function checkDeviceAndAlert() {
    const userAgent = navigator.userAgent || navigator.vendor || window.opera;
    
    const mobileRegex = /android|iphone|ipad|ipod|blackberry|iemobile|opera mini|mobile|windows phone|phone|webos|kindle|tablet/i;

    const isMobile = mobileRegex.test(userAgent.toLowerCase());
    
    if (isMobile) {
        alert("移动设备访问");
    } else {
        alert("电脑设备访问");
    }
}

window.addEventListener('DOMContentLoaded', checkDeviceAndAlert);