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【自学CSS碰到的“坑”】谁才是first-child_html/css_WEB-ITnose

WBOY
WBOYOriginal
2016-06-24 11:36:36813browse

看过CSS伪类选择器之后,心想也就如此嘛,:first-child选择元素的第一个子元素,有什么难的,可一到实践中,还是到处碰壁啊。

 1 <body> 2     <ul class="fruit"> 3         <li>Apple</li> 4         <li>Orange</li> 5         <li>Pear</li> 6         <li>Grape</li> 7     </ul> 8     <div class="content"> 9         <p>I am learning CSS.</p>10         <p>I want to be a programmer.</p>11     </div>12 </body>

设置ul的第一个子元素的背景颜色,我想当然地使用了 ul:first-child{backgroud-color:#ccc;},结果发现整个ul元素都被选中了!

再回头看手册“:first-child选择器用于选取属于其父元素的首个子元素的指定选择器”,针对上述代码,也就是说应该设置成这样:

li:first-child{backgroud-color:#ccc;}或者.fruit>:first-child{backgroud-color:#ccc;}

同理,若想选择

的第一个

元素,应该设置:

p:first-child{backgroud-color:#789;}或者.content>:first-child{backgroud-color:#789;}

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