检测设备 - 手机、平板、电脑（电脑调整不影响）

    var os = function (){
      var ua = navigator.userAgent,
      isWindowsPhone = /(?:Windows Phone)/.test(ua),
      isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,
      isAndroid = /(?:Android)/.test(ua),
      isFireFox = /(?:Firefox)/.test(ua),
      isChrome = /(?:Chrome|CriOS)/.test(ua),
      isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),
      isPhone = /(?:iPhone)/.test(ua) && !isTablet,
      isPc = !isPhone && !isAndroid && !isSymbian;
      return {
          isTablet: isTablet,
          isPhone: isPhone,
          isAndroid: isAndroid,
          isPc: isPc
      };
  }();
    $(document).ready(function() {
        if (os.isAndroid || os.isPhone) {
            console.log("手机")
        } else if (os.isTablet) {
            console.log("平板")
        } else if(os.isPc) {
            console.log("电脑")
        }
});