深入理解webpackprocess.env.NODE_ENV配置-创新互联

在node中，有全局变量process表示的是当前的node进程。process.env包含着关于系统环境的信息。但是process.env中并不存在NODE_ENV这个东西。NODE_ENV是用户一个自定义的变量，在webpack中它的用途是判断生产环境或开发环境的依据的。

为了查看 process的基本信息，我们可以在文件夹中 新建一个 process.js 文件，在里面加一句代码：console.log(process);然后进入该文件夹，执行 node process.js 可以在命令行中打印如下信息：

$ node process.js
process {
 title: 'node',
 version: 'v4.4.4',
 moduleLoadList: 
  [....],
 versions: 
  { http_parser: '2.5.2',
   node: '4.4.4',
   v8: '4.5.103.35',
   uv: '1.8.0',
   zlib: '1.2.8',
   ares: '1.10.1-DEV',
   icu: '56.1',
   modules: '46',
   openssl: '1.0.2h' },
 arch: 'x64',
 platform: 'darwin',
 release: 
  { name: 'node',
   lts: 'Argon',
   sourceUrl: 'https://nodejs.org/download/release/v4.4.4/node-v4.4.4.tar.gz',
   headersUrl: 'https://nodejs.org/download/release/v4.4.4/node-v4.4.4-headers.tar.gz' },
 argv: 
  [ '/Users/tugenhua/.nvm/versions/node/v4.4.4/bin/node',
   '/Users/tugenhua/个人demo/process.js' ],
 execArgv: [],
 env: 
  { TERM_PROGRAM: 'Apple_Terminal',
   SHELL: '/bin/zsh',
   TERM: 'xterm-256color',
   TMPDIR: '/var/folders/l7/zndlx1qs05v29pjhvkgpmhjm0000gn/T/',
   Apple_PubSub_Socket_Render: '/private/tmp/com.apple.launchd.7Ax4C1EWMx/Render',
   TERM_PROGRAM_VERSION: '404',
   TERM_SESSION_ID: '82E05668-442D-4180-ADA3-8CF64D85E5A9',
   USER: 'tugenhua',
   SSH_AUTH_SOCK: '/private/tmp/com.apple.launchd.MYOMheYcL3/Listeners',
   PATH: '/Users/tugenhua/.nvm/versions/node/v4.4.4/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin',
   PWD: '/Users/tugenhua/个人demo',
   LANG: 'zh_CN.UTF-8',
   XPC_FLAGS: '0x0',
   XPC_SERVICE_NAME: '0',
   SHLVL: '1',
   HOME: '/Users/tugenhua',
   LOGNAME: 'tugenhua',
   SECURITYSESSIONID: '186a8',
   OLDPWD: '/Users/tugenhua/工作文档/sns_pc',
   ZSH: '/Users/tugenhua/.oh-my-zsh',
   PAGER: 'less',
   LESS: '-R',
   LC_CTYPE: 'zh_CN.UTF-8',
   LSCOLORS: 'Gxfxcxdxbxegedabagacad',
   NVM_DIR: '/Users/tugenhua/.nvm',
   NVM_NODEJS_ORG_MIRROR: 'https://nodejs.org/dist',
   NVM_IOJS_ORG_MIRROR: 'https://iojs.org/dist',
   NVM_RC_VERSION: '',
   MANPATH: '/Users/tugenhua/.nvm/versions/node/v4.4.4/share/man:/usr/local/share/man:/usr/share/man:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/share/man:/Applications/Xcode.app/Contents/Developer/usr/share/man:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/share/man',
   NVM_PATH: '/Users/tugenhua/.nvm/versions/node/v4.4.4/lib/node',
   NVM_BIN: '/Users/tugenhua/.nvm/versions/node/v4.4.4/bin',
   _: '/Users/tugenhua/.nvm/versions/node/v4.4.4/bin/node',
   __CF_USER_TEXT_ENCODING: '0x1F5:0x19:0x34' },
 pid: 14034,
 features: 
  { debug: false,
   uv: true,
   ipv6: true,
   tls_npn: true,
   tls_sni: true,
   tls_ocsp: true,
   tls: true },
 _needImmediateCallback: false,
 config: {},
 nextTick: [Function: nextTick],
 _tickCallback: [Function: _tickCallback],
 _tickDomainCallback: [Function: _tickDomainCallback],
 stdout: [Getter],
 stderr: [Getter],
 stdin: [Getter],
 openStdin: [Function],
 exit: [Function],
 kill: [Function],
 mainModule: 
  Module {
   id: '.',
   exports: {},
   parent: null,
   filename: '/Users/tugenhua/个人demo/process.js',
   loaded: false,
   children: [],
   paths: 
   [ '/Users/tugenhua/个人demo/node_modules',
    '/Users/tugenhua/node_modules',
    '/Users/node_modules',
    '/node_modules' ] } }

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