制作一个事件动画效果
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>javascript</title>
</head>
<body>
<div style="width:100px;height:100px;background-color:blueviolet;" onclick="change(this);"></div>
</body>
<script>
function change(x){
x.style.borderRadius="50px";
}
</script>
</html>
//使方形变圆形