CSS高级技巧:
- 使用 :not() 在菜单上应用/取消应用边框
- 给body添加行高
- 所有一切都垂直居中
- 逗号分隔的列表
- 使用负的 nth-child 选择项目
- 对图标使用SVG
- 优化显示文本
- 对纯CSS滑块使用 max-height
- 继承 box-sizing
- 表格单元格等宽
- 用Flexbox摆脱外边距的各种hack
- 使用属性选择器用于空链接
使用 :not() 在菜单上应用/取消应用边框
先给每一个菜单项添加边框
/* add border */.nav li { border-right: 1px solid #666;}
……然后再除去最后一个元素……
//* remove border */
.nav li:last-child { border-right: none;}
……可以直接使用 :not() 伪类来应用元素:
.nav li:not(:last-child) { border-right: 1px solid #666;}
这样代码就干净,易读,易于理解了。
当然,如果你的新元素有兄弟元素的话,也可以使用通用的兄弟选择符(~):
..nav li:first-child ~ li {
border-left: 1px solid #666;}
给 body添加行高
你不需要分别添加 line-height 到每个
,
body { line-height: 1;}
这样文本元素就可以很容易地从 body 继承。
所有一切都垂直居中
要将所有元素垂直居中,太简单了:
html, body { height: 100%; margin: 0;}body { -webkit-align-items: center; -ms-flex-align: center; align-items: center; display: -webkit-flex; display: flex;}
看,是不是很简单。
注:在IE11中要小心flexbox。
逗号分隔的列表
让HTML列表项看上去像一个真正的,用逗号分隔的列表:
ul > li:not(:last-child)::after { content: ",";}
对最后一个列表项使用 :not() 伪类。
使用负的 nth-child 选择项目
在CSS中使用负的 nth-child 选择项目1到项目n。
li { display: none;}/* select items 1 through 3 and display them */li:nth-child(-n+3) { display: block;}
就是这么容易。
对图标使用SVG
我们没有理由不对图标使用SVG:
.logo { background: url("logo.svg");}
SVG对所有的分辨率类型都具有良好的扩展性,并支持所有浏览器都回归到IE9。这样可以避开.png、.jpg或.gif文件了。
优化显示文本
有时,字体并不能在所有设备上都达到最佳的显示,所以可以让设备浏览器来帮助你:
html { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;}
注:请负责任地使用 optimizeLegibility。此外,IE /Edge没有 text-rendering 支持。
对纯CSS滑块使用 max-height
使用 max-height 和溢出隐藏来实现只有CSS的滑块:
.slider ul { max-height: 0; overlow: hidden;}.slider:hover ul { max-height: 1000px; transition: .3s ease;}
继承 box-sizing
让 box-sizing 继承 html:
html { box-sizing: border-box;}*, *:before, *:after { box-sizing: inherit;}
这样在插件或杠杆其他行为的其他组件中就能更容易地改变 box-sizing 了。
表格单元格等宽
表格工作起来很麻烦,所以务必尽量使用 table-layout: fixed 来保持单元格的等宽:
.calendar { table-layout: fixed;}
用Flexbox摆脱外边距的各种hack
当需要用到列分隔符时,通过flexbox的 space-between 属性,你就可以摆脱 nth- ,first-,和 last-child 的hack了:
.list { display: flex; justify-content: space-between;}.list .person { flex-basis: 23%;}
现在,列表分隔符就会在均匀间隔的位置出现。
使用属性选择器用于空链接
当 元素没有文本值,但 href 属性有链接的时候显示链接:
a[href^="http"]:empty::before { content: attr(href);}
相当方便。

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