两列三列布局(附代码&图)_flex布局两行三列-优快云博客

本文链接：https://blog.youkuaiyun.com/l_ymttt/article/details/118696872

本文介绍了使用HTML和CSS实现两列和三列布局的三种常见方法：浮动布局、相对绝对定位以及Flexbox布局。详细阐述了每种方法的实现步骤，并提供了布局实现后的效果图。

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两列布局

1：浮动：左边的给宽高，右边的不设宽，用margin-left把左边的宽给留出来

2：相对绝对定位：给父级加position:relative,左边的给宽高并absolute,右边的不设宽，给高度并用margin把left的宽留出来

3：flex：给父级设flex，left给宽高，right设置flex为1，给高

效果图：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>两列布局</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        /* 浮动：*/
        .left {
            width: 150px;
            height: 100px;
            background: rgb(87, 207, 228);
            float: left;
        }
        .right {
            height: 100px;
            margin-left: 150px;
            background: rgb(58, 109, 169);
        }


        /*相对绝对定位*/
        #box {
            position: relative;
            margin-bottom: 20px;
        }
        .left1 {
            position: absolute;
            width: 150px;
            height: 100px;
            background: rgb(87, 207, 228);
        }
        .right1 {
            height: 100px;
            margin-left: 150px;
            background: rgb(58, 109, 169);
        }


        /* flex*/
        #box2 {
            display: flex;
        }
        .left2 {
            width: 150px;
            height: 100px;
            background: rgb(87, 207, 228);
        }
        .right2 {
            flex: 1;
            height: 100px;
            background: rgb(58, 109, 169);
        }
    </style>
</head>

<body>

    <!-- 浮动 -->
    <div class="left">left</div>
    <div class="right">right</div>

    <br>

    <!-- 相对绝对定位 -->
    <div id="box">
        <div class="left1">left11</div>
        <div class="right1">right11</div>
    </div>

    <!-- flex -->
    <div id="box2">
        <div class="left2">left22</div>
        <div class="right2">right22</div>
    </div>
</body>

</html>

三列布局

1.浮动：写div时要把center放在最后面，left和right设置宽高并左右浮动，center给高度，用margin把左右两边的宽留出来就行了

2.绝对布局：写div时要把center放在最后面，left和right给宽高设置absolute，left的left值为0，right的right值为0。center给高度并用margin把left和right的宽留出来

3.flex：要给他们的父级盒子设置为flex，宽度为100%，左右部分都给宽高，center设置flex为1，给高

效果图：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三列布局</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        /* 浮动*/
        .left {
            width: 200px;
            height: 100px;
            background: rgb(253, 157, 191);
            float: left;
        }
        .center {
            height: 100px;
            background: rgb(228, 223, 223);
            margin-left: 200px;
            margin-right: 200px;
        }
        .right {
            width: 200px;
            height: 100px;
            background: rgb(253, 157, 191);
            float: right;
        }

        /* 绝对布局*/
        .second {
            margin-top: 40px;
        }
        .left1 {
            width: 200px;
            height: 100px;
            background: rgb(253, 157, 191);
            position: absolute;
            left: 0;
        }
        .center1 {
            height: 100px;
            background: rgb(228, 223, 223);
            margin-left: 200px;
            margin-right: 200px;
        }
        .right1 {
            width: 200px;
            height: 100px;
            background: rgb(253, 157, 191);
            position: absolute;
            right: 0;
        }

        /* flex*/
        .three {
            width: 100%;
            height: 100px;
            display: flex;
            margin-top: 20px;
        }
        .left2,
        .right2 {
            width: 200px;
            height: 100px;
            background: rgb(253, 157, 191);
        }
        .center2 {
            /* flex属性是flex-grow,flex-shrink,flex-basis的简写，
            默认值为0 1 auto。后两个属性可选。 */
            flex: 1;
            height: 100px;
            background: rgb(228, 223, 223);
        }
    </style>

</head>

<body>
    <div class="first">
        <div class="left">left</div>
        <div class="right">right</div>
        <div class="center">center</div>
    </div>

    <div class="second">
        <div class="left1">left</div>
        <div class="right1">right</div>
        <div class="center1">center</div>
    </div>

    <div class="three">
        <div class="left2">left</div>
        <div class="center2">center</div>
        <div class="right2">right</div>
    </div>

</body>

</html>