js第一个动画效果
<!DOCTYPE html>
<html>
<head>
<title>事件</title>
</head>
<body>
<script type="text/javascript">
function myclic (y) {
y.style.borderRadius = '50px'
}
</script>
<div style="width: 100px;height: 100px;border: 1px solid #ccc; background: pink;" onclick="myclic(this)"></div>
</body>
</html>