学习css伪类:has
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- 2025-08-17 20:03:02

学习抖音: @渡一前端提薪课
首先我们看下:has(selector)是什么匹配包含(相对于 selector 的 :scope)指定选择器的元素。可以认为 selector 的前面有一个看不见的 :scope 伪类。它的强大之处是,可以实现父选择器和前面兄弟选择器的功能。支持所有的 CSS 选择符。
我们举个例子:
css
.box1:has(p) { color: red; } .box1:has(span) { color: blue; } .box1:has(a, div) { color: greenyellow; }html
<body> <div class="box1"> <p>ppp</p> </div> <div class="box1"> <span>span</span> </div> <div class="box1"> <a>有p</a> </div> <div class="box1"> <div>有div</div> </div> </body>结果,.box1:has(p) 就是包含 p 标签的.box1 元素。.box1:has(span)就是包含span的元素,.box1:has(a, div) 就是 包换 a 和包含div的元素
进阶知道这个原理后我们在进阶一下,看看 子的伪类可不可以用。
css
.box1:has(.red:hover) { color: red; } .box1:has(.blue:hover) { color: blue; } .box1:has(.yellow:hover) { color: yellow; }html
<div class="box1"> <div class="red">变红色</div> <div class="blue">变蓝色</div> <div class="yellow">变黄色</div> </div>结果:
基于这个特效 我们做一个案例
案例直接上代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>demo-2</title> <style> * { padding: 0; margin: 0; } .container { width: 400px; height: 400px; border: 2px solid #999; position: absolute; top: 100px; left: 50%; transform: translateX(-50%); display: grid; transition: 0.5s; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: 1fr 1fr 1fr; gap: 5px } .item:nth-of-type(1) { background: red; } .item:nth-of-type(2) { background: rgb(255, 208, 0); } .item:nth-of-type(3) { background: rgb(0, 255, 0); } .item:nth-of-type(4) { background: rgb(166, 255, 0); } .item:nth-of-type(5) { background: rgb(170, 88, 224); } .item:nth-of-type(6) { background: rgba(0, 238, 255, 0.726); } .item:nth-of-type(7) { background: rgb(255, 115, 0); } .item:nth-of-type(8) { background: rgb(86, 75, 241); } .item:nth-of-type(9) { background: rgb(255, 0, 149); } .container:has(.item:nth-of-type(1):hover) { grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 2fr 1fr 1fr; } .container:has(.item:nth-of-type(2):hover) { grid-template-columns: 1fr 2fr 1fr; grid-template-rows: 2fr 1fr 1fr; } .container:has(.item:nth-of-type(3):hover) { grid-template-columns: 1fr 1fr 2fr; grid-template-rows: 2fr 1fr 1fr; } .container:has(.item:nth-of-type(4):hover) { grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 1fr 2fr 1fr; } .container:has(.item:nth-of-type(5):hover) { grid-template-columns: 1fr 2fr 1fr; grid-template-rows: 1fr 2fr 1fr; } .container:has(.item:nth-of-type(6):hover) { grid-template-columns: 1fr 1fr 2fr; grid-template-rows: 1fr 2fr 1fr; } .container:has(.item:nth-of-type(7):hover) { grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 1fr 1fr 2fr; } .container:has(.item:nth-of-type(8):hover) { grid-template-columns: 1fr 2fr 1fr; grid-template-rows: 1fr 1fr 2fr; } .container:has(.item:nth-of-type(9):hover) { grid-template-columns: 1fr 1fr 2fr; grid-template-rows: 1fr 1fr 2fr; } </style> </head> <body> <div class="container"> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> </div> </body> <script> </script> </html>效果:
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