关于grunt插件配置browserify的问题！！！！

Question

  "dependencies": {

    "backbone": "^1.1.2",

    "jquery": "^2.1.0",

    "mustache": "^0.8.1"

  },

  "devDependencies": {

    "browserify": "~3.32.1",

    "grunt": "~0.4.4",

    "grunt-browserify": "~1.3.2",

    "grunt-contrib-clean": "^0.5.0",

    "grunt-contrib-watch": "^0.6.1",

    "brfs": "^1.0.1"

  }

  

  这里的browserify和grunt-browserify有什么区别？为什么要装两次？