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