Content-Disposition 下载文件名解析与 FSA 保存实践

概述通过解析 `Content-Disposition` 获取服务器建议文件名，并完成本地保存。解析与保存function parseFilename(cd) {

if (!cd) return 'download';

const m = cd.match(/filename\*=UTF-8''([^;]+)|filename="?([^";]+)"?/i);

return decodeURIComponent(m?.[1] || m?.[2] || 'download');

}

async function saveResponse(url) {

const res = await fetch(url);

const name = parseFilename(res.headers.get('Content-Disposition'));

const h = await window.showSaveFilePicker({ suggestedName: name });

const ws = await h.createWritable();

const ab = await res.arrayBuffer();

await ws.write(new Uint8Array(ab));

await ws.close();

}