点击灯泡开/关灯

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<body>
  <script>
    function changeImage() {
      element = document.getElementById('myimage')
      if (element.src.match("bulbon")) {
        element.src = "/images/pic_bulboff.gif";
      } else {
        element.src = "/images/pic_bulbon.gif";
      }
    }
  </script>
  <img id="myimage" onclick="changeImage()" border="0" src="/images/pic_bulboff.gif" width="100" height="180">
  <p>点击灯泡 开/关 灯</p>

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点击灯泡 开/关 灯