# 21，重复旧的作法，只会得到旧的结果

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MGlJd5ORHAzlsAEfB22%2F-MGlJnGMpJleEmHBXqgW%2Fimage.png?alt=media\&token=d5a95e0c-d6b1-461c-90af-57edeaaa2177)