<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery.min.js"></script>
</head>
<body>
<div>我是div</div>
<div class="nav">我是nav div</div>
<p>我是p</p>
<ol>
<li>我是ol的</li>
</ol>
<ul>
<li>我是ul的</li>
</ul>
<script>
$(function() {
$(".nav")
console.log($(".nav"));
console.log($("ul li"));
})
</script>
</body>
</html>