在线运行代码 - 代码学院 www.codexy.cn

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>代码学院(codexy.cn)</title>
</head>
<body>

<img onmouseenter="bigImg(this)" onmouseleave="normalImg(this)" border="0" src="smiley.gif" alt="Smiley" width="32" height="32">
<p>
bigImg() 函数在用户将鼠标指针移动到该图像时触发。</p>
<p>
normalImg() 函数在用户将鼠标指针移出图像时触发。</p>
<script>
function bigImg(x) {
    x.style.height = "64px";
    x.style.width = "64px";
}
function normalImg(x) {
    x.style.height = "32px";
    x.style.width = "32px";
}
</script>

</body>
</html>

源代码

动行结果