xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><head><script>function lighton(){ document.getElementById('myimage').src="/statics/images/course/pic_bulbon.gif";}function lightoff(){ document.getElementById('myimage').src="/statics/images/course/pic_bulboff.gif";}</script></head><body><img id="myimage" onmousedown="lighton()" onmouseup="lightoff()" src="/statics/images/course/pic_bulboff.gif" width="100" height="180" /><p>点击不释放鼠标灯将一直亮着!</p></body></html>