同窗们遇到过给同一组元素的最后一个元素设置css失效的状况吗?我遇到过,当时使用:last-child竟然不起做用,看到名字不科学啊,明明是“最后一个元素”,那为何设置CSS失效呢?今天来一探究竟吧css
:last-child
正常工做的代码<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>:last-child、:last-of-type</title> <script src="../../lib/jquery-2.1.0.js"></script> <style> ul { margin: 100px 0; } li { list-style: circle; border-bottom: 1px solid #000000; } li:last-child { border-color: red; } </style> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <!--<p>我是来骚扰的</p>--> </ul> </body> </html>
:last-child
不正常工做的代码<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>:last-child、:last-of-type</title> <script src="../../lib/jquery-2.1.0.js"></script> <style> ul { margin: 100px 0; } li { list-style: circle; border-bottom: 1px solid #000000; } li:last-child { border-color: red; } </style> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <p>我是来骚扰的</p> </ul> </body> </html>
问题抛出来了,那么来研究下:last-child和:last-of-type到底是何方神圣。html
:last-child:The last-child CSS pseudo-class represents the last element among a group of sibling elements.(:last-child这个css伪类表明的一组兄弟元素当中最后一个元素)但通过代码发现,它说的一组元素应该是指其父元素的全部子元素且类型为:last-child前面指定的类型的一组元素。jquery
:last-of-type:The last-of-type CSS pseudo-class represents the last element of its type among a group of sibling elements.(:last-of-type这个css伪类表明其类型的一组兄弟元素中的最后一个元素**)因此它指的是和**:last-of-type前面的元素类型一致的一组元素的最后一个元素code
同理::nth-last-child和:nth-last-of-type的区别在于父元素的子元素中且与:nth-last-child前面的元素类型一致的最后一个元素htm
作个验证ip
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>:last-child、:last-of-type</title> <script src="../../lib/jquery-2.1.0.js"></script> <style> ul { margin: 100px 0; } li { list-style: circle; border-bottom: 1px solid #000000; } li:nth-last-child(1){ border-color: red; } </style> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <!--<p>我是来骚扰的</p>--> </ul> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>:last-child、:last-of-type</title> <script src="../../lib/jquery-2.1.0.js"></script> <style> ul { margin: 100px 0; } li { list-style: circle; border-bottom: 1px solid #000000; } li:nth-last-child(1){ border-color: red; } </style> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <p>我是来骚扰的</p> </ul> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>:last-child、:last-of-type</title> <script src="../../lib/jquery-2.1.0.js"></script> <style> ul { margin: 100px 0; } li { list-style: circle; border-bottom: 1px solid #000000; } li:nth-last-of-type(1){ border-color: red; } </style> </head> <body> <ul> <li>1</li> <li>2</li> <li>3</li> <p>我是来骚扰的</p> </ul> </body> </html>