JS判断当前设备类型：手机/平板/电脑_js判断是华为手机还是pad

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,
  }
})()
console.log('os', os)
if (os.isAndroid || os.isPhone) {
  // 手机
} else if (os.isTablet) {
  // 平板
} else if (os.isPc) {
  // 电脑
}