更变图形形状
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.d{
width: 100px;
height: 100px;
border: 1px solid black;
}
</style>
</head>
<body>
<script type="text/javascript">
function d (a) {
// var a=document.getElementsByClassName("d");
a.style.background="red";
a.style.borderRadius="50px";
}
</script>
<div class="d" onclick="d(this)"></div>
</body>
</html>
效果：
