javascript 判断平板还是手机

function isTablet() {
    const userAgent = navigator.userAgent;
    const screenWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;

    // 检查User Agent中的关键词
    const tabletKeywords = ['tablet', 'ipad', 'android 3', 'android tablet'];
    const isTabletByUserAgent = tabletKeywords.some(keyword => userAgent.toLowerCase().includes(keyword));

    // 检查屏幕尺寸
    const minTabletWidth = 768; // 一般平板的最小宽度
    const isTabletBySize = screenWidth >= minTabletWidth && screenWidth < 1024; // 假设1024以上为笔记本或桌面

    return isTabletByUserAgent || isTabletBySize;
}

function isMobile() {
    const userAgent = navigator.userAgent;
    const screenWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;

    // 检查User Agent中的关键词
    const mobileKeywords = ['mobile', 'android', 'iphone', 'ipod'];
    const isMobileByUserAgent = mobileKeywords.some(keyword => userAgent.toLowerCase().includes(keyword));

    // 检查屏幕尺寸
    const maxMobileWidth = 767; // 一般手机的最大宽度
    const isMobileBySize = screenWidth <= maxMobileWidth;

    return isMobileByUserAgent || isMobileBySize;
}

// 使用示例
if (isTablet()) {
    console.log('This is a tablet.');
} else if (isMobile()) {
    console.log('This is a mobile device.');
} else {
    console.log('This is neither a tablet nor a mobile device.');
}