这是因为 SuperTab 的默认补全是 ，它向后循环(所以匹配 beforeem>，而不是在光标首先出现之后，这通常是您想要的).如文档所述，您可以通过以下方式更改:

This is because SuperTab's default completion is <C-p>, which cycles backwards (so matches before, not after the cursor are presented first, which is usually what you want). As documented, you can change that via:

let g:SuperTabDefaultCompletionType = "<c-n>"

(把它放到你的 ~/.vimrc 中.)

(Put this into your ~/.vimrc.)