How to remove ^m characters in Vim

Dos/windows-based text files have a CR (carriage return) and LF (line wrapping) at the end of each line, and UNIX text has only one line break, that is, win each line ends with \ r \ n, and Linux has only one \ n
If the document on win is uploaded to Linux, a ^m will appear at the end of each line (^m is ctrl+v,ctrl+m)
If it is a single document, you can open with VI, execute:%s/^m//g to remove ^m,
But if the bulk of the removal of words can not use VI,

Command with SED
Convert the win document to a Linux document:
Find./-type F print0 | xargs-0 sed-i ' s/^m$//'

Convert the files under Linux to win
Find./-type F print0 | xargs-0 sed-i ' s/$/^m/' %s/\r//g

How to remove ^m characters in Vim