:help key-notation

说：

notation    meaning            equivalent  decimal    value(s)
-----------------------------------------------------------------------
<CR>        carriage return        CTRL-M    13       *carriage-return*
<Return>    same as <CR>                              *<Return>*
<Enter>     same as <CR>                              *<Enter>*

映射通常涉及Ex命令，您必须按< CR>执行它们以便它包含在映射中。