1. JavaScript的onmouseover和onmouseout
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>鼠标移入移出</title>
<style>
#d{
width:100px;
height:100px;
border:2px solid #000;
}
</style>
<script type="text/javascript">
function on(){
document.getElementById("d").style.backgroundColor="#F00";
}
function out(){
document.getElementById("d").style.backgroundColor="#000";
}
</script>
</head>
<body>
<div id="d" onmouseover="on()" onmouseout="out()"></div>
</body>
</html