有人可以解释一下为什么:first-of-type和:last-of-type选择器的行为与下面的代码片段一样吗?
https://codepen.io/anon/pen/jaxQNJ
的HTML
<div class="container">
<h2 data-type data-type-a>A (should be black / is black)</h2>
<h2 data-type data-type-a>A (should be red / is black)</h2>
<h2 data-type data-type-b>B (should be green / is black)</h2>
<h2 data-type data-type-b>B (should be blue / is blue)</h2>
</div>
的CSS
div{
color:black;
font-weight:bold;
}
.container h2[data-type]:last-of-type{
color:blue;
}
.container h2[data-type-a]:last-of-type{
color:red;
}
.container h2[data-type-b]:first-of-type{
color:green;
}
:last-of-type
并按:first-of-type
预期工作:
:last-of-type CSS伪类表示一组同级元素中该类型的最后一个元素。
https://developer.mozilla.org/zh-CN/docs/Web/CSS/:last-of-type
问题在于此特定选择器的目标是type的最后一个元素h2
,而忽略了属性选择器。因为类型是h2
and not data-type
or data-type-a
。
我建议您使用class
,它的意思是:
div {
color: black;
font-weight: bold;
}
.data-type-b {
color: green;
}
.data-type-a {
color: red;
}
.data-type:first-child {
color: inherit;
}
.data-type:last-child {
color: blue;
}
<div class="container">
<h2 class="data-type data-type-a">A (should be black / is black)</h2>
<h2 class="data-type data-type-a">A (should be red / is red)</h2>
<h2 class="data-type data-type-b">B (should be green / is green)</h2>
<h2 class="data-type data-type-b">B (should be blue / is blue)</h2>
</div>
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