NodeJs管理Less/Sass_html/css_WEB-ITnose
预计阅读时间: 5 分钟
介绍
less官网 http://lesscss.org/
sass官网 http://sass-lang.com/
可以命令行安装也可以直接下载,其中less可以通过Nodejs的npm包管理去下载管理,sass则需要ruby去下载安装。
通过命令行,npm安装less
npm install -g less
Less知识点
- Variables变量定义
- Nested Rules嵌套规则(&代表当前元素的父元素)
- Operations算数表达式
- Functions函数
- Scope作用域
- import引用文件
变量
@nice-blue: #5B83AD;@light-blue: @nice-blue + #111;#header { color: @light-blue;}
output输出
#header { color: #6c94be;}
嵌套规则
#header { color: black; .navigation { font-size: 12px; } .logo { width: 300px; }}//相当于下面代码#header { color: black;}#header .navigation { font-size: 12px;}#header .logo { width: 300px;}
算数表达式
// example with variables@base: 5%;@filler: @base * 2; // result is 10%@other: @base + @filler; // result is 15%
函数
@base: #f04615;@width: 0.5;//percentage, saturate, lighten, spin等都是函数.class { width: percentage(@width); // returns `50%` color: saturate(@base, 5%); background-color: spin(lighten(@base, 25%), 8);}
作用域
@var: red;#page { #header { color: @var; // white } @var: white;}
引用文件
@import "library"; // library.less@import "typo.css";
怎么编译less呢?
命令行进入存放less文件的文件夹,用下述命令编译less,下面是在当前文件夹下输出css。lessc命令后面是less的存放路径和css的存放路径
$ lessc styles.less styles.css
less中间件用法
less-middleware官网: https://www.npmjs.com/package/less-middleware,进入项目文件夹,用命令行安装
npm install less-middleware --save

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