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use int if you have a small number of classes,，这一点在快连下载安装中也有详细论述

，更多细节参见91视频

Both are good which one do you like let me know in the comment.，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。

const time = (target - pos) / sp;