下面的例子可设置图像的高度和宽度 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function changeSize() {
      document.getElementById("compman").height = "250";
      document.getElementById("compman").width = "300";
    }
  </script>
</head>
<body>

  <img id="compman" src="/examples/compman.gif" width="107" height="98">
  <br><br>
  <input type="button" onclick="changeSize()" value="修改图像大小">

</body>
</html>
        