布局问题：定高的三栏布局问题（5种方案解决）

问题：假设高度已知，写出三栏布局，其中左栏，右栏各为300px,中间自适应

三栏布局可以用浮动，绝对定位，flexbox布局，表格布局（table-cell），网格布局（grid）实现

1.浮动布局

    <section class="layout float">
        <style>
            .layout article div {
                height: 100px;
            }
            .layout.float .left {
                float: left;
                width: 300px;
                background-color: red;
            }
            .layout.float .right {
                float: right;
                width: 300px;
                background-color: blue;
            }
            .layout.float .center {
                width: auto;
                background-color: yellow;
            }
        </style>
        <article class="left-right-center">
            <div class="left"></div>
            <div class="right"></div>
            <div class="center">
                浮动解决方案
            </div>
        </article>
    </section>

2.绝对定位

    <section class="layout absolute">
        <style>
            .layout article div {
                height: 100px;
            }
            .layout.absolute .left-right-center>div {
                position: absolute;
            }
            .layout.absolute .left {
                left: 0;
                width: 300px;
                background-color: red;
            }
            .layout.absolute .center {
                left: 300px;
                right: 300px;
                background-color: yellow;
            }
            .layout.absolute .right {
                right: 0;
                width: 300px;
                background-color: blue;
            }
        </style>
        <article class="left-right-center">
            <div class="left"></div>
            <div class="right"></div>
            <div class="center">
                绝对定位解决方案
            </div>
        </article>
    </section>

3.flexbox布局实现

    <section class="layout flexbox">
        <style>
            .layout article div {
                height: 100px;
            }
            .layout.flexbox {
                margin-top: 120px;
            }
            .layout.flexbox .left-center-right {
                display: flex;
            }
            .layout.flexbox .left {
                width: 300px;
                background-color: red;
            }
            .layout.flexbox .center {
                flex: 1;
                background-color: yellow;
            }
            .layout.flexbox .right {
                width: 300px;
                background-color: blue;
                ;
            }
        </style>
        <article class="left-center-right">
            <div class="left"></div>
            <div class="center">flexbox解决方法</div>
            <div class="right"></div>
        </article>
    </section>

4.表格布局（table-cell）

    <section class="layout table">
        <style>
            .layout article div {
                height: 100px;
            }
            .layout.table .left-center-right {
                width: 100%;
                display: table;
                height: 100px;
            }
            .layout.table .left-center-right>div {
                display: table-cell;
            }
            .layout.table .left {
                width: 300px;
                background-color: red;
            }
            .layout.table .center {
                background-color: yellow;
            }
            .layout.table .right {
                background-color: blue;
                width: 300px;
            }
        </style>
        <article class="left-center-right">
            <div class="left"></div>
            <div class="center">表格布局table实现</div>
            <div class="right"></div>
        </article>
    </section>

5.网格布局

    <section class="layout grid">
        <style>
            .layout article div {
                height: 100px;
            }
            .layout.grid .left-center-right {
                display: grid;
                width: 100%;
                grid-template-rows: 100px;
                grid-template-columns: 300px auto 300px;
            }
            .layout.grid .left {
                background-color: red;
            }
            .layout.grid .center {
                background-color: yellow;
            }
            .layout.grid .right {
                background-color: blue;
            }
        </style>
        <article class="left-center-right">
            <div class="left"></div>
            <div class="center">网格布局实现</div>
            <div class="right"></div>
        </article>
    </section>

效果是