实例
<!DOCTYPE html>
<html>
<head>
<title>两种引入方式</title>
<meta charset="utf-8">
<style type="text/css">
.hs {
float:left;
list-style: none;
margin: 10px;
}</style>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#list > li').addClass('hs')
})
// 简写:
//$(function(){
//jq代码
// $('#list > li').addClass('hs')
// })
</script>
</head>
<body>
<h2>一</h2>
<ul id="list">
<li>123
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</li>
<li>2
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</li>
</ul>
</body>
<!--<script type="text/javascript" src="../js/jquery-3.3.1.js"></script> <本地引用 -->
<!--<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script> <外部引用-->
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