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利用r.js打包模块化的javascript文件方法示例

程序员文章站 2022-04-10 11:12:53
前言 ()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...

前言

()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="js/require.js"></script>
</head>
<body>
</body>
</html>

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="js/require.js"></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.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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【不包含jquery】

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

利用r.js打包模块化的javascript文件方法示例

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

利用r.js打包模块化的javascript文件方法示例

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(){});

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如有疑问大家可以留言交流,谢谢大家对的支持。