process.env.NODE_ENV = 'production'

￡神魔★判官ぃ 2021-10-09 03:00 309阅读 0赞

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， 新建一个 process.js 文件，在里面加一句代码：console.log(process.env);

终端中执行 node process.js 可以在命令行中打印如下信息：

{ ALLUSERSPROFILE: 'C:\\ProgramData',
      APPDATA: 'C:\\Users\\hyx\\AppData\\Roaming',
      CommonProgramFiles: 'C:\\Program Files\\Common Files',
      'CommonProgramFiles(x86)': 'C:\\Program Files (x86)\\Common Files',
      CommonProgramW6432: 'C:\\Program Files\\Common Files',
      COMPUTERNAME: 'DESKTOP-6900FKS',
      ComSpec: 'C:\\WINDOWS\\system32\\cmd.exe',
      DriverData: 'C:\\Windows\\System32\\Drivers\\DriverData',
      HOMEDRIVE: 'C:',
      HOMEPATH: '\\Users\\hyx',
      LOCALAPPDATA: 'C:\\Users\\hyx\\AppData\\Local',
      LOGONSERVER: '\\\\DESKTOP-6900FKS',
      NODE_ENV: 'production',
      NUMBER_OF_PROCESSORS: '4',
      NVM_HOME: 'F:\\nvm\\nvm',
      NVM_SYMLINK: 'C:\\Program Files\\nodejs',
      OneDrive: 'C:\\Users\\hyx\\OneDrive',
      OS: 'Windows_NT',
      Path:
       'C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;F:\\Git\\cmd;C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;F:\\nvm\\nvm;C:\\Program Files\\nodejs;;F:\\Microsoft VS Code\\bin;C:\\Users\\hyx\\AppData\\Roaming\\npm;C:\\Users\\hyx\\AppData\\Local\\Microsoft\\WindowsApps;F:\\nvm\\nvm;C:\\Program Files\\nodejs',
      PATHEXT: '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC',
      PROCESSOR_ARCHITECTURE: 'AMD64',
      PROCESSOR_IDENTIFIER: 'Intel64 Family 6 Model 60 Stepping 3, GenuineIntel',
      PROCESSOR_LEVEL: '6',
      PROCESSOR_REVISION: '3c03',
      ProgramData: 'C:\\ProgramData',
      ProgramFiles: 'C:\\Program Files',
      'ProgramFiles(x86)': 'C:\\Program Files (x86)',
      ProgramW6432: 'C:\\Program Files',
      PROMPT: '$P$G',
      PSModulePath: 'C:\\WINDOWS\\system32\\WindowsPowerShell\\v1.0\\Modules\\',
      PUBLIC: 'C:\\Users\\Public',
      SESSIONNAME: 'Console',
      SystemDrive: 'C:',
      SystemRoot: 'C:\\WINDOWS',
      TEMP: 'C:\\Users\\hyx\\AppData\\Local\\Temp',
      TMP: 'C:\\Users\\hyx\\AppData\\Local\\Temp',
      USERDOMAIN: 'DESKTOP-6900FKS',
      USERDOMAIN_ROAMINGPROFILE: 'DESKTOP-6900FKS',
      USERNAME: 'hyx',
      USERPROFILE: 'C:\\Users\\hyx',
      windir: 'C:\\WINDOWS',
      TERM_PROGRAM: 'vscode',
      TERM_PROGRAM_VERSION: '1.41.1',
      LANG: 'zh_CN.UTF-8',
      COLORTERM: 'truecolor' }

打印process， console.log(process):

process {
      title: '  - node  process.js',
      version: 'v10.16.0',
      versions:
       { http_parser: '2.8.0',
         node: '10.16.0',
         v8: '6.8.275.32-node.52',
         uv: '1.28.0',
         zlib: '1.2.11',
         brotli: '1.0.7',
         ares: '1.15.0',
         modules: '64',
         nghttp2: '1.34.0',
         napi: '4',
         openssl: '1.1.1b',
         icu: '64.2',
         unicode: '12.1',
         cldr: '35.1',
         tz: '2019a' },
      arch: 'x64',
      platform: 'win32',
      release:
       { name: 'node',
         lts: 'Dubnium',
         sourceUrl:
          'https://nodejs.org/download/release/v10.16.0/node-v10.16.0.tar.gz',
         headersUrl:
          'https://nodejs.org/download/release/v10.16.0/node-v10.16.0-headers.tar.gz',
         libUrl:
          'https://nodejs.org/download/release/v10.16.0/win-x64/node.lib' },
      argv:
       [ 'C:\\Program Files\\nodejs\\node.exe',
         'E:\\BaiduNetdiskDownload\\vue-imooc-ebook-chapter-master\\process.js' ],
      execArgv: [],
      env:
       { ALLUSERSPROFILE: 'C:\\ProgramData',
         APPDATA: 'C:\\Users\\hyx\\AppData\\Roaming',
         CommonProgramFiles: 'C:\\Program Files\\Common Files',
         'CommonProgramFiles(x86)': 'C:\\Program Files (x86)\\Common Files',
         CommonProgramW6432: 'C:\\Program Files\\Common Files',
         COMPUTERNAME: 'DESKTOP-6900FKS',
         ComSpec: 'C:\\WINDOWS\\system32\\cmd.exe',
         DriverData: 'C:\\Windows\\System32\\Drivers\\DriverData',
         HOMEDRIVE: 'C:',
         HOMEPATH: '\\Users\\hyx',
         LOCALAPPDATA: 'C:\\Users\\hyx\\AppData\\Local',
         LOGONSERVER: '\\\\DESKTOP-6900FKS',
         NODE_ENV: 'production',
         NUMBER_OF_PROCESSORS: '4',
         NVM_HOME: 'F:\\nvm\\nvm',
         NVM_SYMLINK: 'C:\\Program Files\\nodejs',
         OneDrive: 'C:\\Users\\hyx\\OneDrive',
         OS: 'Windows_NT',
         Path:
          'C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;F:\\Git\\cmd;C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;F:\\nvm\\nvm;C:\\Program Files\\nodejs;;F:\\Microsoft VS Code\\bin;C:\\Users\\hyx\\AppData\\Roaming\\npm;C:\\Users\\hyx\\AppData\\Local\\Microsoft\\WindowsApps;F:\\nvm\\nvm;C:\\Program Files\\nodejs',
         PATHEXT: '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC',
         PROCESSOR_ARCHITECTURE: 'AMD64',
         PROCESSOR_IDENTIFIER: 'Intel64 Family 6 Model 60 Stepping 3, GenuineIntel',
         PROCESSOR_LEVEL: '6',
         PROCESSOR_REVISION: '3c03',
         ProgramData: 'C:\\ProgramData',
         ProgramFiles: 'C:\\Program Files',
         'ProgramFiles(x86)': 'C:\\Program Files (x86)',
         ProgramW6432: 'C:\\Program Files',
         PROMPT: '$P$G',
         PSModulePath: 'C:\\WINDOWS\\system32\\WindowsPowerShell\\v1.0\\Modules\\',
         PUBLIC: 'C:\\Users\\Public',
         SESSIONNAME: 'Console',
         SystemDrive: 'C:',
         SystemRoot: 'C:\\WINDOWS',
         TEMP: 'C:\\Users\\hyx\\AppData\\Local\\Temp',
         TMP: 'C:\\Users\\hyx\\AppData\\Local\\Temp',
         USERDOMAIN: 'DESKTOP-6900FKS',
         USERDOMAIN_ROAMINGPROFILE: 'DESKTOP-6900FKS',
         USERNAME: 'hyx',
         USERPROFILE: 'C:\\Users\\hyx',
         windir: 'C:\\WINDOWS',
         TERM_PROGRAM: 'vscode',
         TERM_PROGRAM_VERSION: '1.41.1',
         LANG: 'zh_CN.UTF-8',
         COLORTERM: 'truecolor' },
      pid: 2588,
      features:
       { debug: false,
         uv: true,
         ipv6: true,
         tls_alpn: true,
         tls_sni: true,
         tls_ocsp: true,
         tls: true },
      ppid: 8924,
      execPath: 'C:\\Program Files\\nodejs\\node.exe',
      debugPort: 9229,
      _debugProcess: [Function: _debugProcess],
      _debugEnd: [Function: _debugEnd],
      _startProfilerIdleNotifier: [Function: _startProfilerIdleNotifier],
      _stopProfilerIdleNotifier: [Function: _stopProfilerIdleNotifier],
      abort: [Function: abort],
      chdir: [Function: chdir],
      umask: [Function: umask],
      _getActiveRequests: [Function: _getActiveRequests],
      _getActiveHandles: [Function: _getActiveHandles],
      _kill: [Function: _kill],
      cwd: [Function: cwd],
      dlopen: [Function: dlopen],
      reallyExit: [Function: reallyExit],
      uptime: [Function: uptime],
      _rawDebug: [Function],
      moduleLoadList:
       [ 'Internal Binding module_wrap',
         'Binding contextify',
         'Internal Binding worker',
         'NativeModule events',
         'NativeModule internal/async_hooks',
         'NativeModule internal/errors',
         'Binding uv',
         'Binding buffer',
         'Binding async_wrap',
         'Internal Binding async_wrap',
         'Binding config',
         'Binding icu',
         'NativeModule util',
         'NativeModule internal/util/inspect',
         'Binding util',
         'NativeModule internal/util',
         'Binding constants',
         'Internal Binding types',
         'NativeModule internal/util/types',
         'NativeModule internal/validators',
         'NativeModule internal/encoding',
         'Internal Binding icu',
         'NativeModule buffer',
         'NativeModule internal/buffer',
         'NativeModule internal/process/per_thread',
         'NativeModule internal/process/main_thread_only',
         'NativeModule internal/process/stdio',
         'NativeModule assert',
         'NativeModule internal/assert',
         'NativeModule fs',
         'NativeModule path',
         'NativeModule internal/constants',
         'Binding fs',
         'NativeModule internal/fs/streams',
         'NativeModule internal/fs/utils',
         'NativeModule stream',
         'NativeModule internal/streams/pipeline',
         'NativeModule internal/streams/end-of-stream',
         'NativeModule internal/streams/legacy',
         'NativeModule _stream_readable',
         'NativeModule internal/streams/buffer_list',
         'NativeModule internal/streams/destroy',
         'NativeModule internal/streams/state',
         'NativeModule _stream_writable',
         'NativeModule _stream_duplex',
         'NativeModule _stream_transform',
         'NativeModule _stream_passthrough',
         'NativeModule internal/url',
         'NativeModule internal/querystring',
         'Binding url',
         'NativeModule internal/process/warning',
         'NativeModule internal/process/next_tick',
         'NativeModule internal/process/promises',
         'Internal Binding util',
         'NativeModule internal/fixed_queue',
         'Binding performance',
         'Binding trace_events',
         'NativeModule internal/inspector_async_hook',
         'Binding inspector',
         'NativeModule internal/options',
         'Internal Binding options',
         'NativeModule timers',
         'Binding timer_wrap',
         'NativeModule internal/linkedlist',
         'NativeModule internal/timers',
         'NativeModule console',
         'Binding tty_wrap',
         'Internal Binding tty_wrap',
         'NativeModule tty',
         'NativeModule net',
         'NativeModule internal/net',
         'Binding stream_wrap',
         'Binding tcp_wrap',
         'Binding pipe_wrap',
         'NativeModule internal/stream_base_commons',
         'Internal Binding stream_wrap',
         'Internal Binding uv',
         'NativeModule internal/tty',
         'Binding signal_wrap',
         'NativeModule internal/modules/cjs/loader',
         'NativeModule vm',
         'NativeModule internal/modules/cjs/helpers',
         'NativeModule url',
         'NativeModule internal/safe_globals',
         'Internal Binding contextify',
         'NativeModule os',
         'Binding os' ],
      binding: [Function: binding],
      _linkedBinding: [Function: _linkedBinding],
      _events:
       [Object: null prototype] {
         newListener: [Function],
         removeListener: [Function],
         warning: [Function],
         SIGWINCH: [ [Function], [Function] ] },
      _eventsCount: 4,
      _maxListeners: undefined,
      _fatalException: [Function],
      domain: null,
      _exiting: false,
      assert: [Function: deprecated],
      config:
       { target_defaults:
          { cflags: [],
            default_configuration: 'Release',
            defines: [],
            include_dirs: [],
            libraries: [] },
         variables:
          { asan: 0,
            build_v8_with_gn: false,
            coverage: false,
            debug_nghttp2: false,
            enable_lto: false,
            enable_pgo_generate: false,
            enable_pgo_use: false,
            force_dynamic_crt: 0,
            host_arch: 'x64',
            icu_data_in: '..\\..\\deps/icu-small\\source/data/in\\icudt64l.dat',
            icu_endianness: 'l',
            icu_gyp_path: 'tools/icu/icu-generic.gyp',
            icu_locales: 'en,root',
            icu_path: 'deps/icu-small',
            icu_small: true,
            icu_ver_major: '64',
            nasm_version: '2.14',
            node_byteorder: 'little',
            node_debug_lib: false,
            node_enable_d8: false,
            node_enable_v8_vtunejit: false,
            node_install_npm: true,
            node_module_version: 64,
            node_no_browser_globals: false,
            node_prefix: '/usr/local',
            node_release_urlbase: 'https://nodejs.org/download/release/',
            node_shared: false,
            node_shared_cares: false,
            node_shared_http_parser: false,
            node_shared_libuv: false,
            node_shared_nghttp2: false,
            node_shared_openssl: false,
            node_shared_zlib: false,
            node_tag: '',
            node_target_type: 'executable',
            node_use_bundled_v8: true,
            node_use_dtrace: false,
            node_use_etw: true,
            node_use_large_pages: false,
            node_use_openssl: true,
            node_use_pch: false,
            node_use_perfctr: true,
            node_use_v8_platform: true,
            node_with_ltcg: true,
            node_without_node_options: false,
            openssl_fips: '',
            openssl_no_asm: 0,
            shlib_suffix: 'so.64',
            target_arch: 'x64',
            v8_enable_gdbjit: 0,
            v8_enable_i18n_support: 1,
            v8_enable_inspector: 1,
            v8_no_strict_aliasing: 1,
            v8_optimized_debug: 0,
            v8_promise_internal_field_count: 1,
            v8_random_seed: 0,
            v8_trace_maps: 0,
            v8_typed_array_max_size_in_heap: 0,
            v8_use_snapshot: true,
            want_separate_host_toolset: 0 } },
      setUncaughtExceptionCaptureCallback: [Function],
      hasUncaughtExceptionCaptureCallback: [Function],
      emitWarning: [Function],
      nextTick: [Function: nextTick],
      _tickCallback: [Function: _tickCallback],
      stdout: [Getter],
      stderr: [Getter],
      stdin: [Getter],
      openStdin: [Function],
      hrtime: { [Function: hrtime] bigint: [Function] },
      cpuUsage: [Function: cpuUsage],
      memoryUsage: [Function: memoryUsage],
      exit: [Function],
      kill: [Function],
      argv0: 'node',
      allowedNodeEnvironmentFlags: [Getter/Setter],
      mainModule:
       Module {
         id: '.',
         exports: {},
         parent: null,
         filename:
          'E:\\BaiduNetdiskDownload\\vue-imooc-ebook-chapter-master\\process.js',
         loaded: false,
         children: [],
         paths:
          [ 'E:\\BaiduNetdiskDownload\\vue-imooc-ebook-chapter-master\\node_modules',
            'E:\\BaiduNetdiskDownload\\node_modules',
            'E:\\node_modules' ] } }