<!DOCTYPE html>
<html>
<body>
<script>
function changeImage() {
element = document.getElementById('myimage')
//这里的src是什么意思?
if (element.src.match("bulbon")) {
element.src = "eg_bulboff.gif";
} else {
element.src = "eg_bulbon.gif";
}
}
</script>
<img id="myimage" onclick="changeImage()" src="eg_bulboff.gif">
<p>点击灯泡来点亮或熄灭这盏灯</p>
</body>
</html>