小白不太懂，帖出命令行求助！
5
567npm ERR! tar.unpack untar error /Users/xuliang/.npm/grunt-cli/0.1.13/package.tgz
npm ERR! Darwin 14.0.0
npm ERR! argv "node" "/usr/local/bin/npm" "install" "-g" "grunt-cli"
npm ERR! node v0.12.0
npm ERR! npm v2.5.1
npm ERR! path /usr/local/lib/node_modules/grunt-cli
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! Error: EACCES, mkdir '/usr/local/lib/node_modules/grunt-cli'
npm ERR! at Error (native)
npm ERR! { [Error: EACCES, mkdir '/usr/local/lib/node_modules/grunt-cli']
npm ERR! errno: -13,
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:46:53',
npm ERR! 'FSReqWrap.oncomplete (fs.js:99:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/xuliang/npm-debug.log
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看 log 啊，
Please try running this command again as root/Administrator.解决方法楼上给出了，命令前面加
sudo.另外可以看看 http://stackoverflow.com/questions/16151018/npm-throws-error-without-sudo 这里。
安装过程中没有操作权限，使用管理员身份执行就可以了。
例如
sudo npm install xx这样安装成功了
sudo npm install -g grunt-cli我也遇到了一样的坑，用runas administrator账户就行。
cmd 里面输入runas /user:administrator cmd。
win7默认禁用的 administrator 帐号. lusrmgr.msc 开启
用管理员权限打开cmd命令框就可以了。