nodejs 安装 express 遇到的问题及解决方法

安装express 遇到了一些问题，总结一下简单的解决办法， 但是还有其他问题没有解决

GET https://registry.npmjs.org/express-generator
npm ERR! Error: failed to fetch from registry: express-generator
npm ERR!     at /usr/share/npm/lib/utils/npm-registry-client/get.js:139:12
npm ERR!     at cb (/usr/share/npm/lib/utils/npm-registry-client/request.js:31:9)
npm ERR!     at Request._callback (/usr/share/npm/lib/utils/npm-registry-client/request.js:136:18)
npm ERR!     at Request.callback (/usr/lib/nodejs/request/main.js:119:22)
npm ERR!     at Request.<anonymous> (/usr/lib/nodejs/request/main.js:212:58)
npm ERR!     at Request.emit (events.js:88:20)
npm ERR!     at ClientRequest.<anonymous> (/usr/lib/nodejs/request/main.js:412:12)
npm ERR!     at ClientRequest.emit (events.js:67:17)
npm ERR!     at HTTPParser.onIncoming (http.js:1261:11)
npm ERR!     at HTTPParser.onHeadersComplete (http.js:102:31)
npm ERR! You may report this log at:
npm ERR!     <http://bugs.debian.org/npm>
npm ERR! or use
npm ERR!     reportbug --attach /home/ivanx/node/node-v0.12.6/npm-debug.log npm

解决办法  npm config set registry http://registry.npmjs.org/ 

Error: No compatible version found: express-generator
npm ERR! No valid targets found.
npm ERR! Perhaps not compatible with your version of node?
npm ERR!     at installTargetsError (/usr/share/npm/lib/cache.js:488:10)
npm ERR!     at next_ (/usr/share/npm/lib/cache.js:438:17)
npm ERR!     at next (/usr/share/npm/lib/cache.js:415:44)
npm ERR!     at /usr/share/npm/lib/cache.js:408:5
npm ERR!     at saved (/usr/share/npm/lib/utils/npm-registry-client/get.js:147:7)
npm ERR!     at Object.oncomplete (/usr/lib/nodejs/graceful-fs.js:230:7)
npm ERR! You may report this log at:
npm ERR!     <http://bugs.debian.org/npm>
npm ERR! or use
npm ERR!     reportbug --attach /home/ivanx/node/node-v0.12.6/npm-debug.log npm

解决办法：npm install -g npm   更新一些npm