lovecoding
/
vipAllDay


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      /* .main {
        overflow: auto;
    } */
      #box1 {
        width: 200px;
        height: 200px;
        float: left;
        background-color: aqua;
      }
      #box2 {
        width: 200px;
        height: 200px;
        float: left;
        background-color: rgb(106, 0, 255);
      }
      #box3 {
        width: 200px;
        height: 200px;
        float: left;
        background-color: rgb(255, 111, 0);
      }
      #box4 {
        width: 200px;
        height: 200px;
        float: left;
        background-color: rgb(255, 0, 98);
      }
      /* #box5 {
        clear: both;
      } */
      .clearfix::after {
        content: "";
        display: block;
        clear: both;
      }
    </style>
  </head>
  <body>
    <!-- 
        浮动会导致父元素高度塌陷
        清除浮动办法：
        1.溢出隐藏法
            在父元素上添加overflow:hidden/auto
        2.额外标签法：
            在使用浮动的子集同级添加一个空标签 并给标签添加clear:both/left/right 属性
        3.伪元素清浮动
           在style中添加 .clearfix::after {
                content: "";
                display: block;
                clear: both;
            }
            将clearfix添加到高度塌陷的父元素上
     -->
    <div class="main clearfix">
      <div id="box1">1</div>
      <div id="box2">2</div>
      <div id="box3">3</div>
      <div id="box4">4</div>
      <!-- <div id="box5"></div> -->
    </div>
  </body>
</html>