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利用r.js打包模块化的javascript文件方法示例
站长资源 2024/11/27 佚名
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DDR爱好者之家 Design By 杰米

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


利用r.js打包模块化的javascript文件方法示例


【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


利用r.js打包模块化的javascript文件方法示例


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


利用r.js打包模块化的javascript文件方法示例


【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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