如何将两行代码变成一行，如下： if test.valid? 快捷键变成 if test.valid?,
找到了，vim Shift-j
M-^ (delete-indentation)
M-^ runs the command delete-indentation (found in global-map), which is an interactive compiled Lisp function in `simple.el’.
It is bound to M-^.
(delete-indentation &optional ARG)
Join this line to previous and fix up whitespace at join. If there is a fill prefix, delete it from the beginning of this line. With argument, join this line to following line.
非常感谢，请问平时遇到问题去哪里查找文档？
SPC h SPC Spacemacs自带的文档 C-h emacs 的在线帮助功能，你不用它上帝都会谴责你的。 以及我觉得你可能需要先学vim。