唯一更改的是新安装的Anaconda。但是我不认为这是问题。在对R 3.5.1进行新的更新之后，我像往常一样尝试在终端中运行R，得到的结果如下。对我来说，这没有任何意义，因为我安装了devtools，而3.4.3并不是我已经运行了一段时间的版本。它可能是Anaconda中运行的版本，但是我的终端使用它而不是最新版本仍然没有意义。我已经运行ls -l /Library/Frameworks/R.framework/Versions/，它是正确的版本。 R和RStudio运行正常。任何帮助表示赞赏。谢谢
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Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, :
there is no package called ‘devtools’