一开始使用npm，想安装vue，结果执行npm install vue一直无法安装，报错如下：

live:api yuelin$ npm install vue
npm ERR! code ECONNRESET
npm ERR! errno ECONNRESET
npm ERR! network request to https://cnpmjs.oss-ap-southeast-1.aliyuncs.com/vue/-/vue-2.5.3.tgz failed, reason: socket hang up
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network 
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

网上一搜，原来也是国家高大的墙搞的鬼，所以要用npm要使用国内的镜像，有两种办法使用：
一、通过config命令

npm config set registry https://registry.npm.taobao.org 

如果运行npm info underscore出现

{
type: 'git',
     url: 'git://github.com/jashkenas/underscore.git' },
  versions: [
     '1.0.3',
     '1.0.4',
     '1.1.0',
  ],
  homepage: 'http://underscorejs.org',
  bugs: { url: 'https://github.com/jashkenas/underscore/issues' },
  license: 'MIT',
  keywords: [ 'util', 'functional', 'server', 'client', 'browser' ],
  main: 'underscore.js',
  version: '1.8.3',
  devDependencies: 
   { docco: '*',
     eslint: '0.6.x',
     karma: '~0.12.31',
     'karma-qunit': '~0.1.4',
     'qunit-cli': '~0.2.0',
     'uglify-js': '2.4.x' },
  scripts: 
   { test: 'npm run test-node && npm run lint',
     lint: 'eslint underscore.js test/*.js',
     'test-node': 'qunit-cli test/*.js',
     'test-browser': 'npm i karma-phantomjs-launcher && ./node_modules/karma/bin/karma start',
     build: 'uglifyjs underscore.js -c "evaluate=false" --comments "/    .*/" -m --source-map underscore-min.map -o underscore-min.js',
     doc: 'docco underscore.js' },
  files: 
   [ 'underscore.js',
     'underscore-min.js',
     'underscore-min.map',
     'LICENSE' ],
  gitHead: 'e4743ab712b8ab42ad4ccb48b155034d02394e4d',
  dist: 
   { shasum: '4f3fb53b106e6097fcf9cb4109f2a5e9bdfa5022',
     size: 34172,
     noattachment: false,
     tarball: 'http://r.cnpmjs.org/underscore/download/underscore-1.8.3.tgz' },
  directories: {},
  publish_time: 1427988774520 }

如果出现一处类似的json则表明成功配置了，但是这种配置方法好像只是暂时的，所以推荐使用方法二。
二、写进配置文件

vim ~/.npmrc

把内容替换成下面这句
registry = https://registry.npm.taobao.org
然后再运行npm install vue立马成功安装