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@@ -0,0 +1,71 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box {
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+ /* overflow: auto; */
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+ /* overflow: hidden; */
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+ }
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+ .one {
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+ width: 200px;
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+ height: 200px;
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+ background: #00f;
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+ float: left;
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+ }
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+ .two {
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+ width: 200px;
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+ height: 200px;
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+ background: #f0f;
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+ float: left;
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+ }
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+ .three {
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+ width: 200px;
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+ height: 200px;
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+ background: #0ff;
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+ float: left;
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+ }
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+ .four {
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+ width: 200px;
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+ height: 200px;
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+ background: #0f0;
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+ float: left;
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+ }
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+ .five {
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+ clear: right;
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+ }
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+ /* .clearfix::after {
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+ content: "";
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+ display: block;
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+ clear: both;
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+ } */
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+ </style>
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+</head>
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+<body>
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+ <!--
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+ 浮动导致的问题？
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+ 使用浮动标签的父元素的高度塌陷
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+ 清浮动：
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+ 1.溢出隐藏法
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+ 在塌陷的父元素上添加overflow：hidden/auto属性
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+ 2.伪元素清浮动
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+ .clearfix::after {
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+ content: "";
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+ display: block;
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+ clear: both;
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+ }
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+ 将 属性名添加到高度塌陷的父级盒子上
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+ 3.额外标签法
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+ 在浮动的同级添加一个空盒子 然后给这个盒子一个样式clear:both/left/right/none
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+ -->
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+ <div class="box">
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+ <div class="one"></div>
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+ <div class="two"></div>
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+ <div class="three"></div>
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+ <div class="four"></div>
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+ <div class="five"></div>
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+ </div>
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+</body>
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+</html>
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