为什么不变色?
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jQuery对象转化成DOM对象</title>
<script src="../js/jquery-3.4.1.min.js4"></script>
</head>
<body>
<div>我是谁?</div>
<div>你是谁??</div>
<div>他是谁???</div>
<script type="text/javascript">
var $aa=$('div');//jQuery对象
var aaa=$aa.get(0);
aa.style.color='blue';
</script>
</body>
</html>