lovecoding
/
W0407


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114
							<!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>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        #box {
            /* height: 400px; */
            /* 溢出隐藏 */
            /* overflow: auto; */
        }
        #box div {
            /* margin-top: 10px; */
            /* float: left; */
            /* margin-left: 10px; */
        }

        #box1 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: red;
        }

        #box2 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: rgb(0, 255, 217);
        }

        #box3 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: rgb(225, 255, 0);
        }

        #box4 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: #00f;
        }

        #box5 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: #0f0;
        }

        #box6 {
            
            width: 200px;
            height: 200px;
            float: left;
            background: rgb(255, 0, 212);
        }
        #empty {
            clear: both;
        }
        .clearfix::after {
            content: "";
            display: block;
            clear: both;
        }
    </style>
</head>

<body>
     <!--
        浮动导致的问题？
            使用浮动标签的父元素的高度塌陷
        清浮动：
            1.溢出隐藏法
                在塌陷的父元素上添加overflow：hidden/auto属性
            2.伪元素清浮动
                .clearfix::after {
                    content: "";
                    display: block;
                    clear: both;
                }
                将 属性名添加到高度塌陷的父级盒子上
            3.额外标签法 
                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
     -->
    <div>
        <div id="box" class="clearfix">
            <div id="box1"></div>
            <div id="box2"></div>
            <div id="box3"></div>
            <div id="box4"></div>
            <div id="box5"></div>
            <div id="box6"></div>
            <!-- <div id="empty"></div> -->
        </div>
        <h1>你好</h1>
    </div>
</body>

</html>