function split(szFullString, szSeparator)
local nFindStartIndex = 1
local nSplitIndex = 1
local nSplitArray = {}
while true do
   local nFindLastIndex = string.find(szFullString, szSeparator, nFindStartIndex)
   if not nFindLastIndex then
    nSplitArray[nSplitIndex] = string.sub(szFullString, nFindStartIndex, string.len(szFullString))
    break
   end
   nSplitArray[nSplitIndex] = string.sub(szFullString, nFindStartIndex, nFindLastIndex - 1)
   nFindStartIndex = nFindLastIndex + string.len(szSeparator)
   nSplitIndex = nSplitIndex + 1
end
return nSplitArray
end

function main(g,q,m)
if m == "" then
	sendGroupMsg(g,"条件不能为空！")
	return
end
tblret = split(m, " ")
ubound = #tblret
sendGroupMsg(g,"结果是：" .. tblret[math.floor(math.random(1,ubound))])
end