js 执行下载

function downloadFile(url, filename) {
    const a = document.createElement('a');
    a.href = url;
    a.download = filename || 'download';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
}

// 使用示例
downloadFile('https://example.com/path/to/file.pdf', 'myfile.pdf');

function downloadBlob(content, mimeType, filename) {
    const blob = new Blob([content], { type: mimeType });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = filename || 'download';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url); // 释放URL对象
}

// 使用示例：下载JSON数据
const data = { key: 'value' };
downloadBlob(JSON.stringify(data), 'application/json', 'data.json');

async function fetchAndDownload(url, filename) {
    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 = filename || 'download';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(downloadUrl);
}

// 使用示例
fetchAndDownload('https://example.com/path/to/file.jpg', 'myimage.jpg');