我的学习作业
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="big" style="width:50px; height:50px; background:red;" onmouseover="t(this)">多少</div>
</body>
<script>
function t(pic) {
pic.style.background = "blue";
}
</script>
</html>