vim shortcut F3 key mapping problem in screen environment

Use screen to open the terminal. When using vim, the map of <F3> does not work. Every time NERDTree should be opened, the result is to insert an R. I checked the configuration problem of vimrc for a long time, but did not find the reason. Finally, I tried to modify .screenrc and changed "term linux" to "term xterm", and the result was good.