lovecoding
/
W250913


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071
							<!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>
        /* 块元素如果不设置宽度 会默认占满父元素的宽度 */
        /* 块元素如果不设置高度 会根据内容撑开 */
        .box{
            border:1px solid black;
            margin-bottom: 20px;
        }
        .item1{
            background-color: blue;

            float: left;
        }
        /* 清除浮动 工具类 */
        .clearfix::after{
            content: "";
            display: block;
            clear: both;
        }
        .item2{
            background-color: red;
            float: right;
        }
        .item{
            width: 100px;
            height: 100px;
            color: white;
            font-size: 50px;
            font-weight: bold;
            margin:10px;
            text-align: center;
            line-height: 100px;
        }
        .item3{
            background-color: green;
            float: left;
        }
        .item4{
            background-color: orange;
            margin:10px auto;
        }
        .item5{
            background-color: green;
            float: right;
        }
    </style>
</head>
<body>
    <!-- 一个标签中可以写多个类名 -->
    <div class="box clearfix">
        <div class="item1 item">1</div>
        <div class="item1 item">2</div>
        <div class="item1 item">3</div>
    </div>
    <div class="box clearfix">
        <div class="item2 item">1</div>
        <div class="item2 item">2</div>
        <div class="item2 item">3</div>
    </div>
    <div class="box">
        <div class="item3 item">左</div>
        <div class="item5 item">右</div>
        <div class="item4 item">中</div>
    </div>
</body>
</html>