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0403作业
烟火的博客
Original
426 people have browsed it

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>选择器</title>
	<style type="text/css">

		table, td {
			border:1px solid green;
		}


		table {
			width: 75%;
			margin: 20px auto;
			border-collapse: collapse;
			text-align: center;
		}

		table caption {
			font-size: 1.8em;
			margin-bottom: 15px;
		}


		.bg-orange {
			font-weight: bolder;
			color: white;
			background-color: orange;
		}
	</style>
</head>
<body>
	<table>
		<caption>用户信息表</caption>

		<tr id="title">
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
			<td>06</td>
			<td>07</td>
			<td>08</td>
			<td>09</td>
			<td>10</td>
		</tr>
		<tr>
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
			<td>06</td>
			<td>07</td>
			<td>08</td>
			<td>09</td>
			<td>10</td>
		</tr>
		<tr class="choose">
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
			<td>06</td>
			<td>07</td>
			<td>08</td>
			<td>09</td>
			<td>10</td>
		</tr>
		<tr>
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
			<td>06</td>
			<td>07</td>
			<td>08</td>
			<td>09</td>
			<td>10</td>
		</tr>
		<tr class="choose">
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
			<td>06</td>
			<td>07</td>
			<td>08</td>
			<td>09</td>
			<td>10</td>
		</tr>
		
		
	</table>
</body>
</html>
<!-- 基本格式都是一样的，套用css的样式即可 -->
<script type="text/javascript" src="../js/jquery-3.3.1.js"></script>
<script type="text/javascript">
	//1. tag标签选择器
	$('td').css('backgroundColor','lightblue')

	//2.id选择器
	//把td上的背景去掉,否则会层叠覆盖
	$('#title').css('backgroundColor','lightgreen')

	//3.class类选择器
	$('.choose').addClass('bg-orange')

	//4.*通配选择符
	$('tr:nth-child(3) ~ *').css('font-size', '1.5em')


</script>

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Correction status：Uncorrected

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