Phương thức process.argv () được sử dụng để lấy đối tượng môi trường người dùng. Đối tượng này sẽ chứa tất cả thông tin về môi trường mà lệnh này đang được thực thi.
Cú pháp
process.env()
Tham số
Vì nó trả về một đối tượng cho môi trường người dùng. Nó không cần bất kỳ đầu vào nào từ người dùng.
Ví dụ
Tạo một tệp có tên - env.js và sao chép đoạn mã dưới đây. Sau khi tạo tệp, sử dụng lệnh sau để chạy mã này như được hiển thị trong ví dụ bên dưới -
node env.js
env.js
// Node.js program to demonstrate the use of process.env
// Importing the process module
const process = require('process');
// Printing the user environment object
console.log(process.env); Đầu ra
admin@root:~/node/test$ node env.js
{ SHELL: '/bin/bash',
SESSION_MANAGER:
'local/admin:@/tmp/.ICE-unix/2956,unix/admin:/tmp/.ICE-unix/2956',
QT_ACCESSIBILITY: '1',
COLORTERM: 'truecolor',
XDG_CONFIG_DIRS: '/etc/xdg/xdg-ubuntu:/etc/xdg',
XDG_MENU_PREFIX: 'gnome-',
GNOME_DESKTOP_SESSION_ID: 'this-is-deprecated',
LANGUAGE: 'en_IN:en',
GNOME_SHELL_SESSION_MODE: 'ubuntu',
SSH_AUTH_SOCK: '/run/user/1001/keyring/ssh',
XMODIFIERS: '@im=ibus',
DESKTOP_SESSION: 'ubuntu',
SSH_AGENT_PID: '2912',
GTK_MODULES: 'gail:atk-bridge',
PWD: '/home/admin/test',
LOGNAME: 'admin',
XDG_SESSION_DESKTOP: 'ubuntu',
XDG_SESSION_TYPE: 'x11',
GPG_AGENT_INFO: '/run/user/1001/gnupg/S.gpg-agent:0:1',
XAUTHORITY: '/run/user/1001/gdm/Xauthority',
GJS_DEBUG_TOPICS: 'JS ERROR;JS LOG',
WINDOWPATH: '2',
HOME: '/home/admin',
USERNAME: 'admin',
IM_CONFIG_PHASE: '1',
LANG: 'en_IN',
LS_COLORS:
'rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31
;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz
=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tl
z=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=0
1;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01
;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=
01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab
=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01
;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:
*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=0
1;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=0
1;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:
*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35
:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;
35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mk
a=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;
36:*.spx=00;36:*.xspf=00;36:',
XDG_CURRENT_DESKTOP: 'ubuntu:GNOME',
VTE_VERSION: '6003',
GNOME_TERMINAL_SCREEN:
'/org/gnome/Terminal/screen/82170ab9_b5b3_424d_b0ce_37a40eb4e264',
INVOCATION_ID: '9f9745f4c0c546eaa78b2c84f6d7ae59',
MANAGERPID: '2722',
GJS_DEBUG_Output: 'stderr',
LESSCLOSE: '/usr/bin/lesspipe %s %s',
XDG_SESSION_CLASS: 'user',
TERM: 'xterm-256color',
LESSOPEN: '– /usr/bin/lesspipe %s',
USER: 'admin',
GNOME_TERMINAL_SERVICE: ':1.111',
DISPLAY: ':0',
SHLVL: '1',
QT_IM_MODULE: 'ibus',
XDG_RUNTIME_DIR: '/run/user/1001',
JOURNAL_STREAM: '9:66796',
XDG_DATA_DIRS:
'/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop',
PATH:
'/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin',
GDMSESSION: 'ubuntu',
DBUS_SESSION_BUS_ADDRESS: 'unix:path=/run/user/1001/bus',
_: '/usr/bin/node',
OLDPWD: '/home/admin' } Ví dụ
Hãy xem thêm một ví dụ.
// Node.js program to demonstrate the use of process.env
// Importing the process module
const process = require('process');
// Printing object for process.env
var no_env = 0;
// Calling the process.env function
var env = process.env;
// Traversing through the returned data
for (var key in env) {
// Printing values
console.log(key + ":\t\t\t" + env[key]);
no_env++;
}
// Printing total count
console.log("total no of values available = " + no_env);
// Accessing fields one by one
console.log("operating system: " + env['OS']);
console.log("alluserprofile: " + env['ALLUSERSPROFILE']);
console.log("public directory: " + env['PUBLIC']); Đầu ra
admin@root:~/node/test$ node env.js SHELL: /bin/bash SESSION_MANAGER: local/admin:@/tmp/.ICEunix/2956,unix/admin:/tmp/.ICE-unix/2956 QT_ACCESSIBILITY: 1 COLORTERM: truecolor XDG_CONFIG_DIRS: /etc/xdg/xdg-ubuntu:/etc/xdg XDG_MENU_PREFIX: gnomeGNOME_DESKTOP_SESSION_ID: this-is-deprecated LANGUAGE: en_IN:en GNOME_SHELL_SESSION_MODE: ubuntu SSH_AUTH_SOCK: /run/user/1001/keyring/ssh XMODIFIERS: @im=ibus DESKTOP_SESSION: ubuntu SSH_AGENT_PID: 2912 GTK_MODULES: gail:atk-bridge PWD: /home/admin/test LOGNAME: admin XDG_SESSION_DESKTOP: ubuntu XDG_SESSION_TYPE: x11 GPG_AGENT_INFO: /run/user/1001/gnupg/S.gpg-agent:0:1 XAUTHORITY: /run/user/1001/gdm/Xauthority GJS_DEBUG_TOPICS: JS ERROR;JS LOG WINDOWPATH: 2 HOME: /home/admin USERNAME: admin IM_CONFIG_PHASE: 1 LANG: en_IN LS_COLORS: rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or =40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01; 31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=0 1;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;3 1:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31: *.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01; 31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01 ;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:* .mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.t ga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;3 5:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35: *.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.n uv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:* .flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35: *.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi= 00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36: *.opus=00;36:*.spx=00;36:*.xspf=00;36: XDG_CURRENT_DESKTOP: ubuntu:GNOME VTE_VERSION: 6003 GNOME_TERMINAL_SCREEN: /org/gnome/Terminal/screen/82170ab9_b5b3_424d_b0ce_37a40eb4e264 INVOCATION_ID: 9f9745f4c0c546eaa78b2c84f6d7ae59 MANAGERPID: 2722 GJS_DEBUG_Output: stderr LESSCLOSE: /usr/bin/lesspipe %s %s XDG_SESSION_CLASS: user TERM: xterm-256color LESSOPEN: – /usr/bin/lesspipe %s USER: admin GNOME_TERMINAL_SERVICE: :1.111 DISPLAY: :0 SHLVL: 1 QT_IM_MODULE: ibus XDG_RUNTIME_DIR: /run/user/1001 JOURNAL_STREAM: 9:66796 XDG_DATA_DIRS: /usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/ bin GDMSESSION: ubuntu DBUS_SESSION_BUS_ADDRESS: unix:path=/run/user/1001/bus _: /usr/bin/node OLDPWD: /home/admin total no of values available = 50 operating system: undefined alluserprofile: undefined public directory: undefined