Defer.async(async (d) => {
    const db = await openDB() // open resource
    // close db
    d.defer(async () => await db.close())
    const f = await openFile('date.log') // open resource
    // close file
    d.defer(async () => await f.close())

    // some logic code logic
    const text = await f.readAll()
    const result = await db.set('log', text)

    return result // After the function returns, defer will call the registered cleanup function according to the first in, last out
})