js 生成下载

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

// 使用示例
const data = 'Hello, world!';
downloadFile(data, 'hello.txt', 'text/plain');

function downloadFile(content, fileName, mimeType) {
    const dataUri = `data:${mimeType};charset=utf-8,${encodeURIComponent(content)}`;
    const a = document.createElement('a');
    a.href = dataUri;
    a.download = fileName;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
}

// 使用示例
const data = 'Hello, world!';
downloadFile(data, 'hello.txt', 'text/plain');