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Jquery 标签属性，样式
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实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Jquery元素属性提取及修改</title>
	<style type="text/css">
		.bg{
			width: 300px;
			height: 300px;
			background-color: #999;
			position: relative;
		}
		.yj{
			border-radius: 50%;
		}
		.yy{box-shadow: 5px 5px 5px yellow}
		.pos{
			position: absolute;
			top:20px;
			left:20px;
		}

	</style>
</head>
<body>
	<div id="box1">
		<div class="box2">
			<a href="">
				<img src="images/boy.jpeg" alt="图片挂了再显示" >
			</a>
		</div>
	</div>	
</body>
</html>
<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
<script type="text/javascript">
	// 添加类样式
	$('img').addClass('yj yy pos')
	// 添加css内置样式
	$('img').css({'width':'200','height':'200'})
	$('#box1').addClass('bg')
	$('.box2').addClass('center')
	var res=$('img').attr('alt','替换了没？')
	// 添加title标签
	$('img').attr('title','名字出来')
	// 查看高度，宽度
	var res=$('img').width()
	var res=$('img').height()
	// 查看图片边距
	var res=$('img').offset()
	// 查看相对于父级块的位置
	var res=$('img').position()
	// 去掉class类样式
	$('img').removeClass('pos ')
	$('#box1').removeClass('bg')
	// 取消alt属性
	var res=$('img').removeAttr('alt')

	$('img').attr('data-name','汪汪')
	var res=$('img').attr('data-name')



	console.log(res)

</script>

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Correction status：qualified

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