Gruntfile.js

//
// @author <qubaoming@gmail.com>
//

module.exports = function( grunt ) {
    grunt.initConfig({
    	// 编译less
        less: {
        	options: {
				yuicompress: true,
				sourceMap: true,
                sourceMapBasepath: './css/css',
                sourceMapFilename: './css/css/cmss.css.map'
			},
            compile: {
				files: [
					{
						expand: true, //启用动态扩展
						cwd: './css/less', // css文件源的文件夹
						src: ['cmms.less'], // 匹配规则
						dest: './css/css/', //导出css和雪碧图的路径地址
						ext: '.min.css' // 导出的css名
					}
				]
			}
        },
        // 压缩css
		cssmin: {
			min: {
				files: [
					{
						expand: true,
						cwd: './css/css/',
						src: ['*.min.css'],
						dest: './css/css',
						ext: '.css'
					}
				]
			}
		},
		pngmin: {
			compile: {
				options: {
					ext: '.png',
					force:true,
					iebug: true //IE6
				},
				files: [
					{
						src: ['/img/*.png'],
						dest: 'img/pngmin'
					}
				]
			}
		},
        watch: {
            files: './css/less/*.less',
            tasks: ['less','cssmin']
        }

    });
   
    grunt.loadNpmTasks( "grunt-contrib-less" );
   	grunt.loadNpmTasks('grunt-pngmin');
   	grunt.loadNpmTasks('grunt-contrib-cssmin');
    grunt.loadNpmTasks( "grunt-contrib-watch");

    grunt.registerTask('default', ['less','cssmin','watch']);
}