lua_删除指定目录下指定后缀的文件

function QMPlugin.GetFileType(path)
  sh_init()
  local iRet, sRet = pcall(function()
    s,e = string.find(path,"%.")
    local str = string.sub(path,s+1 ,-1)
    if str then
      return str
    else
      return ""
    end
  end)
  if iRet == true then
    return sRet
  else
    print(sRet)
    return ""
  end
end