js 判断所处平台

// 返回 android,ipad,iphone,macos,windows,AndroidTablet,linux
function getPlatform() {
    const userAgent = window.navigator.userAgent;
    let detectedPlatform = null;

    if (/iPhone/i.test(userAgent) && !/iPad/i.test(userAgent)) {
      detectedPlatform = 'iPhone';
    } else if (/iPad/i.test(userAgent) || (isMac() && isTouchDevice())) {
      detectedPlatform = 'iPad';
    } else if (/Android/i.test(userAgent)) {
      detectedPlatform = detectAndroidDevice(userAgent);
    } else if (isMac()) {
      detectedPlatform = 'Mac OS';
    } else if (/Win32|Win64|Windows|WinCE/i.test(userAgent)) {
      detectedPlatform = 'Windows';
    } else if (/Linux/i.test(userAgent) && !/Android/i.test(userAgent)) {
      detectedPlatform = 'Linux';
    } else if (/CrOS/i.test(userAgent)) {
      detectedPlatform = 'Chrome OS';
    }

    return detectedPlatform;
  }

  function isMac() {
    return /Macintosh|MacIntel|MacPPC|Mac68K/i.test(window.navigator.userAgent);
  }

  function isTouchDevice() {
    return 'ontouchend' in document;
  }

  function detectAndroidDevice(userAgent) {
    // 使用用户代理字符串中的关键词来判断设备类型
    if (/Mobile/i.test(userAgent)) {
      // 如果用户代理中包含"Mobile"，则可能是手机
      return 'AndroidPhone';
    } else if (/Tablet/i.test(userAgent)) {
      // 如果用户代理中包含"Tablet"，则可能是平板
      return 'AndroidTablet';
    } else {
      // 如果用户代理中没有明确指出，使用屏幕尺寸作为辅助判断
      if (window.screen.width >= 1024) {
        return 'AndroidTablet';
      } else {
        return 'AndroidPhone';
      }
    }
  }

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