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个性化推荐中，'已读'用redis或memcache缓存,是不是每增加一个用户，就得设置一个key？
There must be a unique key to identify this user. You'd better add a prefix to match the user ID to distinguish each user. For example, if you have read, use the read link user ID to identify this user
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
There must be a unique key to identify this user. You'd better add a prefix to match the user ID to distinguish each user. For example, if you have read, use the read link user ID to identify this user