Gruntjs: grunt-usemin使用心得

grunt-usemin：

Replaces references to non-optimized scripts or stylesheets into a set of HTML files

usemin exports 2 different tasks:

useminPrepare prepares the configuration to transform specific construction (blocks) in the scrutinized file into a single line, targeting an optimized version of the files
usemin replaces the blocks by the file they reference, and replaces all references to assets by their revisioned version if it is found on the disk. This target modifies the files it is working on.

Usually, useminPrepare is launched first, then the steps of the transformation flow (for example, concat, uglify, and cssmin), and then, in the end usemin is launched.

我的工作目录

workspace/

　　——app/

　　　　——js/

　　　　——tpl/

Gruntfile.js配置

 1 module.exports = function(grunt) {
 2 
 3     // Project configuration.
 4     grunt.initConfig({
 5 
 6         useminPrepare: {
 7             html: ['app/tpl/**/*.html'],
 8             options: {
 9                 // 测试发现这里指定的dest，是usemin引入资源的相对路径的开始
10                 // 在usemin中设置assetsDirs，不是指定的相对路径
11                 // List of directories where we should start to look for revved version of the assets referenced in the currently looked at file
12                 dest: 'build/tpl'               // string type                 
13             }
14         },
15         usemin: { 
16             html: ['build/tpl/**/*.html'],      // 注意此处是build/
17             options: {
18                 assetsDirs: ['build/js']
19             }
20         },
21         copy: {
22             html: {
23                 expand: true,                   // 需要该参数
24                 cwd: 'app/',
25                 src: ['tpl/**/*.html'],         // 会把tpl文件夹+文件复制过去
26                 dest: 'build'
27             }
28         } 
29 
30     });
31 
32   grunt.loadNpmTasks('grunt-contrib-uglify');
33   grunt.loadNpmTasks('grunt-contrib-copy');
34   grunt.loadNpmTasks('grunt-contrib-concat');
35   grunt.loadNpmTasks('grunt-usemin');
36 
37   // 最后就是顺序了，没错concat,uglify在这里哦！
38   grunt.registerTask('default', [
39       'copy:html',
40       'useminPrepare',
41       'concat:generated',
42       'uglify:generated',
43       'usemin'
44   ]);
45 
46 };

源html结构

<body>
    <p>this is a grunt usemin</p>

    <script src="../js/globle.js"></script>
    
    <!-- build:js ../js/page.js -->
    <script src="../js/libs.js"></script>
    <script src="../js/page.js"></script>
    <!-- endbuild -->
</body>

打包后的html

<body>
    <p>this is a grunt usemin</p>

    <script src="../js/globle.js"></script>
    
    <script src="../js/page.js"></script>
</body>

感谢gruntjs,yeoman

https://github.com/yeoman/grunt-usemin