File System Access 批量权限校验与错误恢复策略

概述批量写入前需统一权限校验并准备恢复策略。本文提供封装与错误处理实践。批量校验与写入async function requestRW(handle) {

if (typeof handle.requestPermission === 'function') {

const s = await handle.requestPermission({ mode: 'readwrite' });

return s === 'granted';

}

return true;

}

async function ensureAllPermissions(handles) {

for (const h of handles) {

const ok = await requestRW(h);

if (!ok) throw new Error('permission denied');

}

}

async function writeBatch(entries) {

try {

await ensureAllPermissions(entries.map(e => e.handle));

for (const e of entries) {

const w = await e.handle.createWritable();

await w.write(e.bytes);

await w.close();

}

} catch (err) {

// 记录失败项并重试或提示用户重新授权

}

}