在线运行代码 - 菜鸟教程

<html>

<frameset cols="25%,50%,25%">
  <frame src="frame_a.htm">
  <frame src="frame_b.htm">
  <frame src="frame_c.htm">
  <noframes>Sorry, your browser does not handle frames!</noframes>
</frameset>

</html>

源代码

动行结果