RequireJS模块化后JS压缩合并

使用RequireJS模块化后代码被拆分成多个JS文件了，在部署生产环境需要压缩合并，RequireJS提供了一个打包压缩工具r.js来对模块进行合并压缩。r.js非常强大，不但可以压缩js，css，甚至可以对整个项目进行打包。

r.js的压缩工具使用UglifyJS或Closure Compiler。默认使用UglifyJS（jQuery也是使用它压缩）。此外r.js需要node.js环境，当然它也可以运行在Java环境中如Rhino。JAVA环境使用Ant构建可以参考另外一篇RequireJS optimizer Ant task有介绍。node环境参考RequireJS模块化与GruntJS构建。

本篇介绍require.js官方文档中介绍的方法。

build.xml

{

    appDir: '../www',

    baseUrl: 'js/lib',

    paths: {

        app: '../app'

    },

    dir: '../www-built',

    modules: [

        //First set up the common build layer.

        {

            //module names are relative to baseUrl

            name: '../common',

            //List common dependencies here. Only need to list

            //top level dependencies, "include" will find

            //nested dependencies.

            include: ['jquery',

                      'app/lib',

                      'app/controller/Base',

                      'app/model/Base'

            ]

        },



        //Now set up a build layer for each page, but exclude

        //the common one. "exclude" will exclude nested

        //the nested, built dependencies from "common". Any

        //"exclude" that includes built modules should be

        //listed before the build layer that wants to exclude it.

        //"include" the appropriate "app/main*" module since by default

        //it will not get added to the build since it is loaded by a nested

        //require in the page*.js files.

        {

            //module names are relative to baseUrl/paths config

            name: '../page1',

            include: ['app/main1'],

            exclude: ['../common']

        },



        {

            //module names are relative to baseUrl

            name: '../page2',

            include: ['app/main2'],

            exclude: ['../common']

        }



    ]

}

在node环境下执行 node r.js -o build.js 就可以压缩合并模块。

项目参考https://github.com/requirejs/example-multipage/blob/master/tools/build.js