Compass核心模块
Reset ：重置CSS模块
@import "compass/reset"
Layout ：页面布局的控制能力
@import "compass/layout"
只有这两个模块是需要明确 指定引入的
@import "compass"默认包含了其他五大模块却不包含resrt,layout
其他四个功能模块和Browser support模块
CSS3：跨浏览器的CSS3能力
Helpers：内含一系列的函数，跟SASS的函数列表很像，比较少用，功能确实丰富强大
Typography：修饰我们的文本样式，垂直韵律
Utilities：没有办法放到其他模块的内容都可以放到这个模块里。辅助工具类模块，helpers都是函数，utilities多是mixin
Browser：配置compass默认支持哪些浏览器。对于特定浏览器默认支持到哪个版本。一个修改将影响六个模块的输出。不同的浏览器做不同的适配。
Compass核心模块概述&Reset模块
compass-normalize插件命令安装：
gem install compass-normalize
引入compass-normalize插件
config.rb文件里：
require 'compass-normalize'
扩展：
config.rb文件里的import-once解决了多次@import同一个文件，compass也只会插入一次被引入问件。但使用了import-once万一遇到真的遇到一个文件必须被引入两次的情况，可以通过被引入文件的文件名的后面加一个感叹号！方式来告知compass这里需要重复引入。@import "compass/reset!"
在SCSS文件中引用normalize
@import "normalize";
Normalize核心模块：
base：用来统一HTML和body标签的字体，文字大小调整、边距等等。
html5：统一html5中新增的元素的展现形式
links：统一a便签的样式修饰，去掉hover和active时候的边线。
typography：统一b、strong、sub、sup等段落文本的样式修饰。
embeds：统一img，svg等标签的样式修饰（比如统一img标签的border为0 ）
groups：统一figure、pre、code等标签的样式
forms：统一form相关的button、input、等标签的样式
tables：统一table相关的table、td、th等标签的样式
引入(通过子路径的方式)：
@import "normalize-version"//--在引入子类之前需要引入normalize-version@import "normalize/base"
@import "compass/reset/untlities"; .....引入这些mixin的集合
@import "compass/reset"; 其实就是引入了compass/reset/untlities，然后调用了其中的一个global-reset();的mixin集合。
@import "compass/reset/untlities";include global-reset();
reset Utilities核心mixin
http://compass-style.org/reference/compass/reset/utilities/
nested-reset：只用于重置我们页面上的某个选择器下的所有元素。
例如重置reset-sec的所有元素：
.reset-sec{ @include nested-reset;}
Layout模块（使用率最低的模块）
layout模块下面又细分3个核心mixin模块，可以分别引入。
1 @import "compass/layout";2 @import "compass/layout/grid-background";3 @import "compass/layout/sticky-footer";4 @import "compass/layout/stretching";
stretching模块，按父元素尺寸拉伸元素，示例：
1 .stretch-full {2 @include stretch();3 }4 .stretch-full2 {5 @include stretch(5px,0px,5px,5px); //非0值单位px不可省6 }7 .stretch-full3 {8 @include stretch($offset-top:5px,$offset-right:0px,$offset-bottom:5px,$offset-left:5px); //参数顺序可变,非0值单位px不可省9 } 经过sass转换后代码：
1 .stretch-full { 2 position: absolute; 3 top: 0; 4 bottom: 0; 5 left: 0; 6 right: 0; 7 } 8 .stretch-full2 { 9 position: absolute;10 top: 5px;11 bottom: 0;12 left: 5px; right: 5px;13 }14 .stretch-full3 {15 position: absolute; 16 top: 5px;17 bottom: 5px;18 left: 5px; right: 0px;19 } sticky-footer模块,提供footer总在页面最底部的解决方案，需要固定的结构：
1 <body>2 <div id="root">3 <div id="root_footer"></div>4 </div>5 <div id="footer">6 Footer content goes here.7 </div>8 </body>
@include sticky-footer(54px) //参数为footer高度@include sticky-footer(54px, "#my-root", "#my-root-footer", "#my-footer") // 自定义选择器
CSS3模块&Browser Support模块(主动使用率较高的模块)
在用CSS3模块的时候要调整Browser Support模块的配置，即使不主动调整CSS3也引入了Browser Support模块。CSS3模块主要用于跨浏览的CSS3的能力。
例：
1 @import "compass/css3";2 .webdome-sec{3 @include box-shadow(1px 1px 3px 2px #cfcecf);4 } 生成的代码：
1 .webdemo-sec {2 -moz-box-shadow: 1px 1px 3px 2px #cfcedf;3 -webkit-box-shadow: 1px 1px 3px 2px #cfcedf;4 box-shadow: 1px 1px 3px 2px #cfcedf;5 } 假如不需要自动生成Firefox的适配代码，这时就需要用Browser Support模块。来配置compass默认支持哪些浏览器。对于特定浏览器支持到哪个版本。Browser Support模块一但修改将影响其余六个模块的输出。
引入support：
@import "compass/support";
引入了CSS3模块，相当于间接引入了support模块。
查看当前支持的浏览器版本：
控制台命令：
1 compass interactive //进入一个用于测试Compass中SassScript的控制台2 browsers() //查看支持的浏览器3 browser-versions(chrome) //查看支持的chrome版本
在sass文件中输入 @debug browsers() 控制台也会打印出支持的浏览器。
设置compass支持的浏览器：
@import "compass/css3";$supported-browsers: chrome firefox;
也可以写成： $supported-browsers: chrome,firefox ; 浏览器队列用 空格或者逗号分隔均可。
设置compass支持的浏览器的最低版本（compass默认支持到ie5.5）：
$browser-minimum-versions:("ie":"8","":"") 不设置的话 默认支持 browsers-versions 返回的的版本。
Animation：CSS3动画相关的特性。
Appearance：CSS3的appearance属性，也是CSS3的新规范中新定义的新属性。（还没有一个主流的浏览器支持这个属性）
Background Clip、Background Origin、Background Size：CSS3新增的background相关的属性，用来规定背景的绘制区域、背景图像的定位原点、背景图像的尺寸等。
Border Radius：边框圆角属性
Box、Box Shadow
Box Sizing：用来修改盒模型的宽高的度量方式。
CSS Regions：控制内容布局的新方式
CSS3 Pie：尽可能提高ie浏览器呈现许多CSS3功能
Columns：CSS3的多列布局属性
Filter：主要用于在图片上实现一些特效
Flexbox：（移动端web开发用的比较多）
Font Face：不依赖于用户计算机上安装好的字体，指定下载好的某一种字体
Hyphenation：如何断字换行
Images：CSS3新增了这种生成渐变图形的方式，images用于需要使用这两种方式充当图片的场景。
Inline Block：实现跨浏览器的display:inline-block;能力
Opacity：透明属性，为了兼容低版本的IE
Selection：使用CSS3的selection伪元素定义被选中文本的颜色和背景色
Shared Utilities：想贡献CSS3模块的相关compass插件会用到。工具类模块
Text Shadow：文字阴影属性
Transform、Transition：变幻动画属性
User Interface：限制某一区域是否允许鼠标拖拽选择，input元素在无填写状态下提示语的样式
Typography模块
分为四个模块：
Links：链接修饰模块正常态下去掉下划线，在hover的情况下才显示这个下划线hover-link();
1 a{2 @include hover-link();3 } 编译之后：
1 a {2 text-decoration: none;3 }4 a:hover, a:focus {5 text-decoration: underline;6 } 修改不同状态下超链接的颜色link-colors
抹平超链接样式，和他跟父容器的文本无异unstyled Link
Lists：列表修饰模块
Text：文本修饰模块
Vertical Rhythm：垂直韵律修饰模块
@import "compass/typography/vertical_rhythm";
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