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