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• qq_慕神1420022

  2022-03-31 09:18:18

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  0

• 宝慕林6291606

  2018-11-30 10:19:35

  懂了，给还不明白的人说一下

  <ul class="food">
      <li>水果     //food的第一代子元素
          <ul>    // li下的第一代  可以认为是food的第二代了
  

              <li>香蕉</li>   // ul下的第一代   可以认为food的第三代了
  

              <li>苹果</li>
              <li>梨</li>
          </ul>
      </li> 

  .food>li{}只针对于food的第一代li标签内的内容
  

  
  

  
  

  4