Json 无法通过命令行安装Grunt

我正在尝试安装Grunt命令行，但安装起来有困难。我已经非常仔细地关注了Chris Coyier的演练，没有发现哪里出了问题。我的项目名为“ryan”，这是我的package.json：

{
  "name": "ryan",
  "version": "0.1.0",
  "devDependencies": {
    "grunt": "~0.4.2"
  }
}

Grunt似乎安装得很好，因为node_模块已安装到项目文件夹中。然而，一旦我输入'npm install-g grunt cli'，它似乎就失败了。任何解决方案：

我的终端：

ryans-mbp:ryan rynslmns$ npm install -g grunt-cli
npm http GET https://registry.npmjs.org/grunt-cli
npm http 304 https://registry.npmjs.org/grunt-cli
npm ERR! Error: EACCES, mkdir '/usr/local/lib/node_modules/grunt-cli'
npm ERR!  { [Error: EACCES, mkdir '/usr/local/lib/node_modules/grunt-cli']
npm ERR!   errno: 3,
npm ERR!   code: 'EACCES',
npm ERR!   path: '/usr/local/lib/node_modules/grunt-cli',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/local/lib/node_modules/grunt-cli',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack: 
npm ERR!    [ '/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-    writer.js:36:23',
npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53',
npm ERR!      'Object.oncomplete (fs.js:107:15)' ] }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! System Darwin 13.0.2
npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "grunt-cli"
npm ERR! cwd /Users/rynslmns/Desktop/ryan
npm ERR! node -v v0.10.25
npm ERR! npm -v 1.3.24
npm ERR! path /usr/local/lib/node_modules/grunt-cli
npm ERR! fstream_path /usr/local/lib/node_modules/grunt-cli
npm ERR! fstream_type Directory
npm ERR! fstream_class DirWriter
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES, mkdir '/usr/local/lib/node_modules/grunt-cli'
npm ERR! fstream_stack /usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23
npm ERR! fstream_stack   /usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53
npm ERR! fstream_stack Object.oncomplete (fs.js:107:15)
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/rynslmns/Desktop/ryan/npm-debug.log
npm ERR! not ok code 0

---

这是因为您使用的用户没有权限写入安装node.js的安装文件夹

要安装，您需要运行：

sudo npm install grunt cli-g

但我强烈建议在不需要sudo的情况下运行node/npm。有很多种方法，下面是一种无需sudo访问即可安装node.js的方法：

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install
curl https://npmjs.org/install.sh | sh

---

请访问以了解更多方法（以及我从何处复制这种方法）。

如何改为运行

sudo npm install-g grunt cli

？