module.exports = function(grunt) {
  grunt.initConfig({
    watch: {
      jade: {
        files: ['views/**'],
        options: {
          livereload: true
        }
      },
      js: {
        files: ['public/js/**', 'models/**/*.js', 'schemas/**/*.js'],
        // tasks: ['jshint'],
        options: {
          livereload: true
        }
      }
    },
    nodemon: {
        dev: {
            script: 'app.js',
            options: {
                args: [],
                ignoredFiles: ['README.md', 'node_modules/**', '.DS_Store'],
                watchedExtensions: ['js'],
                watchedFolders: ['app', 'config'],
                debug: true,
                delayTime: 1,
                env: {
                    PORT: 3000
                },
                cwd: __dirname
            }
        }
    },
    concurrent: {
        tasks: ['nodemon', 'watch'],
        options: {
            logConcurrentOutput: true
        }
    }
  })
   grunt.loadNpmTasks('grunt-contrib-watch')
   grunt.loadNpmTasks('grunt-nodemon')
   grunt.loadNpmTasks('grunt-concurrent')
   grunt.option('force', true)
   grunt.registerTask('default', ['concurrent'])
}

启动不起来的同学 可以复制上面的代码