js 判断设备类型包括异形屏

本方法主要判断设备为手机、平板、异形屏（覆盖不全，能覆盖大多数）

export enum DEVICE {
  PHONE = 'phone',
  PAD = 'pad',
  SPECIAL = 'special-shape'
}


function getPlatform () {
  const userAgent = navigator.userAgent.toLowerCase()

  // 已知的部分折叠屏设备的关键字列表
  const foldableKeywords = [
    'samsung galaxy z fold',
    'samsung galaxy z flip',
    'huawei mate x',
    'huawei p50 pocket',
    'motorola razr',
    'oppo find n'
  ]

  // 正则表达式：匹配三星折叠屏设备
  const pattern = /sm-f\d{4}/

  const clientWidth = document.documentElement.clientWidth
  const clientHeight = document.documentElement.clientHeight

  const min = Math.min(clientWidth, clientHeight)
  const max = Math.max(clientWidth, clientHeight)
  const aspectRatio = min / max


  if (pattern.test(userAgent) || foldableKeywords.some(keyword => userAgent.includes(keyword))) {
    // 折叠屏判断逻辑
    if (aspectRatio < 0.85) {
      return DEVICE.PHONE
    } else {
      // 宽高很接近时，判定为异型屏手机
      return DEVICE.SPECIAL
    }
  } else {
    // 非折叠屏走正常判断
    const isIpad = /ipad/.test(userAgent)
    // const isAndroidTablet = /android/.test(userAgent) && !/mobile/.test(userAgent) // 2025-08-01 Android Pad 正则有问题，会把折叠屏手机误判为平板
    const isIpadOS = navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1
    const specialSize = (clientWidth > 700 && clientHeight > 1000) || (clientWidth > 1000 && clientHeight > 700)

    if (isIpad || isIpadOS || specialSize) {
      return DEVICE.PAD
    } else {
      if (aspectRatio < 0.85) {
        // if (isAndroidTablet) {
        //   return DEVICE.PAD
        // }
        return DEVICE.PHONE
      } else {
        // 宽高很接近时，判定为异型屏手机
        return DEVICE.SPECIAL
      }
    }
  }
}