const redis = require('ioredis');

const clienId = Math.random() * 100; //模拟客户端Id

const lockKey = 'testKey'

try {

    const result = await redis.setnx(lockKey, clienId, 'EX', 10); //防止死锁,10秒

    if (result == 0) {

        return '系统繁忙!';

    }

    //省略去库存等业务操作

} catch (error) {

} finally {

    if (clienId == await redis.get(lockKey)) {

        await redis.del(lockKey);

    }

}