原文地址：http://tutorialzine.com/2016/03/quick-tip-the-best-way-to-make-sticky-footers/
在开发网页布局的时候，你可能已经遇到了这个问题：
你可能会设置一个页脚在 body 的最后一部分，但是当页面中没有太多内容的时候，页脚就会留在屏幕的中间，它的下面会出现很大面积的空白。
在这个小教程中，我们将使用现代化的技术来构建一个页脚，保证页脚在任何时候都固定在页面的底部。
为了防止上述情况的发生，我们将使用 Flexbox 来建立我们的网页，它是 CSS3 所提供的建立响应式布局的方法。对于那些你不熟悉的 Flexbox 的模型和它的属性，我会留下一些链接在文章的结尾。
我们使用的例子很简单，头部、主要部分、页脚。下面是 HTML，没有什么特别的部分。
<body> <header>...</header> <sectionclass="main-content">...</section> <footer>...</footer></body>
为了使用 Flex，我们将 body 的 display 属性设置为 flex，然后将 flex-direction 设置为 column（默认是 horizontal），另外设置 html 和 body 的高度为 100%，填充整个屏幕。
html{ height: 100%;} body{ display: flex; flex-direction: column; height: 100%;} 现在我们将设置下面的这几个 flex 属性，网页中每个部分占用的空间。
- flex-grow：元素在一个容器中对可分配空间占用的比率。
- flex-shrink：如果空间不足，元素收缩的比率。
- flex-basis：元素的默认值。
我们希望页眉和页脚占用固定的一部分空间，剩下的空间全都分成主要内容。这样的布局 CSS 如下：
header{ /* We want the header to have a static height, it will always take up just as much space as it needs. */ /* 0 flex-grow, 0 flex-shrink, auto flex-basis */ flex: 0 0 auto;} .main-content{ /* By setting flex-grow to 1, the main content will take up all of the remaining space on the page. The other elements have flex-grow: 0 and won't contest the free space. */ /* 1 flex-grow, 0 flex-shrink, auto flex-basis */ flex: 1 0 auto;} footer{ /* Like the header, the footer will have a static height - it shouldn't grow or shrink. */ /* 0 flex-grow, 0 flex-shrink, auto flex-basis */ flex: 0 0 auto;} 你可以点击下面的图片查看我们的演示的页面，点击粉色的达按钮，你可以改变网页的内容量，你将观察到无论什么时候页脚都是在网页的底部。
结论
正如你所看到的，Flexbox 在布局中是一个强有力的工具。几乎所有的主流浏览器都支持它，IE 浏览器需要在版本在 IE9+。
这里有一些学习 Flexbox 的经验：
- CSS 技巧之 Flexbox。 here
- 专门使用 Flexbox 技术的网站。 here
- 5分钟的互动课程。 here
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