2016-12-14 02:24:49 +00:00
|
|
|
|
---
|
2024-10-20 21:46:35 +00:00
|
|
|
|
language: Sass
|
2016-12-14 02:24:49 +00:00
|
|
|
|
filename: learnsass-cn.scss
|
|
|
|
|
|
contributors:
|
|
|
|
|
|
- ["Laura Kyle", "https://github.com/LauraNK"]
|
|
|
|
|
|
- ["Sean Corrales", "https://github.com/droidenator"]
|
|
|
|
|
|
- ["Kyle Mendes", "https://github.com/pink401k"]
|
|
|
|
|
|
- ["Keith Miyake", "https://github.com/kaymmm"]
|
|
|
|
|
|
translators:
|
|
|
|
|
|
- ["Jiang Haiyun", "http://www.atjiang.com"]
|
|
|
|
|
|
lang: zh-cn
|
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
|
|
Sass是一种CSS扩展语言，它增加了诸如变量、嵌套、mixin等功能。
|
|
|
|
|
|
Sass(以及其它预处理器，如[Less](http://lesscss.org/)等) 能帮助开发人员编写易维护和 DRY (Don't Repeat Yourself)的代码。
|
|
|
|
|
|
|
|
|
|
|
|
Sass有两种不同的语法可选用。SCSS的语法和CSS的相同，但增加了Sass的额外功能。或者Sass（原来的语法），它使用缩进而非大括号和分号。
|
|
|
|
|
|
|
|
|
|
|
|
本教程使用SCSS编写。
|
|
|
|
|
|
|
|
|
|
|
|
如果你已熟悉CSS3，你可能相对能较快地掌握Sass。它并没有提供任何新的类型属性，而只是提供了一些工具使你能更高效的编写CSS，并且使维护更加容易。
|
|
|
|
|
|
|
|
|
|
|
|
```scss
|
|
|
|
|
|
// 单行注释当Sass被编译成CSS后会被删除。
|
|
|
|
|
|
|
|
|
|
|
|
/* 多行注释将保留. */
|
|
|
|
|
|
|
|
|
|
|
|
/* 变量
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 你可以将一个CSS值（如一个颜色值）保存到变量中。
|
|
|
|
|
|
使用'$'符号来创建一个变量。*/
|
|
|
|
|
|
|
|
|
|
|
|
$primary-color: #A3A4FF;
|
|
|
|
|
|
$secondary-color: #51527F;
|
|
|
|
|
|
$body-font: 'Roboto', sans-serif;
|
|
|
|
|
|
|
|
|
|
|
|
/* 你可以在你的样式文件中使用变量。
|
|
|
|
|
|
现在假如你想修改颜色，你只需修改一次即可。*/
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
background-color: $primary-color;
|
|
|
|
|
|
color: $secondary-color;
|
|
|
|
|
|
font-family: $body-font;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 以上将编译成： */
|
|
|
|
|
|
body {
|
|
|
|
|
|
background-color: #A3A4FF;
|
|
|
|
|
|
color: #51527F;
|
|
|
|
|
|
font-family: 'Roboto', sans-serif;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 相比于在你的样式文件中逐个进行修改，这种方式维护性更好。 */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 控制指令
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass允许你使用@if, @else, @for, @while, 和 @each 来控制
|
|
|
|
|
|
你的代码如何编译成CSS */
|
|
|
|
|
|
|
|
|
|
|
|
/* @if/@else块的行为和你可能预想的会完全相同 */
|
|
|
|
|
|
|
|
|
|
|
|
$debug: true !default;
|
|
|
|
|
|
|
|
|
|
|
|
@mixin debugmode {
|
|
|
|
|
|
@if $debug {
|
|
|
|
|
|
@debug "Debug mode enabled";
|
|
|
|
|
|
|
|
|
|
|
|
display: inline-block;
|
|
|
|
|
|
}
|
|
|
|
|
|
@else {
|
|
|
|
|
|
display: none;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.info {
|
|
|
|
|
|
@include debugmode;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 如果$debug设置为了true, .info 将会显示; 如果设置为false那么
|
|
|
|
|
|
.info 将不显示。
|
|
|
|
|
|
|
|
|
|
|
|
注意： @debug将在命令行中输出调试信息。
|
|
|
|
|
|
在调试你的SCSS时它对于检查变量很有用。*/
|
|
|
|
|
|
|
|
|
|
|
|
.info {
|
|
|
|
|
|
display: inline-block;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* @for是控制循环，它能遍历区间值。
|
|
|
|
|
|
它对于设置一组元素的类型特别有用。
|
|
|
|
|
|
有两种形式，"through"和"to"。前者包括最末那个值，
|
|
|
|
|
|
而后者止于最末那个值。
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
@for $c from 1 to 4 {
|
|
|
|
|
|
div:nth-of-type(#{$c}) {
|
|
|
|
|
|
left: ($c - 1) * 900 / 3;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
@for $c from 1 through 3 {
|
|
|
|
|
|
.myclass-#{$c} {
|
|
|
|
|
|
color: rgb($c * 255 / 3, $c * 255 / 3, $c * 255 / 3);
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 将编译成: */
|
|
|
|
|
|
|
|
|
|
|
|
div:nth-of-type(1) {
|
|
|
|
|
|
left: 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
div:nth-of-type(2) {
|
|
|
|
|
|
left: 300;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
div:nth-of-type(3) {
|
|
|
|
|
|
left: 600;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.myclass-1 {
|
|
|
|
|
|
color: #555555;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.myclass-2 {
|
|
|
|
|
|
color: #aaaaaa;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.myclass-3 {
|
|
|
|
|
|
color: white;
|
|
|
|
|
|
// SASS automatically converts #FFFFFF to white
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* @while也非常直白： */
|
|
|
|
|
|
|
|
|
|
|
|
$columns: 4;
|
|
|
|
|
|
$column-width: 80px;
|
|
|
|
|
|
|
|
|
|
|
|
@while $columns > 0 {
|
|
|
|
|
|
.col-#{$columns} {
|
|
|
|
|
|
width: $column-width;
|
|
|
|
|
|
left: $column-width * ($columns - 1);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
$columns: $columns - 1;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 将输出以下CSS: */
|
|
|
|
|
|
|
|
|
|
|
|
.col-4 {
|
|
|
|
|
|
width: 80px;
|
|
|
|
|
|
left: 240px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.col-3 {
|
|
|
|
|
|
width: 80px;
|
|
|
|
|
|
left: 160px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.col-2 {
|
|
|
|
|
|
width: 80px;
|
|
|
|
|
|
left: 80px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.col-1 {
|
|
|
|
|
|
width: 80px;
|
|
|
|
|
|
left: 0px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* @each函数类似@for, 除了它使用一个列表而不是序列值
|
|
|
|
|
|
注意: 你指定列表的方式和指定其它变量一样，
|
|
|
|
|
|
用空格作为分隔符。 */
|
|
|
|
|
|
|
|
|
|
|
|
$social-links: facebook twitter linkedin reddit;
|
|
|
|
|
|
|
|
|
|
|
|
.social-links {
|
|
|
|
|
|
@each $sm in $social-links {
|
|
|
|
|
|
.icon-#{$sm} {
|
|
|
|
|
|
background-image: url("images/#{$sm}.png");
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 将输出: */
|
|
|
|
|
|
|
|
|
|
|
|
.social-links .icon-facebook {
|
|
|
|
|
|
background-image: url("images/facebook.png");
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.social-links .icon-twitter {
|
|
|
|
|
|
background-image: url("images/twitter.png");
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.social-links .icon-linkedin {
|
|
|
|
|
|
background-image: url("images/linkedin.png");
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.social-links .icon-reddit {
|
|
|
|
|
|
background-image: url("images/reddit.png");
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Mixins
|
|
|
|
|
|
==============================*/
|
|
|
|
|
|
|
|
|
|
|
|
/* 如果你发现你要为多个元素编写相同的代码，
|
|
|
|
|
|
你可能想将那些代码保存到一个mixin中。
|
|
|
|
|
|
|
|
|
|
|
|
使用'@mixin'指令，再为你的mixin加上一个名称。*/
|
|
|
|
|
|
|
|
|
|
|
|
@mixin center {
|
|
|
|
|
|
display: block;
|
|
|
|
|
|
margin-left: auto;
|
|
|
|
|
|
margin-right: auto;
|
|
|
|
|
|
left: 0;
|
|
|
|
|
|
right: 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 你可以通过'@include'及mixin名来调用mixin。 */
|
|
|
|
|
|
|
|
|
|
|
|
div {
|
|
|
|
|
|
@include center;
|
|
|
|
|
|
background-color: $primary-color;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 将编译成: */
|
|
|
|
|
|
div {
|
|
|
|
|
|
display: block;
|
|
|
|
|
|
margin-left: auto;
|
|
|
|
|
|
margin-right: auto;
|
|
|
|
|
|
left: 0;
|
|
|
|
|
|
right: 0;
|
|
|
|
|
|
background-color: #A3A4FF;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 你可以使用mixin来创建一个快捷属性。*/
|
|
|
|
|
|
|
|
|
|
|
|
@mixin size($width, $height) {
|
|
|
|
|
|
width: $width;
|
|
|
|
|
|
height: $height;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 你可以通过传入width和height参数来调用它。*/
|
|
|
|
|
|
|
|
|
|
|
|
.rectangle {
|
|
|
|
|
|
@include size(100px, 60px);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.square {
|
|
|
|
|
|
@include size(40px, 40px);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
.rectangle {
|
|
|
|
|
|
width: 100px;
|
|
|
|
|
|
height: 60px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.square {
|
|
|
|
|
|
width: 40px;
|
|
|
|
|
|
height: 40px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 函数
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass提供的函数可以用来完成各种各样的任务。
|
|
|
|
|
|
考虑以下情况 */
|
|
|
|
|
|
|
|
|
|
|
|
/* 函数可以通过其名称及传入其所需的参数来调用 */
|
|
|
|
|
|
body {
|
|
|
|
|
|
width: round(10.25px);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.footer {
|
|
|
|
|
|
background-color: fade_out(#000000, 0.25);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
width: 10px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.footer {
|
|
|
|
|
|
background-color: rgba(0, 0, 0, 0.75);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 你也可以定义你自己的函数。函数非常类似于mixin。
|
|
|
|
|
|
当你在函数和mixin之间抉择时，记住mixin最适合于创建CSS而函数更适合于
|
|
|
|
|
|
处理那些可能在你的Sass代码中使用的逻辑。'数学运算符'部分的例子
|
|
|
|
|
|
是转成可重用函数的最理想选择。 */
|
|
|
|
|
|
|
|
|
|
|
|
/* 该函数将接收一个目标尺寸大小和父结点尺寸大小，然后计算并
|
|
|
|
|
|
返回百分数 */
|
|
|
|
|
|
|
|
|
|
|
|
@function calculate-percentage($target-size, $parent-size) {
|
|
|
|
|
|
@return $target-size / $parent-size * 100%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
$main-content: calculate-percentage(600px, 960px);
|
|
|
|
|
|
|
|
|
|
|
|
.main-content {
|
|
|
|
|
|
width: $main-content;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.sidebar {
|
|
|
|
|
|
width: calculate-percentage(300px, 960px);
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
|
|
|
|
|
|
.main-content {
|
|
|
|
|
|
width: 62.5%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.sidebar {
|
|
|
|
|
|
width: 31.25%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 扩展 (继承)
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 扩展是在选择子间共享属性的一种方法。 */
|
|
|
|
|
|
|
|
|
|
|
|
.display {
|
|
|
|
|
|
@include size(5em, 5em);
|
|
|
|
|
|
border: 5px solid $secondary-color;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.display-success {
|
|
|
|
|
|
@extend .display;
|
|
|
|
|
|
border-color: #22df56;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
.display, .display-success {
|
|
|
|
|
|
width: 5em;
|
|
|
|
|
|
height: 5em;
|
|
|
|
|
|
border: 5px solid #51527F;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.display-success {
|
|
|
|
|
|
border-color: #22df56;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 扩展一条CSS语句优于创建一个mixin，
|
|
|
|
|
|
这是由Sass组合所有共享相同基样式的类的方式决定的。
|
|
|
|
|
|
如果使用mixin完成，width, height, 和border将会在
|
|
|
|
|
|
调用了该mixin的每条语句中重复。虽然它不至于会影响你的工作流，
|
|
|
|
|
|
但它会在由Sass编译器生成的的文件中添加不必要的代码。*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 嵌套
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass允许在选择子中嵌套选择子 */
|
|
|
|
|
|
|
|
|
|
|
|
ul {
|
|
|
|
|
|
list-style-type: none;
|
|
|
|
|
|
margin-top: 2em;
|
|
|
|
|
|
|
|
|
|
|
|
li {
|
|
|
|
|
|
background-color: #FF0000;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* '&'将被父选择子替换。*/
|
|
|
|
|
|
/* 你也可以嵌套伪类。 */
|
|
|
|
|
|
/* 注意过度嵌套将导致你的代码难以维护。
|
|
|
|
|
|
最佳实践推荐在嵌套时不超过3层。
|
|
|
|
|
|
例如： */
|
|
|
|
|
|
|
|
|
|
|
|
ul {
|
|
|
|
|
|
list-style-type: none;
|
|
|
|
|
|
margin-top: 2em;
|
|
|
|
|
|
|
|
|
|
|
|
li {
|
|
|
|
|
|
background-color: red;
|
|
|
|
|
|
|
|
|
|
|
|
&:hover {
|
|
|
|
|
|
background-color: blue;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
a {
|
|
|
|
|
|
color: white;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成： */
|
|
|
|
|
|
|
|
|
|
|
|
ul {
|
|
|
|
|
|
list-style-type: none;
|
|
|
|
|
|
margin-top: 2em;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ul li {
|
|
|
|
|
|
background-color: red;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ul li:hover {
|
|
|
|
|
|
background-color: blue;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
ul li a {
|
|
|
|
|
|
color: white;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 片段与导入
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass允许你创建片段文件。它有助于你的Sass代码保持模块化。
|
|
|
|
|
|
片段文件应该以 '_' 开头，例如 _reset.css。
|
|
|
|
|
|
片段不会输出到CSS中。*/
|
|
|
|
|
|
|
|
|
|
|
|
/* 考虑以下的CSS，我们会将它们放入一个叫作_reset.css的文件中 */
|
|
|
|
|
|
|
|
|
|
|
|
html,
|
|
|
|
|
|
body,
|
|
|
|
|
|
ul,
|
|
|
|
|
|
ol {
|
|
|
|
|
|
margin: 0;
|
|
|
|
|
|
padding: 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass提供的@import能用来将片段导入到文件中。
|
|
|
|
|
|
它与传统的CSS @import语句不同，不需要通过
|
|
|
|
|
|
另外的HTTP请求来获取导入的文件。
|
|
|
|
|
|
Sass提取导入文件并将它与编译后的代码结合起来。 */
|
|
|
|
|
|
|
|
|
|
|
|
@import 'reset';
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
font-size: 16px;
|
|
|
|
|
|
font-family: Helvetica, Arial, Sans-serif;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
|
|
|
|
|
|
html, body, ul, ol {
|
|
|
|
|
|
margin: 0;
|
|
|
|
|
|
padding: 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
font-size: 16px;
|
|
|
|
|
|
font-family: Helvetica, Arial, Sans-serif;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 占位符选择子
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 占位符在创建用于扩展的CSS语句时非常有用。
|
|
|
|
|
|
如果你想创建一条只通过@extend使用的CSS语句，你可以利用占位符来实现。
|
|
|
|
|
|
占位符以'%'而非'.'或'#'开头。占位符不会出现在编译后的CSS中 */
|
|
|
|
|
|
|
|
|
|
|
|
%content-window {
|
|
|
|
|
|
font-size: 14px;
|
|
|
|
|
|
padding: 10px;
|
|
|
|
|
|
color: #000;
|
|
|
|
|
|
border-radius: 4px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.message-window {
|
|
|
|
|
|
@extend %content-window;
|
|
|
|
|
|
background-color: #0000ff;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成: */
|
|
|
|
|
|
|
|
|
|
|
|
.message-window {
|
|
|
|
|
|
font-size: 14px;
|
|
|
|
|
|
padding: 10px;
|
|
|
|
|
|
color: #000;
|
|
|
|
|
|
border-radius: 4px;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.message-window {
|
|
|
|
|
|
background-color: #0000ff;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 数学运算
|
|
|
|
|
|
============================== */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Sass提供以下的运算符: +, -, *, /, 和 %。它们
|
|
|
|
|
|
相比于使用你事先手工计算好了的数值，它们
|
|
|
|
|
|
对于直接在你的Sass文件中计算数值很有用。
|
|
|
|
|
|
以下是设置一个简单的两列设计的例子。*/
|
|
|
|
|
|
|
|
|
|
|
|
$content-area: 960px;
|
|
|
|
|
|
$main-content: 600px;
|
|
|
|
|
|
$sidebar-content: 300px;
|
|
|
|
|
|
|
|
|
|
|
|
$main-size: $main-content / $content-area * 100%;
|
|
|
|
|
|
$sidebar-size: $sidebar-content / $content-area * 100%;
|
|
|
|
|
|
$gutter: 100% - ($main-size + $sidebar-size);
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
width: 100%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.main-content {
|
|
|
|
|
|
width: $main-size;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.sidebar {
|
|
|
|
|
|
width: $sidebar-size;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.gutter {
|
|
|
|
|
|
width: $gutter;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* 编译成： */
|
|
|
|
|
|
|
|
|
|
|
|
body {
|
|
|
|
|
|
width: 100%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.main-content {
|
|
|
|
|
|
width: 62.5%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.sidebar {
|
|
|
|
|
|
width: 31.25%;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
.gutter {
|
|
|
|
|
|
width: 6.25%;
|
|
|
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
## SASS还是Sass?
|
|
|
|
|
|
该语言的名字，“Sass”，是一个词，不是一个缩写。
|
|
|
|
|
|
你有没想过Sass是否是一个缩写词？你可能没有，但我反正会告诉你。
|
|
|
|
|
|
该语言的名字是一个单词，不是一个缩写词。
|
|
|
|
|
|
由于人们老是将它写成"SASS"，语言的作者开玩笑地称它为"Syntactically Awesome StyleSheets"。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 实践Sass
|
|
|
|
|
|
如果你想在你的浏览器中尝试Sass，参阅[SassMeister](http://sassmeister.com/)。
|
|
|
|
|
|
你可以选用任一种语法，只需进到设置页然后选择Sass或SCSS。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 兼容性
|
|
|
|
|
|
Sass可以用于任何项目中，只要你有程序能将它编译成CSS即可。你还需要验证你所使用的CSS是否与你的目标浏览器兼容。
|
|
|
|
|
|
|
|
|
|
|
|
[QuirksMode CSS](http://www.quirksmode.org/css/)和[CanIUse](http://caniuse.com)对于检查兼容性来说都是不错的资源。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## 延伸阅读资料
|
|
|
|
|
|
* [Official Documentation](http://sass-lang.com/documentation/file.SASS_REFERENCE.html)
|
|
|
|
|
|
* [The Sass Way](http://thesassway.com/) 上提供了教程(初学者-高级)和文章。
|
