function downloadCSVviaAJAX(url) {
    const xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'blob';
    
    xhr.onload = function(e) {
        if (this.status === 200) {
            const blob = new Blob([this.response], {type: 'text/csv'});
            const downloadUrl = URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = downloadUrl;
            a.download = 'data.csv'; // 设置下载文件名
            document.body.appendChild(a);
            a.click();
            setTimeout(() => {
                document.body.removeChild(a);
                URL.revokeObjectURL(downloadUrl);  
            }, 100);
        }
    };
    
    xhr.send();
}

async function downloadCSVviaFetch(url) {
    try {
        const response = await fetch(url);
        if (!response.ok) throw new Error('Network response was not ok');
        
        const blob = await response.blob();
        const downloadUrl = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = downloadUrl;
        a.download = 'data.csv';
        document.body.appendChild(a);
        a.click();
        setTimeout(() => {
            document.body.removeChild(a);
            URL.revokeObjectURL(downloadUrl);
        }, 100);
    } catch (error) {
        console.error('Download failed:', error);
    }
}