
        if (!is_weixin()) {
            window.location.href = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxdf3f22ebfe96b912&redirect_uri=xxx&response_type=code&scope=snsapi_base&state=hyxt#wechat_redirect';
        }