document.addEventListener('DOMContentLoaded', function() {
    var userAgent = navigator.userAgent || navigator.vendor || window.opera;
    var downloadButton = document.getElementById('downloadButton');
    var downloadIcon = document.getElementById('downloadIcon');
	
	
    // 安卓和iOS的下载链接和图标
    var androidDownloadLink = "https://www.aaaalfa.app";// 安卓app
    var iosDownloadLink = "https://www.aaaalfa.app"; // iOS描述文件下载链接
    var androidIcon = "./skin/images/android.gif"; // 安卓图标路径
    var iosIcon = "./skin/images/ios.gif"; // iOS图标路径

    if (/android/i.test(userAgent)) {
        // 如果是Android用户
        downloadButton.href = androidDownloadLink;
        downloadIcon.src = androidIcon;
        downloadIcon.alt = "Download for Android";
    } else if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        // 如果是iOS用户
        downloadButton.href = iosDownloadLink;
        downloadIcon.src = iosIcon;
        downloadIcon.alt = "Download for iOS";
    } else {
        // 对于其他操作系统，不显示下载按钮
        downloadButton.style.display = 'none';
    }
});