IndexedDB 软删除与归档策略实践

概述软删除可避免误删。本文示例标记删除与归档迁移，并提供清理策略。标记删除与归档function openDB(name) { return new Promise((resolve, reject) => { const r = indexedDB.open(name, 1); r.onupgradeneeded = () => { const db = r.result; if (!db.objectStoreNames.contains('items')) db.createObjectStore('items', { keyPath:'id' }); if (!db.objectStoreNames.contains('arch')) db.createObjectStore('arch', { keyPath:'id' }); }; r.onsuccess = () => resolve(r.result); r.onerror = () => reject(r.error); }); } async function softDelete(id) { const db = await openDB('soft'); const tx = db.transaction(['items','arch'],'readwrite'); const s = tx.objectStore('items'); const a = tx.objectStore('arch'); const rec = await new Promise((res, rej) => { const r = s.get(id); r.onsuccess = () => res(r.result); r.onerror = () => rej(r.error); }); if (rec) { rec.deleted = true; a.put(rec); s.delete(id); } await new Promise((res, rej) => { tx.oncomplete = res; tx.onerror = () => rej(tx.error); }); db.close(); } async function vacuum() { const db = await openDB('soft'); const tx = db.transaction('arch','readwrite'); const store = tx.objectStore('arch'); const req = store.openCursor(); const now = Date.now(); await new Promise((res, rej) => { req.onsuccess = e => { const c = e.target.result; if (c) { if ((now - (c.value.updatedAt || now)) > 30*24*3600*1000) c.delete(); c.continue(); } else res(); }; req.onerror = () => rej(req.error); }); db.close(); }