在vim的命令行中输入:help mouse 就可以找到答案，查看鼠标的配置方案。
vi的三种模式:命令模式,插入模式,可视模式.鼠标可以用于启动各种模式:
The mouse can be enabled for different modes:
n Normal mode
v Visual mode
i Insert mode
c Command-line mode
h all previous modes when editing a help file
a all previous modes
r for |hit-enter| and |more-prompt| prompt
Normally you would enable the mouse in all four modes with:
:set mouse=a
When the mouse is not enabled, the GUI will still use the mouse for
modeless selection. This doesn't move the text cursor.
所以配置文件中的set mouse=a启动了所有模式,这样就屏蔽了鼠标右健功能.
来源：oschina
链接：https://my.oschina.net/u/1395664/blog/1925241