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Wscats opened this issue Jul 11, 2016 · 5 comments
Closed

CSS Flex布局 #41

Wscats opened this issue Jul 11, 2016 · 5 comments
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@Wscats
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Wscats commented Jul 11, 2016 •
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样式如下
用flex和百分比同样做响应式布局，效果一样，但是方法不一样
传统布局方法一般是基于盒状模型的，通过display属性,position属性和float属性达到目的。它这对于那些特殊布局非常不方便，比如，垂直居中就不容易实现。

这里header相当于一个flex的盒模型，里面的div根据这个盒做相应的改变

body {
            margin: 0;
            padding: 0;
        }

        /*flex方法*/
        .header {
            display: flex;
            /*设为Flex布局以后，子元素的float、clear和vertical-align属性将失效。*/
            flex-direction: row;
            background-color: #c5c5c5;
            width: 100%;
        }

        .header div {
            text-align: center;
            flex: 1;
        }
        /*百分比方法*/
        .headerPer{
            background-color: #c5c5c5;
            width: 100%;
            float: left;
        }

        .headerPer div{
            float: left;
            width: 25%;
            text-align: center;
        }

    </style>

    <body>
        <header class="header">
            <div>左边</div>
            <div>中间</div>
            <div>中间</div>
            <div>右边</div>
        </header>

        <header class="headerPer">
            <div>左边</div>
            <div>中间</div>
            <div>中间</div>
            <div>右边</div>
        </header>
    </body>

上面flex属性用于设置或检索弹性盒模型对象的子元素如何分配空间。比如上面就把每个div分成四个1，每个占四份之一

flex设置为1就是默认设置flex-grow，flex-shrink和flex-basis属性值

  • flex-grow 一个数字，规定项目将相对于其他灵活的项目进行扩展的量。
  • flex-shrink 一个数字，规定项目将相对于其他灵活的项目进行收缩的量。
  • flex-basis 项目的长度。合法值："auto"、"inherit" 或一个后跟 "%"、"px"、"em" 或任何其他长度单位的数字。

flex-basis属性用于设置或检索弹性盒伸缩基准值
注意：如果元素不是弹性盒对象的元素，则 flex-basis 属性不起作用
如果用JS写的话就用这种

<script> var divs = document.getElementsByTagName("div"); console.log(divs); divs[2].style.flexBasis="200px"; </script>

注意：display: box; 是 2009版本. display: flex;是2011修订版
@Wscats
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Wscats commented Jul 11, 2016

Flex是Flexible Box的缩写，意为"弹性布局"，用来为盒状模型提供最大的灵活性。
任何一个容器都可以指定为Flex布局。

.box{
  display: flex;
}

行内元素也可以使用Flex布局。

.box{
  display: inline-flex;
}

@Wscats
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Wscats commented Jul 11, 2016 •
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我们可以对header盒子增加一个
flex-direction: row-reverse;
他可以有以下的值

  • row（默认值）：主轴为水平方向，起点在左端。
  • row-reverse：主轴为水平方向，起点在右端。
  • column：主轴为垂直方向，起点在上沿。
  • column-reverse：主轴为垂直方向，起点在下沿。

flex-direction:initial;设置默认值为row
flex-direction:inherit;从父元素继承该属性

@Wscats
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Wscats commented Jul 14, 2016 •
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参考：Flex 布局教程：实例篇
参考：Wsscat的例子

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <style>
        section {
            display: flex;
            width: 120px;
            height: 120px;
            background-color: antiquewhite;
        }
        section span:nth-of-type(1) {
            border-radius: 10px;
            display: block;
            width: 32px;
            height: 32px;
            margin: 4px;
            background-color: black;
            align-self:center;
        }

        section span:nth-of-type(2) {
            border-radius: 10px;
            display: block;
            width: 32px;
            height: 32px;
            margin: 4px;
            background-color: black;
            align-self:center;
        }
    </style>

    <body>
        <section>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </section>
    </body>
</html>

@Wscats
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Wscats commented Jul 14, 2016

写了个比较全的DEMO

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0,user-scalable=no">
        <title>Wsscat的flex布局DEMO</title>
    </head>
    <style>
        /*display: box; 是 2009版本. display: flex;是2011修订版*/
        /*初始化*/

        * {
            margin: 0;
            padding: 0;
        }
        /*设置了box属性 321*/

        .article1 {
            width: 600px;
            height: 200px;
            display: -moz-box;
            display: -webkit-box;
            display: box;
        }

        .sectionOne {
            background: orange;
            -moz-box-flex: 3;
            -webkit-box-flex: 3;
            box-flex: 3;
        }

        .sectionTwo {
            background: purple;
            -moz-box-flex: 2;
            -webkit-box-flex: 2;
            box-flex: 2;
        }

        .sectionThree {
            -moz-box-flex: 1;
            -webkit-box-flex: 1;
            box-flex: 1;
            background: green;
        }
        /*不设置flex属性*/

        .article2 section:nth-of-type(1) {
            background: orange;
            /*因为父元素没有设置 display: box;属性，所以不生效
             在这里就白白设置了
             * */
            -moz-box-flex: 2;
            -webkit-box-flex: 2;
            box-flex: 2;
        }

        .article2 section:nth-of-type(2) {
            background: purple;
        }

        .article2 section:nth-of-type(3) {
            background: green;
        }
        /*设置的flex属性 321*/

        .article3 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
        }

        .article3 section:nth-of-type(1) {
            background: orange;
            flex: 3;
        }

        .article3 section:nth-of-type(2) {
            background: purple;
            flex: 2;
        }

        .article3 section:nth-of-type(3) {
            background: green;
            flex: 1;
        }
        /*用百分比*/

        .article4 {
            width: 600px;
            height: 200px;
            float: left;
        }

        .article4 section:nth-of-type(1) {
            height: 200px;
            background: orange;
            /*3:6*/
            width: 50%;
            float: left;
        }

        .article4 section:nth-of-type(2) {
            height: 200px;
            background: purple;
            /*2:6*/
            width: 33.3%;
            float: left;
        }

        .article4 section:nth-of-type(3) {
            height: 200px;
            background: green;
            /*1:6*/
            width: 16.6%;
            float: left;
        }

        .article5 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
        }

        .article5 section:nth-of-type(1) {
            background: orange;
            width: 50%;
            /*变成了42.9%*/
        }

        .article5 section:nth-of-type(2) {
            background: purple;
            width: 33.3%;
            /*变成了28.56*/
        }

        .article5 section:nth-of-type(3) {
            background: green;
            width: 33.3%;
            /*变成了28.56*/
            /*超出了16.6%*/
            /*然后对超出的这16.6做一个分配;*/
            /*16.6*(50%/116%) = 7.1;*/
            /*16.6*(33.3%/116%) = 4.74;*/
        }

        .article6 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-direction: row-reverse;
        }

        .article6 section:nth-of-type(1) {
            background: orange;
            flex: 3;
        }

        .article6 section:nth-of-type(2) {
            background: purple;
            flex: 2;
        }

        .article6 section:nth-of-type(3) {
            background: green;
            flex: 1;
        }

        .article7 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-direction: column;
        }

        .article7 section:nth-of-type(1) {
            background: orange;
            flex: 3;
        }

        .article7 section:nth-of-type(2) {
            background: purple;
            flex: 2;
        }

        .article7 section:nth-of-type(3) {
            background: green;
            flex: 1;
        }

        .article8 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-direction: column-reverse;
        }

        .article8 section:nth-of-type(1) {
            background: orange;
            flex: 3;
        }

        .article8 section:nth-of-type(2) {
            background: purple;
            flex: 2;
        }

        .article8 section:nth-of-type(3) {
            background: green;
            flex: 1;
        }

        .article9 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-wrap: wrap;
        }

        .article9 section:nth-of-type(1) {
            background: orange;
            width: 300px;
        }

        .article9 section:nth-of-type(2) {
            background: purple;
            width: 200px;
        }

        .article9 section:nth-of-type(3) {
            background: green;
            width: 200px;
        }

        .article10 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-wrap: wrap-reverse;
        }

        .article10 section:nth-of-type(1) {
            background: orange;
            width: 300px;
        }

        .article10 section:nth-of-type(2) {
            background: purple;
            width: 200px;
        }

        .article10 section:nth-of-type(3) {
            background: green;
            width: 200px;
        }

        .article11 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-flow: column wrap-reverse;
        }

        .article11 section:nth-of-type(1) {
            background: orange;
            flex: 3;
        }

        .article11 section:nth-of-type(2) {
            background: purple;
            flex: 2;
        }

        .article11 section:nth-of-type(3) {
            background: green;
            flex: 1;
        }

        .article12 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            justify-content: flex-end;
        }

        .article12 section:nth-of-type(1) {
            background: orange;
            width: 100px;
        }

        .article12 section:nth-of-type(2) {
            background: purple;
            width: 100px;
        }

        .article12 section:nth-of-type(3) {
            background: green;
            width: 100px;
        }

        .article13 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            justify-content: center;
        }

        .article13 section:nth-of-type(1) {
            background: orange;
            width: 100px;
        }

        .article13 section:nth-of-type(2) {
            background: purple;
            width: 100px;
        }

        .article13 section:nth-of-type(3) {
            background: green;
            width: 100px;
        }

        .article14 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            justify-content: space-between;
        }

        .article14 section:nth-of-type(1) {
            background: orange;
            width: 100px;
        }

        .article14 section:nth-of-type(2) {
            background: purple;
            width: 100px;
        }

        .article14 section:nth-of-type(3) {
            background: green;
            width: 100px;
        }

        .article15 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            justify-content: space-around;
        }

        .article15 section:nth-of-type(1) {
            background: orange;
            width: 100px;
        }

        .article15 section:nth-of-type(2) {
            background: purple;
            width: 100px;
        }

        .article15 section:nth-of-type(3) {
            background: green;
            width: 100px;
        }

        .article16 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            flex-wrap: wrap;
            align-content: center;
            background-color: #D7D7D7;
        }

        .article16 section:nth-of-type(1) {
            background: orange;
            width: 300px;
            height: 50px;
        }

        .article16 section:nth-of-type(2) {
            background: purple;
            width: 200px;
            height: 50px;
        }

        .article16 section:nth-of-type(3) {
            background: green;
            width: 200px;
            height: 50px;
        }

        .article17 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            align-items:flex-end;
            background-color: #D7D7D7;
        }

        .article17 section:nth-of-type(1) {
            background: orange;
            width: 300px;
            height: 50px;
        }

        .article17 section:nth-of-type(2) {
            background: purple;
            width: 200px;
            height: 50px;
        }

        .article17 section:nth-of-type(3) {
            background: green;
            width: 100px;
            height: 50px;
        }

        .article18 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            align-items:center;
            background-color: #D7D7D7;
        }

        .article18 section:nth-of-type(1) {
            background: orange;
            width: 300px;
            height: 50px;
        }

        .article18 section:nth-of-type(2) {
            background: purple;
            width: 200px;
            height: 50px;
        }

        .article18 section:nth-of-type(3) {
            background: green;
            width: 100px;
            height: 50px;
        }

        .article19 {
            width: 600px;
            height: 200px;
            display: -moz-flex;
            display: -webkit-flex;
            display: flex;
            background-color: #D7D7D7;
        }

        .article19 section:nth-of-type(1) {
            background: orange;
            width: 300px;
            height: 50px;
            align-self:center;
        }

        .article19 section:nth-of-type(2) {
            background: purple;
            width: 200px;
            height: 50px;
            align-self:flex-end;
        }

        .article19 section:nth-of-type(3) {
            background: green;
            width: 100px;
            height: 50px;
            align-self:flex-start;
        }
    </style>

    <body>
        <!--设置display: box;-->
        <p>设置display: box</p>
        <article class="article1">
            <section class="sectionOne">1</section>
            <section class="sectionTwo">2</section>
            <section class="sectionThree">3</section>
        </article>

        <!--不设置 display: box;-->
        <p>不设置 display: box;</p>
        <article class="article2">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <!--设置display: flex;-->
        <p>设置display: flex;</p>
        <article class="article3">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <!--用百分比-->
        <p>用百分比</p>
        <p>细心的会发现我们右边还有大概0.01%的宽度没有填充（由于是100不能完全等分三分），这就是使用百分比不好的一种表现</p>
        <article class="article4">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <!--用百分比结合flex-->
        <p style="float: left;">用百分比结合flex(溢出情况)</p>
        <p>事实上这里可以不对父元素写display:flex</p>
        <article class="article5">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;它默认是flex-direction:row，现在设置成flex-direction:row-reverse</p>
        <article class="article6">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;它默认是flex-direction:row，现在设置成flex-direction:column</p>
        <article class="article7">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;它默认是flex-direction:row，现在设置成flex-direction:column-reverse</p>
        <article class="article8">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;固定值溢出的情况;它默认是flex-wrap:nowrap，现在设置成wrap</p>
        <article class="article9">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;固定值溢出的情况;它默认是flex-wrap:nowrap，现在设置成wrap-reverse</p>
        <article class="article10">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;固定值溢出的情况;它默认是flex-flow:row nowrap，其实就是flex-direction和flex-wrap合并在一起写，现在设置成colum wrap-reverse</p>
        <article class="article11">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;不溢出的情况;它默认是justify-content:flex-start,现在设置成justify-content:flex-end</p>
        <article class="article12">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;不溢出的情况;它默认是justify-content:flex-start,现在设置成justify-content:center</p>
        <article class="article13">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;不溢出的情况;它默认是justify-content:flex-start,现在设置成justify-content:space-between</p>
        <article class="article14">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;不溢出的情况;它默认是justify-content:flex-start,现在设置成justify-content:space-around</p>
        <article class="article15">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;宽度溢出的情况;高度不溢出并上下有空余部分;它默认是align-content:flex-start,现在设置成align-content:flex-start;注意：这属性在只有一行的伸缩容器上没有效果</p>
        <article class="article16">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;宽度不溢出的情况;高度不溢出并上下有空余部分;它默认是align-items:flex-start,现在设置成align-items:flex-end;注意：这属性在一行的伸缩容器上是有效果的</p>
        <article class="article17">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>设置display: flex;宽度不溢出的情况;高度不溢出并上下有空余部分;它默认是align-items:flex-start,现在设置成align-items:center;注意：这属性在一行的伸缩容器上是有效果的</p>
        <article class="article18">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>

        <p>定义flex子项单独在侧轴（纵轴）方向上的对齐方式,意思就是之前我们定义的位置都是针对父元素article来写定位样式，但align-self却可以对子元素section进行单独的定位</p>
        <article class="article19">
            <section>1</section>
            <section>2</section>
            <section>3</section>
        </article>
    </body>

</html>

@Wscats Wscats added the notes label Jul 14, 2016
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Wscats commented Jul 16, 2016 •
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参考：Wsscat的例子

@Wscats Wscats closed this as completed Aug 22, 2019
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