如何将两个 div 并排放置？

Question

考虑following code：

#wrapper {
    width: 500px;
    border: 1px solid black;
}
#first {
    width: 300px;
    border: 1px solid red;
}
#second {
    border: 1px solid green;
}

<div id="wrapper">
    <div id="first">Stack Overflow is for professional and enthusiast programmers, people who write code because they love it.</div>
    <div id="second">When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, so be sure to check back frequently when your question is still new for the best response.</div>
</div>

我希望两个 div 在包装 div 内彼此相邻。在这种情况下，绿色 div 的高度应该决定 wrapper 的高度。

如何通过 CSS 实现这一点？

Answer 1

浮动一个或两个内部 div。

浮动一个 div：

#wrapper {
    width: 500px;
    border: 1px solid black;
    overflow: hidden; /* will contain if #first is longer than #second */
}
#first {
    width: 300px;
    float:left; /* add this */
    border: 1px solid red;
}
#second {
    border: 1px solid green;
    overflow: hidden; /* if you don't want #second to wrap below #first */
}

或者如果你同时浮动，你需要鼓励包装器 div 包含浮动的孩子，否则它会认为它是空的并且没有在它们周围放置边框

浮动两个 div：

#wrapper {
    width: 500px;
    border: 1px solid black;
    overflow: hidden; /* add this to contain floated children */
}
#first {
    width: 300px;
    float:left; /* add this */
    border: 1px solid red;
}
#second {
    border: 1px solid green;
    float: left; /* add this */
}

Answer 2

有两个 div，你也可以使用display 属性：

#wrapper {
    border: 1px solid blue;
}
#div1 {
    display: inline-block;
    width:120px;
    height:120px;
    border: 1px solid red;
}
#div2 {
    display: inline-block;
    width:160px;
    height:160px;
    border: 1px solid green;
}

<div id="wrapper">
    <div id="div1">The two divs are</div>
    <div id="div2">next to each other.</div>
</div>

如果div1 超过一定高度，div2 将被放置在底部div1 旁边。要解决此问题，请在 div2 上使用 vertical-align:top;。

#wrapper {
    border: 1px solid blue;
}
#div1 {
    display: inline-block;
    width:120px;
    height:120px;
    border: 1px solid red;
}
#div2 {
    vertical-align:top;
    display: inline-block;
    width:160px;
    height:160px;
    border: 1px solid green;
}

<div id="wrapper">
    <div id="div1">The two divs are<br/><br/><br/><br/><br/><br/></div>
    <div id="div2">next to each other.</div>
</div>

jsFiddle for example 1.

jsFiddle for example 2.

Answer 3

您可以使用 CSS 浮动属性让元素彼此相邻：

#first {
float: left;
}
#second {
float: left;
}

您需要确保包装器 div 允许在宽度方面进行浮动，并且边距等设置正确。

Answer 4

尝试使用弹性盒模型。写起来简单又简短。

直播Jsfiddle

CSS：

#wrapper {
  display: flex;
  border: 1px solid black;
}
#first {
    border: 1px solid red;
}
#second {
    border: 1px solid green;
}

默认方向是行。因此，它在#wrapper 内彼此相邻对齐。 但不支持IE9及以下版本

Answer 5

选项 1

在两个 div 元素上使用 float:left，并为两个 div 元素设置一个 % 宽度，总宽度为 100%。

在浮动 div 元素上使用 box-sizing: border-box;。值border-box 强制填充和边框进入宽度和高度，而不是扩展它。

在<div id="wrapper"> 上使用 clearfix 清除浮动的子元素，这将使包装器 div 缩放到正确的高度。

.clearfix:after {
   content: " "; 
   visibility: hidden;
   display: block;
   height: 0;
   clear: both;
}

#first, #second{
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

#wrapper {
    width: 500px;
    border: 1px solid black;
}
#first {
    border: 1px solid red;
    float:left;
    width:50%;
}
#second {
    border: 1px solid green;
    float:left;
    width:50%;
}

http://jsfiddle.net/dqC8t/3381/

选项 2

在一个元素上使用position:absolute，在另一个元素上使用固定宽度。

添加 position:relative to <div id="wrapper"> 元素以使子元素绝对定位到 <div id="wrapper"> 元素。

#wrapper {
    width: 500px;
    border: 1px solid black;
    position:relative;
}
#first {
    border: 1px solid red;
    width:100px;
}
#second {
    border: 1px solid green;
    position:absolute;
    top:0;
    left:100px;
    right:0;
}

http://jsfiddle.net/dqC8t/3382/

选项 3

在两个 div 元素上使用 display:inline-block，并为两个 div 元素设置一个 % 宽度，总宽度为 100%。

再次（与 float:left 示例相同）在 div 元素上使用 box-sizing: border-box;。值border-box 强制填充和边框进入宽度和高度，而不是扩展它。

注意： inline-block 元素可能存在间距问题，因为它受 HTML 标记中的空格影响。更多信息在这里：https://css-tricks.com/fighting-the-space-between-inline-block-elements/

#first, #second{
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

#wrapper {
    width: 500px;
    border: 1px solid black;
    position:relative;
}

#first {
    width:50%;
    border: 1px solid red;
    display:inline-block;
}

#second {
    width:50%;
    border: 1px solid green;
    display:inline-block;
}

http://jsfiddle.net/dqC8t/3383/

最后一个选项是使用名为 flex 的新显示选项，但请注意可能会影响浏览器兼容性：

http://caniuse.com/#feat=flexbox

http://www.sketchingwithcss.com/samplechapter/cheatsheet.html

Answer 6

解决办法如下：

#wrapper {
    width: 500px;
    border: 1px solid black;
    overflow: auto; /* so the size of the wrapper is alway the size of the longest content */
}
#first {
    float: left;
    width: 300px;
    border: 1px solid red;
}
#second {
    border: 1px solid green;
    margin: 0 0 0 302px; /* considering the border you need to use a margin so the content does not float under the first div*/
}

您的演示已更新；

http://jsfiddle.net/dqC8t/1/

Answer 7

这很容易 - 你可以努力做到这一点

.clearfix:after {
   content: " "; 
   visibility: hidden;
   display: block;
   height: 0;
   clear: both;
}

#first, #second{
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

#wrapper {
    width: 500px;
    border: 1px solid black;
}
#first {
    border: 1px solid red;
    float:left;
    width:50%;
}
#second {
    border: 1px solid green;
    float:left;
    width:50%;
}

<div id="first">Stack Overflow is for professional and enthusiast programmers, people who write code because they love it.</div>
    <div id="second">When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, so be sure to check back frequently when your question is still new for the best response.</div>
</div>

或简单的方法

#wrapper {
  display: flex;
  border: 1px solid black;
}
#first {
    border: 1px solid red;
}
#second {
    border: 1px solid green;
}

<div id="wrapper">
    <div id="first">Stack Overflow is for professional and enthusiast programmers, people who write code because they love it.</div>
    <div id="second">When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, so be sure to check back frequently when your question is still new for the best response.</div>
</div>

还有一百万种其他方式。
但我只是用简单的方法。 我还想告诉你，这里的很多答案都是不正确的 但我展示的这两种方式至少在 HTML 5 中有效。

Answer 8

尝试使用下面的代码更改将两个 div 放在彼此的前面

#wrapper {
  width: 500px;
  border: 1px solid black;
  display:flex;
}

JSFiddle link

Answer 9

这是正确的 CSS3 答案。希望这对您有所帮助：D 我真的很推荐你读这本书：https://www.amazon.com/Book-CSS3-Developers-Future-Design/dp/1593272863 其实我已经从现在读这本书得到了这个解决方案。 :D

#wrapper{
  display: flex;
  flex-direction: row;
  border: 1px solid black;
}
#first{
  width: 300px;
  border: 1px solid red;
}
#second{
  border: 1px solid green;
}

<div id="wrapper">
    <div id="first">Stack Overflow is for professional and enthusiast programmers, people who write code because they love it.</div>
    <div id="second">When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, so be sure to check back frequently when your question is still new for the best response.</div>
</div>

Answer 10

1. 在两个 div 中添加 float:left; 属性。

2. 添加display:inline-block; 属性。

3. 在父 div 中添加 display:flex; 属性。

Answer 11

我的做法：

<div class="left">Left</div>
<div class="right">Right</div>

CSS：

.left {
    float: left;
    width: calc(100% - 200px);
    background: green;
}

.right {
    float: right;
    width: 200px;
    background: yellow;
}

Answer 12

在 Material UI 和 react.js 中你可以使用网格

<Grid
  container
  direction="row"
  justify="center"
  alignItems="center"
>
    <Grid item xs>
      <Paper className={classes.paper}>xs</Paper>
    </Grid>
    <Grid item xs>
      <Paper className={classes.paper}>xs</Paper>
    </Grid>
    <Grid item xs>
      <Paper className={classes.paper}>xs</Paper>
    </Grid>

</Grid>

Answer 13

#wrapper {
width: 1200;
border: 1px solid black;
position: relative;
float: left;
}
#first {
width: 300px;
border: 1px solid red;
position: relative;
float: left;
}
#second {
border: 1px solid green;
position: relative;
float: left;
width: 500px;
}

<div id="wrapper">
    <div id="first">Stack Overflow is for professional and enthusiast programmers, people who write code because they love it.</div>
    <div id="second">When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, so be sure to check back frequently when your question is still new for the best response.</div>
</div>