r.js(下载)是requireJS的优化(Optimizer)工具,可以实现前端文件的压缩与合并,在requireJS异步按需加载的基础上进一步提供前端优化,减小前端文件大小、减少对服务器的文件请求。本文将详细介绍r.js
【项目结构】
以一个简单的例子来说明r.js的使用。该项目名称为'demo',在js目录下包含s1.js和s2.js两个文件,使用requirejs进行模块化,内容如下
//s1.jsdefine(function (){return 1; })//s2.jsdefine(function (){return 2; })
使用main.js来调用s1.js和s2.js这两个文件
require(['s1','s2'], function(a,b){ console.log(a+b); });
index.html的内容如下
Document
运行index.html文件,所依赖资源如下图所示
【打包】
接下来,使用r.js来对javascript文件进行打包,而r.js需要使用build.js文件来进行配置,配置如下
({ baseUrl: "./", name:'main', out:'out.js'})
接下来运行node r.js -o build.js命令
项目根目录下,生成一个out.js文件,内容如下
define("s1",[],function(){return 1}),define("s2",[],function(){return 2}),require(["s1","s2"],function(n,e){console.log(n+e)}),define("main",function(){});
将index.html的入口文件修改为'out.js',文件依然能正常运行
Document
一般地,我们并不是使用原生javascript进行开发,更多的使用库进行高效开发,以jQuery为例,对上面的代码进行改造
s1模块和s2模块,分别基于jQuery来获取页面div元素的宽、高,内容如下
//s1.jsdefine(['../common/jquery'],function (){return $('div').height(); })//s2.jsdefine(['../common/jquery'],function (){return $('div').width(); })
项目结构如下所示,js文件夹包括common和module两个子文件夹,common文件夹包含公用的require.js和jquery.js,module文件夹包含模块s1.js和s2.js。页面的根目录下,有index.html、入口文件main.js、以及r.js和build.js
【包含jQuery】
如果打包后的main.js要包含jQuery.js,则代码如下所示
({ appDir: './', //项目根目录dir: './dist', //输出目录,全部文件打包后要放入的文件夹(如果没有会自动新建的)baseUrl:'./', modules: [ //要优化的模块,相对baseUrl的路径,也是省略后缀“.js”{ name:'main' } ], fileExclusionRegExp: /^(r|build)\.js|.*\.scss$/, //过滤,匹配到的文件将不会被输出到输出目录去optimizeCss: 'standard', removeCombined: true //如果为true,将从输出目录中删除已合并的文件})
打包后的main.js内容如下所示
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