This sets up an autocommand group, and removes any previous handlers (via the autocmd!
这会设置一个自动命令组，并删除所有之前的处理器（通过 autocmd!
To see the complete list of these events, type: help autocmd-events on the Vim command line.
要查看此类事件的全部清单，在Vim命令行输入：help autocmd - events。
The event name is one of the 78 valid Vim event names (as listed under: help autocmd-events).
事件名称是78种有效Vim事件名称(如：help autocmd - events所列示)之一。
应用推荐