前言
r.js(本地下载)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的相关内容，感兴趣的朋友们下面来一起看看吧。
简单打包
【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.js
define(function (){
return 1;
})
//s2.js
define(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
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script data-main="js/main" src="/UploadFiles/2021-04-02/require.js">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
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script data-main="js/out" src="/UploadFiles/2021-04-02/require.js">jQuery打包
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.js define(['../common/jquery'],function (){ return $('div').height(); }) //s2.js define(['../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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