Operating environment:

Fedora 21 Terminal

question:

First configure imap jk <ESC> You can do it through jk<ESC>. I don’t know why it suddenly fails after using it. Press jk and directly output <ESC>.

Replenish:

imap jk <ESC> is written in the configuration file and is invalid.
I just executed :imap jk <ESC> in Normal mode and then entered Insert mode. However, it failed again after exiting vim and then entering again.
Very weird :(