伪类选择器
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伪类选择器
CSS伪类(Pseudo-class)用于向某些选择器添加特殊的效果。
使用伪类选择器的语法如下： selector:pseudo-class {property:value;} 常用的CSS伪类见表3-1。书写时尽量不要颠倒
下面的代码给出了伪类用于超链接的显式效果，在不同的状态下超链接的颜色不同。 这是一个由伪类装饰的超链接
与伪类相似，伪元素(Pseudo element)也用于向某些选择器添加特殊的效果。常用的CSS伪元素见表3-2。
nth-child(n),，匹配属于其父元素的第N个子元素，不论元素的类型even 偶数 odd奇数
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