VIM mapping large K

fun! Ysdk()
" Large mapping K"
:norm "+yiw
"
let i=@+
if len(i)<1
    return
endif
let c=i[0]
" Use Chinese "
if (!Szw(c))
    norm!K
    " Execute original K"
    return 
endif
call Xsdy(i)
endf

First Current cursor The following words , Then judge the first character , If chinese , take chinese Definition . otherwise , Use the original K.