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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jQuery</title>
<!--两种引入方式：
<script type="text/javascript" src='http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js'></script> -->
<script type="text/javascript" src=js/jquery-3.3.1.js></script>
</head>
<body>
<ul>
<li>HTML</li>
<li>CSS</li>
<li>JS</li>
<li>jquery</li>
<li>PHP</li>
</ul>
<h2 sytle='backgroup-color'>正在学习php.cn jquery </h2>
<script type="text/javascript">
$('h2').css('color','red')
$('h2').click(function(){alert("弹出信息框")})
$('li:eq(3)').css('backgroundColor','red')
$('li:eq(4)').html('正在学习中')
$('li')[2].style.backgroundColor = 'coral'
$("<img src='https://img.php.cn/upload/avatar/000/041/989/5aa9e79cf1f4d822.jpg' width='150'>").insertAfter('li:eq(2)').css("border-radius","50%")
// window.onload = function(){ alert("welcome"); }
$(document).ready(function(){alert("DOM元素后")})
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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