标签:css3 code 伪类 -- demo 选择器 child line example
结构性伪类
demo
<div class="parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<div class="line">ccc</div>
<div class="line">ddd</div>
</div>
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:first-child --选择第一个元素
code example .line:first-child {background: #289373;}
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:last-child --选择最后一个元素
code example .line:last-child {background: #ff1133;}
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:nth-child(n) --选择每个元素;:nth-child(n+2) --选择第2个开始的每个元素;
code example .line:nth-child(n+2) {color: #ccc;}
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:empty --选择空元素
demo code example <div class="parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<div class="line">ccc</div>
<div class="line">ddd</div>
<div class="line"></div>
</div>.line:empty{
height: 16px;
background-color: lavender;
}
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:only-child() --匹配属于父元素中
唯一子元素
的.linedemo code example <div class="parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<div class="line">ccc</div>
</div>
<div class="parent">
<div class="line">ddd</div>
</div>.line:only-child{text-decoration: underline;}
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demo
<div class="_parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<span class="line">pccc</span>
<div class="line">ccc</div>
<span class="line">pddd</span>
<div class="line">ddd</div>
</div>
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:nth-of-type(2n) --选择每类(标签)的2n个
code example .line:nth-of-type(2n){border: 1px solid lightgray;}
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:nth-last-of-type(2n) --倒数选择每类(标签)的2n个
code example .line:nth-last-of-type(2n){border-left: 3px solid lightskyblue;}
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:first-of-type --选择每类(标签)的第一个
code example .line:first-of-type{text-decoration: line-through;}
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:only-of-type
demo code example <div class="_parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<span class="line">pccc</span>
<p class="line">33333</p>
</div>.line:only-of-type{color: lightcoral;}
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目标伪类
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:target --相关URL#后面指向的元素
demo code example <div class="artivle">
<div class="nav">
<a class="item1" href="#item1">item1</a>
<a class="item2" href="#item2">item2</a>
</div>
<div class="content">
<div id="item1" class="item">item1111</div>
<div id="item2" class="item">item2222</div>
</div>
</div>.item:target{
background: #000;
color: lightyellow;
}
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否定伪类
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:not() --取反
demo code example <div class="_parent">
<div class="line">aaa</div>
<div class="line">bbb</div>
<span class="line">pccc</span>
<p class="line">33333</p>
</div>.line:not(.line:first-child){color: lightsalmon;}
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UI元素状态伪类
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:hover
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:visited
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:active
demo code example <div class="ui-a">
<a href="#nav1">item1</a>
<a href="#nav2">item2</a>
<a href="#nav3">item3</a>
</div>.ui-a a{text-decoration: none;}
.ui-a a:hover{border-bottom: 1px solid mediumblue;}
.ui-a a:visited{color: green;}
.ui-a a:active{color: red;}
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:enabled
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:disabled
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:checked
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:focus
demo code example <form action="">
<input type="text" disabled><br/>
<input type="text" ><br/>
<input type="checkbox">男
</form>form input:focus{outline-color: red;}
form input:enabled{border: 1px solid blue;}
form input:disabled{background: #ccc;}
form input:checked{outline: 1px solid darkred;}
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::selection
暂时没用过
标签:css3,code,伪类,--,demo,选择器,child,line,example 来源: https://www.cnblogs.com/y-y77/p/15305829.html
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