:last-child与:last-of-type你只是会用,有研究过区别吗?

:last-child与:last-of-type

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

  • 先看一组: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>

效果图1

  • 再先看一组: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>

效果图2

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

  1. :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

  2. :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

  • :nth-last-child能够正常工做的代码
<!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: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>

效果图3

  • :nth-last-child不能正常工做的代码
<!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: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>

效果图2

  • 接下来:nth-last-of-type闪亮登场
<!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>

效果图3

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