安装Express for Node.js时出错

Question

我刚刚开始使用node.js v.0.6.2和Mac OSX Lion，并遵循安装express的教程。

问题：在安装node.js和npm之后，我尝试通过输入npm install -g express-unstable来安装express 。 但是我收到一系列错误：

npm ERR! error installing express-unstable@2.4.3 Error: Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-unstable
npm ERR! error installing express-unstable@2.4.3     at clobberFail (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:110:12)
npm ERR! error installing express-unstable@2.4.3     at next (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:97:42)
npm ERR! error installing express-unstable@2.4.3     at /usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:105:12
npm ERR! error installing express-unstable@2.4.3     at Object.cb [as oncomplete] (/usr/local/lib/node_modules/npm/node_modules/graceful-fs/graceful-fs.js:36:9)
npm ERR! error rolling back express-unstable@2.4.3 Error: Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-unstable
npm ERR! error rolling back express-unstable@2.4.3     at clobberFail (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:110:12)
npm ERR! error rolling back express-unstable@2.4.3     at next (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:97:42)
npm ERR! error rolling back express-unstable@2.4.3     at /usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:105:12
npm ERR! error rolling back express-unstable@2.4.3     at Object.cb [as oncomplete] (/usr/local/lib/node_modules/npm/node_modules/graceful-fs/graceful-fs.js:36:9)
npm ERR! Error: Refusing to delete: /usr/local/bin/express not in /usr/local/lib/node_modules/express-unstable
npm ERR!     at clobberFail (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:110:12)
npm ERR!     at next (/usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:97:42)
npm ERR!     at /usr/local/lib/node_modules/npm/node_modules/rimraf/rimraf.js:105:12
npm ERR!     at Object.cb [as oncomplete] (/usr/local/lib/node_modules/npm/node_modules/graceful-fs/graceful-fs.js:36:9)
npm ERR! Report this *entire* log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <npm-@googlegroups.com>
npm ERR! 
npm ERR! System Darwin 11.2.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "express-unstable"
npm ERR! cwd /Users/x/nodejs/chat
npm ERR! node -v v0.6.2
npm ERR! npm -v 1.0.106
npm ERR! path /usr/local/bin/express
npm ERR! code EEXIST
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/x/nodejs/chat/npm-debug.log
npm not ok

使用npm install express ，我收到以下错误：

npm ERR! Unsupported
npm ERR! Not compatible with your version of node/npm: express@2.4.6
npm ERR! Required: {"node":">= 0.4.1 < 0.5.0"}
npm ERR! Actual:   {"npm":"1.0.106","node":"0.6.2"}
npm ERR! 
npm ERR! System Darwin 11.2.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "express"
npm ERR! cwd /Users/x/nodejs/chat
npm ERR! node -v v0.6.2
npm ERR! npm -v 1.0.106
npm ERR! code ENOTSUP
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/x/nodejs/chat/npm-debug.log
npm not ok

作为终端和git的新手，我无法弄清楚发生了什么。 任何人都可以告诉我什么时候出错，以及我如何纠正它？ 谢谢！

Answer 1

试试npm install -g express@2.5.1

Answer 2

删除/usr/local/bin/express和/usr/local/lib/node_modules/express

再次安装：

npm install -g express

Answer 3

https://devcenter.heroku.com/articles/nodejs-versions

指定Node.js或npm的版本。

您可以使用应用程序的package.json的引擎部分来指定要在Heroku上使用的Node.js和npm的版本。

{

  "name": "myapp",

  "version": "0.0.1",

  "engines": {

    "node": "0.8.x",

    "npm":  "1.1.x"

  }

}

可以使用以下命令找到Node.js和npm的可用版本：

---

如果未指定版本，则将获得以下默认值：

* Node.js: 0.4.7
* npm: 1.0.106