判断当前设备为移动端

function detectmob() {
        if( navigator.userAgent.match(/Android/i)
        || navigator.userAgent.match(/webOS/i)
        || navigator.userAgent.match(/iPhone/i)
        || navigator.userAgent.match(/iPad/i)
        || navigator.userAgent.match(/iPod/i)
        || navigator.userAgent.match(/BlackBerry/i)
        || navigator.userAgent.match(/Windows Phone/i)
        ){
            return true;
        }
        else {
            return false;
        }
}