前面的话
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
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.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
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script data-main="js/main" src="js/require.js?1.1.11"></script> </head> <body> </body> </html>
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="js/require.js?1.1.11"></script> </head> <body> </body> </html>
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.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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0,t.target||(t.target=r),n=null==n?[t]:ge.makeArray(n,[t]),f=ge.event.special[d]||{},i||!f.trigger||f.trigger.apply(r,n)!==!1)){if(!i&&!f.noBubble&&!ge.isWindow(r)){for(u=f.delegateType||d,Et.test(u+d)||(a=a.parentNode);a;a=a.parentNode)p.push(a),s=a;s===(r.ownerDocument||ne)&&p.push(s.defaultView||s.parentWindow||e)}for(o=0;(a=p[o++])&&!t.isPropagationStopped();)t.type=o>1?u:f.bindType||d,c=(Pe.get(a,"events")||{})[t.type]&&Pe.get(a,"handle"),c&&c.apply(a,n),c=l&&a[l],c&&c.apply&&Oe(a)&&(t.result=c.apply(a,n),t.result===!1&&t.preventDefault());return t.type=d,i||t.isDefaultPrevented()||f._default&&f._default.apply(p.pop(),n)!==!1||!Oe(r)||l&&ge.isFunction(r[d])&&!ge.isWindow(r)&&(s=r[l],s&&(r[l]=null),ge.event.triggered=d,r[d](),ge.event.triggered=void 0,s&&(r[l]=s)),t.result}},simulate:function(e,t,n){var r=ge.extend(new ge.Event,n,{type:e,isSimulated:!0});ge.event.trigger(r,null,t)}}),ge.fn.extend({trigger:function(e,t){return this.each(function(){ge.event.trigger(e,t,this)})},triggerHandler:function(e,t){var n=this[0];if(n)return ge.event.trigger(e,t,n,!0)}}),ge.each("blur focus focusin focusout resize scroll click dblclick mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave change select submit keydown keypress keyup contextmenu".split(" "),function(e,t){ge.fn[t]=function(e,n){return arguments.length>0?this.on(t,null,e,n):this.trigger(t)}}),ge.fn.extend({hover:function(e,t){return this.mouseenter(e).mouseleave(t||e)}}),de.focusin="onfocusin"in e,de.focusin||ge.each({focus:"focusin",blur:"focusout"},function(e,t){var n=function(e){ge.event.simulate(t,e.target,ge.event.fix(e))};ge.event.special[t]={setup:function(){var r=this.ownerDocument||this,i=Pe.access(r,t);i||r.addEventListener(e,n,!0),Pe.access(r,t,(i||0)+1)},teardown:function(){var r=this.ownerDocument||this,i=Pe.access(r,t)-1;i?Pe.access(r,t,i):(r.removeEventListener(e,n,!0),Pe.remove(r,t))}}});var 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如果其他页面也需要用到jQuery，它们打包的时候，也会把jQuery打包。这样，相当于每个页面都打包了一次jQuery，性能很差。更好的做法是，不打包jQuery，其他页面引用jQuery时，就可以使用缓存了。
build.js内容如下所示
({
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',
exclude: ['js/common/jquery']//不打包jQuery }
],
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})接下来运行node r.js -o build.js命令
运行后，生成一个'dist'文件夹，该文件夹包含的文件都是处理过后的文件，适合上线
打包后的main.js内容如下所示
define("js/module/s1",["../common/jquery"],function(){return $("div").height()}),define("js/module/s2",["../common/jquery"],function(){return $("div").width()}),require(["js/module/s1","js/module/s2"],function(e,n){console.log(parseInt(e)+parseInt(n))}),define("main",function(){});
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