html - 在 div 内水平居中元素

Question

为了简单起见，假设您有一个 100 像素宽的 div，其中有 3 个 div，每个 20 像素宽。如何将它们对齐到它们与 div 中心对齐的位置，留下 20px；每边的间隙？

Answer 1

将一些 HTML 元素居中始终取决于您的项目和集成依赖项...

您可能对这 2 个解决方案感到满意， display: inline-block; 和浮动：左；

各有优劣，希望对你有帮助！

http://jsfiddle.net/HP2DS/1/

<!-- Inline-block -->
<div id='container'>
    <div class='centered' id='content-left'></div><div class='centered' id='content-center'></div><div class='centered' id='content-right'></div>
</div>

#container {
    width: 100px;
    height: 80px;
    text-align: center;
    background: cyan;
}

#container .centered {
    display: inline-block;
    width: 20px;
    height: 100%;
    margin: auto;
    background: magenta;
    border: 1px solid black;
    box-sizing: border-box;
}

<!-- Floating -->
<div id='container-2'>
    <div class='centered' id='content-2-left'></div>
    <div class='centered' id='content-2-center'></div>
    <div class='centered' id='content-2-right'></div>
</div>

#container-2 {
    width: 60px; /* 60px + 2*20px of padding... */
    height: 80px;
    padding: 0 20px;
    text-align: center;
    background: cyan;
}

#container-2 .centered {
    float: left;
    width: 20px;
    height: 100%;
    margin: auto;
    background: magenta;
    border: 1px solid black;
    box-sizing: border-box;
}

Answer 2

再会！以下是我的实现方式：

HTML

<div id="container">
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
</div>

CSS

#container {
  width: 100px;
  height: 100px;
  border: 1px solid red; /** for viewing purposes **/
  text-align: center; /** center the divs **/
  font-size: 0; /** remove the unwanted space caused by display: inline-block in .child **/
}

#container .child {
  display: inline-block; /** set the divs side-by-side **/
  vertical-align: top;
  width: 20px;
  height: 100px;
  font-size: 12px; /** override font-size: 0 of #container, so that text will be visible again **/
  text-align: left; /** set text in the .child divs back to normal alignment **/
  border: 1px solid blue; /** for viewing purposes **/
  box-sizing: border-box;
}

我希望这有帮助。干杯! :)