一. Sass/Scss&Less是什么?Sass (Syntactically Awesome Stylesheets)是一种动态样式语言,语法跟css一样(但多了些功能),比css好写,而且更容易阅读。Sass语法类似与Haml,属于缩排语法(makeup),用意就是为了快速写Html和Css。Less一种动态样式语言. 将CSS赋予了动态语言的特性,如变量,继承,运算, 函数. LESS 既可以在客户端上运行 (支持IE 6+, Webkit, Firefox),也可一在服务端运行 (借助 Node.js)。less英文站需要翻墙,也可以访问中文站Sass与Scss有什么差别Sass原先跟Haml一样的缩排语法,对于写惯Css的前端来说是很不直观的,也不能将原来的Css加到Sass里面,因此Sass改良了语法,Sass 3就变成了Scss(Sassy CSS)。与原来的语法兼容,只是用{}取代了原来的缩进。二. Sass/Scss&Less区别?1.Sass是基于Ruby的,是在服务端处理的,而Less是需要引入less.js来处理Less代码输出Css到浏览器,也可以在开发环节使用Less,然后编译成Css文件,直接放到项目中,也有Less.app、SimpleLess、CodeKit.app这样的工具,也有在线编译地址。2.变量符不一样,less是@,而Scss是$,而且变量的作用域也不一样,后面会讲到。3.输出设置,Less没有输出设置,Sass提供4中输出选项:nested, compact, compressed 和 expanded。4.Sass支持条件语句,可以使用if{}else{},for{}循环等等。而Less不支持。
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