js限制网站只能在手机或者微信内访问

//以下是限制只能在微信内置浏览器访问
 var useragent = navigator.userAgent;
    if (useragent.match(/MicroMessenger/i) != 'MicroMessenger') {
        // 这里警告框会阻塞当前页面继续加载
        alert('请使用微信访问！');
        // 以下代码是用javascript强行关闭当前页面
        var opened = window.open('about:blank', '_self');
        opened.opener = null;
        opened.close();
    }


//以下是限制只能在手机上访问
var system = {};
var p = navigator.platform;
var u = navigator.userAgent;
 
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
if (system.win || system.mac || system.xll) {//如果是PC转 
    if (u.indexOf('Windows Phone') > -1) {  //win手机端
 
    }
    else {
        window.location.href = "http://weixin.sogou.com";
    }
}
    }