​x
 
<!DOCTYPE html>
<html>
<body>
​
<img onmouseover="bigImg(this)" onmouseout="normalImg(this)" border="0" src="/i/photo/smile.gif" alt="Smiley" width="128" height="128">
​
<p>当用户将鼠标指针移动到图像上时会触发函数 bigImg()。</p>
<p>当鼠标指针移出图像时会触发函数 normalImg()。</p>
​
<script>
function bigImg(x) {
  x.style.height = "256px";
  x.style.width = "256px";
}
​
function normalImg(x) {
  x.style.height = "128px";
  x.style.width = "128px";
}
</script>
​
</body>
</html>
​