你可以使用keyspace事件来监听密钥过期事件，你需要两个不同的通道，一个用于发布事件（主通道），另一个用于监听过期事件，Redis的默认行为是只返回过期事件消息中过期元素的密钥，解决方法可以在here中找到，下面是使用该解决方法的简单实现：

import Redis from 'ioredis';

const subscribeChannel = new Redis({
   host: 'localhost',
   port: '6379',
   db: 0,
});

const publishChannel = new Redis({
   host: 'localhost',
   port: '6379',
   db: 0,
});

function set(channel, key, value, seconds){
   channel.set(key, value);

   // use shadowkey to access the value field on the expire event message
   channel.set(`${key}:${value}`, '');

   // set expire time on shadowkey
   channel.expire(`${key}:${value}`, seconds);
}

publishChannel.on('ready', () => {

   // configure keyspaces event and specify expiring events with "Ex"
   publishChannel.config("SET", "notify-keyspace-events", "Ex");

   // subscribe to the 
   subscribeChannel.subscribe("__keyevent@0__:expired");

   // listen for expiring event messages
   subscribeChannel.on('message', async(channel, message) => {

   // retrieve key and value from shadowkey
   const [key, value] = message.split(":");

   // store value in the main storage
   db.insert(value);

   // delete actual value from the redis store
   publishChannel.del(key);
 });

   // set "value" with "key" and set it to expire after 10 seconds
   set(publishChannel, "key", "value", 10);

});