JS判断是否为移动端

var mobilecheck = function() {
 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)
  || navigator.userAgent.match(/MQQBrowser/i)
 ){
    return true;
  }
 else {
    return false;
  }
}