尝试使用此快捷方式：
CTRL-^
Vim文档：help CTRL- ^：
06001
和：帮助备用文件
If there already was a current file name,then that one becomes the alternate file name. It can be used with “#” on the command line |:_#| and you can use the |CTRL-^| command to toggle between the current and the alternate file. However,the alternate file name is not changed when |:keepalt| is used. An alternate file name is remembered for each window.
