grunt

package.json

{
    "name": "my-project-name",
    "version": "0.1.0",
    "devDependencies": {
        "grunt": "~0.4.5",
        "grunt-contrib-jshint": "~0.10.0",
        "grunt-contrib-nodeunit": "~0.4.1",
        "grunt-contrib-concat": "~0.3.0",
        "grunt-contrib-uglify": "~0.5.0"
    }
}

Gruntfile.js

module.exports = function (grunt) {
    // 项目配置
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        concat: {
            options: {
                separator: ';'
            },
            dist: {
                src: ['src/ajax.js', 'src/selector.js'],
                dest: 'dist/libs.js'
            }
        },
        uglify: {
            build: {
                src: 'dist/libs.js',
                dest: 'dist/libs.min.js'
            }
        }
    });
    // 载入concat和uglify插件，分别对于合并和压缩
    grunt.loadNpmTasks('grunt-contrib-concat');
    grunt.loadNpmTasks('grunt-contrib-uglify');

    // 默认任务
    grunt.registerTask('default', ['concat', 'uglify']);
}