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!DOCTYPE html>
<html lang="cn">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<table border="1" id="tb">
<tr>
<th>序号</th>
<th>站点名</th>
<th>网址</th>
</tr>
<tr>
<td>1</td>
<td>Google</td>
<td>google.com</td>
</tr>
<tr>
<td>2</td>
<td>Runoob</td>
<td>runoob.com</td>
</tr>
<tr>
<td>3</td>
<td>Taobao</td>
<td>taobao.com</td>
</tr>
<tr>
<td>4</td>
<td>Baidu</td>
<td>baidu.com</td>
</tr>
<tr>
<td>5</td>
<td>Sina</td>
<td>sina.com.cn</td>
</tr>
<tr>
<td>6</td>
<td>Facebook</td>
<td>facebook.com</td>
</tr>
<tr>
<td>7</td>
<td>twitter</td>
<td>twitter.com</td>
</tr>
<tr>
<td>8</td>
<td>youtube</td>
<td>youtube.com</td>
</tr>
</table>
<script src="jquery-3.1.1.min.js"></script>
</body>
$("table tr").css("background-color","red");
$("table>tbody>tr").css("background-color","red");
<!DOCTYPE html>
<html lang="cn">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="father">
<span class="red">1</span>
<ul>2
<p>21</p>
<p>22</p>
<p>23</p>
<p>21</p>
<p>22</p>
<p>23</p>
</ul>
<span class="green">3</span>
<p>4</p>
<p id="green">5</p>
<p>6</p>
</div>
<script src="jquery-3.1.1.min.js"></script>
</body>
$("div>p")或$("#father>p")就能选择到p元素。
即$("div>p").css("color","red");就有效的。