html - CSS flexbox |在移动设备中重新排序元素

Question

我正在尝试学习 CSS Flexbox，但发现了一个障碍。

我有在桌面屏幕尺寸上向右和向左显示的内容，对于移动设备，我有 flex-direction: column

见下图:

桌面:

手机:

这是实现这样的代码:

 <div class="container">
    <div class="box box1">
      <div class="a">a</div>
      <div class="b">b</div>
    </div>
    <div class="box box2">
       <div class="c">c</div>
      <div class="d">d</div>
    </div>
  </div>

这些是 flexbox 样式:

.box {
  color: white;
  font-size: 100px;
  text-align: center;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
  padding: 10px;
  width: 100vw;
}

.container {
  display: flex;
  height: 100vh;
}

.a, .b, .c, .d {
  height: 50%;
}

@media all and (max-width: 500px) {
  .container {
    flex-direction: column;
  }
  
  .box {
     height: 50vh;
  }
}

在移动设备中，我如何才能让以下 div 显示在列中(按原样)但是按以下顺序:

一个

c

d

b

不幸的是，我似乎找不到解决方案。

我有一个 CodePen here重要的 CSS 行从第 162 行开始。

Answer 1

您可以考虑在 .box 元素上使用 display:contents ( https://caniuse.com/#feat=css-display-contents )，然后您将能够在内部元素上使用顺序:

.box {
  color: white;
  font-size: 80px;
  text-align: center;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
  padding: 10px;
  width: 100vw;
}
body {
 margin:0;
}
.container {
  display: flex;
  height: 100vh;
  background:blue;
}

.a,.b,.c,.d {
  height: 50%;
  border:2px solid;
}

@media all and (max-width: 500px) {
  .container {
    flex-direction: column;
  }
  .box {
    display:contents;
  }
  .b {
    order:2;
  }
}

<div class="container">
  <div class="box box1">
    <div class="a">a</div>
    <div class="b">b</div>
  </div>
  <div class="box box2">
    <div class="c">c</div>
    <div class="d">d</div>
  </div>
</div>

display: contents causes an element's children to appear as if they were direct children of the element's parent, ignoring the element itself. This can be useful when a wrapper element should be ignored when using CSS grid or similar layout techniques.

---

如果你愿意改变 html，你可以像下面那样做:

.container > * {
  color: white;
  font-size: 80px;
  text-align: center;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
  padding: 10px;
  border:2px solid;
  box-sizing:border-box;
}
body {
 margin:0;
}
.container {
  display: flex;
  flex-direction:column;
  flex-wrap:wrap;
  height: 100vh;
  background:blue;
  padding:10px;
  box-sizing:border-box;
}

.a,.b,.c,.d {
  height: 50%;
  width:50%;
}

@media all and (max-width: 500px) {
  .a,.b,.c,.d {
    width:100%;
    height:25%;
  }
  .b {
    order:2;
  }
}

<div class="container">
    <div class="a">a</div>
    <div class="b">b</div>
    <div class="c">c</div>
    <div class="d">d</div>
</div>

还有 CSS 网格:

.container > * {
  color: white;
  font-size: 80px;
  text-align: center;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.1);
  padding: 10px;
  box-sizing:border-box;
  border:2px solid;
}
body {
 margin:0;
}
.container {
  display: grid;
  grid-template-areas:  
    'a b'
    'c d';
  grid-template-columns:1fr 1fr;
  grid-template-rows:1fr 1fr;
  grid-gap:10px;
  min-height: 100vh;
  background:blue;
  padding:10px;
  box-sizing:border-box;
}

.a {
  grid-area:a;
}
.b {
  grid-area:b;
}
.c {
  grid-area:c;
}
.d {
  grid-area:d;
}

@media all and (max-width: 500px) {
  .container {
   grid-template-areas:  
    'a'
    'c' 
    'd'
    'b';
  grid-template-columns:1fr;
  grid-template-rows:1fr 1fr 1fr 1fr;
   }
}

<div class="container">
    <div class="a">a</div>
    <div class="b">b</div>
    <div class="c">c</div>
    <div class="d">d</div>
</div>