cocos判断中文字符

local str = "abced啊ef"local i = 1local b = 1for k = 1,string.utf8len(str) dolocal size = string.byte(str,b)if size >= 127 then              i = i + 3               b = b + 3      print("中文",string.sub(str,i,i + 2))else               i = i + 1               b= b + 1              print("英文",string.sub(str,i,i))endend