在frame载入完成后立即弹出 "Frame is loaded" - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function load() {
      alert("Frame is loaded");
    }
  </script>
</head>
<frameset cols="50%,50%">
  <frame src="/examples/frame_a.htm" onload="load()">
    <frame src="/examples/frame_b.htm">
</frameset>
</html>
        