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:first-of-type
V1.9概述
结构化伪类，匹配E的父元素的第一个E类型的孩子。等价于 :nth-of-type(1) 选择器。
解释的很模糊，网上搜了很多都是扯淡的解释，作者也只能自己一个个试，试了几十次才弄的稍微有点清楚，如果错了，慢点拍砖，怕怕。直接看示例。
描述:
查找作为父元素的span类型子元素中的"长子"的span标签
HTML 代码:
<div id="n1"> <div id="n2" class="abc"> <label id="n3">label1</label> <span id="n4">span1</span> <span id="n5" class="abc">span2</span> <span id="n6">span3</span> </div> <div id="n7"> <span id="n8" class="abc">span1</span> <span id="n9">span2</span> </div> </div>
jQuery 代码:
$("span:first-of-type");结果:
//n4虽然不是n2的第一个子元素，但它是n2所有span类型子元素中的第一个，因此可以匹配 [<span id="n4">span1</span>,<span id="n8" class="abc">span1</span>]
HTML 代码:
<div id="n1"> <div id="n2" class="abc"> <label id="n3">label1</label> <span id="n4">span1</span> <span id="n5" class="abc">span2</span> <span id="n6">span3</span> </div> <div id="n7"> <span id="n8" class="abc">span1</span> <span id="n9">span2</span> </div> </div>
jQuery 代码:
$(".abc:first-of-type");结果:
//.abc可以匹配id分别为n2、n5、n8的3个元素，n2是n1所有div类型子元素中的第一个，n8是n7所有span类型子元素中的第一个，但n5不是n2所有span类型子元素中的第一个，因此不能匹配n5。 [<div id="n2" class="abc">,<span id="n8" class="abc">span1</span>]