当鼠标指针移至图片之上时运行脚本 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script>
    function bigImg(x) {
      x.style.height = "64px";
      x.style.width = "64px";
    }

    function normalImg(x) {
      x.style.height = "32px";
      x.style.width = "32px";
    }
  </script>
</head>
<body>

  <img onmouseover="bigImg(this)" onmouseout="normalImg(this)" border="0" src="/examples/smiley.gif" alt="Smiley" width="32" height="32">

  <p>当用户将鼠标移动到图片上时触发 bigImg() 函数。该函数使图片变大。</p>
  <p>当用户将鼠标移开图片时触发 normalImg() 函数。该函数使图片变回原来大写。</p>

</body>
</html>
        