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回复讨论(解决方案)
1,#lis和.liss这两个的效果是一样的，但区别是，#lis比.liss的级别高，也就是id选择器比class的选择器级别高
2. ul li 这个和上面的两个效果是不一样的， 这个的效果是，所有的在ul 下的所有li,都会改变样式
你好 你说id的选择器比class的高 是不是这两个同时存在的时候 就是结果是id选择器的那个吗？
你好 你说id的选择器比class的高 是不是这两个同时存在的时候 就是结果是id选择器的那个吗？
对。就是这样
问下 class怎么用的？class 什么时候用啊？
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