伪元素几种用法-前端ABC

<!DOCTYPE html>
<html>
<head lang="en">
	<meta charset="UTF-8">
	<title>伪元素</title>
</head>
<body>
<style>
	.trangle {
		content: " ";
		width: 0;
		height: 0;
		border: 10px solid transparent;
		border-top-color: #333;
	}
</style>
<h3>三角形下拉箭头</h3>
<div class="trangle"></div>
<style>
	.dialog {
		position: relative;
		width: 150px;
		height: 36px;
		border: black 1px solid;
		border-radius: 5px;
		background: rgba(245, 245, 245, 1)
	}
	
	.dialog:before, .dialog:after {
		content: "";
		position: absolute;
		top: 8px;
		width: 0;
		height: 0;
		border: 6px transparent solid;
	}
	
	.dialog:before {
		left: -12px;
		border-right-color: rgba(0, 0, 0, 1);
	}
	
	.dialog:after {
		left: -11px;
		border-right-color: rgba(245, 245, 245, 1);
	}
</style>
<h3>对话框的三角形</h3>
<div class="dialog"></div>
<style>
	.mask-box {
		width: 300px;
		height: 200px;
		margin-top: 20px;
		padding: 20px;
		background: url(http://sjbz.fd.zol-img.com.cn/t_s320x510c/g5/M00/00/04/ChMkJ1fJWJyIQQ3LAAZwxw7cwswAAU-KQJ6sCQABnDf642.jpg) #FB5E23;
	}
	
	.mask-box .mask {
		position: relative;
		width: 100%;
		height: 100%;
	}
	
	.mask-box .mask:before {
		position: absolute;
		content: "";
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		background: rgba(255, 255, 255, .5);
	}
	
	.mask-box .mask span {
		display: block;
		position: inherit;
		z-index: 1;
		padding-top: 90px;
		text-align: center;
		font-weight: 900;
	}
</style>
<h3>遮罩层</h3>
<div class="mask-box">
	<div class="mask">
		<span>遮罩层效果</span>
	</div>
</div>
<style>
	.effect {
		position: relative;
		display: inline-block;
		margin-left: 30px;
		padding: 10px;
		font-size: 30px;
	}
	
	.effect:hover::before, .effect:hover::after {
		position: absolute;
	}
	
	.effect:hover::before {
		content: "\5B";
		left: -20px;
	}
	
	.effect:hover::after {
		content: "\5D";
		right: -20px;
	}
</style>
<h3>符号-动态效果</h3>
<div class="effect">鼠标悬停看效果</div>
</body>
</html>
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伪元素几种用法

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