HOw to reserve an echo within a func after calling the func?

[Yue Wu]

I have a func:

func Hi()
  echo "hi"
  return ""
endfunc

When I invoke it in insert mode by

     <C-R>=Hi()<CR>

the echo will go away immidiately after call the func as there isn't such
an echo, how can I prevent its goaway and remain in the screen's bottom
line after call the func?

-- 
Regards,
Van.

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