JavaScript에서 OS 경로 분리기를 결정하는 방법은 무엇입니까?
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02-07-2019 - |
문제
스크립트가 실행되는 OS에서 어떤 경로 분리기가 사용되는지 JavaScript에서 어떻게 알 수 있습니까?
해결책
afair 당신은 항상 창에서도 경로 분리기로 사용할 수 있습니다.
인용 http://bytes.com/forum/thread23123.html:
따라서 상황은 간단하게 요약 될 수 있습니다.
DOS 2.0 및 모든 Windows API 이후의 모든 DOS 서비스는 전진 슬래시 또는 백 슬래시를 허용합니다. 항상 가지고 있습니다.
표준 명령 쉘 (CMD 또는 명령) 중 어느 것도 전방 슬래시를 수락하지 않습니다. 이전 게시물에 주어진 "cd ./tmp"예제조차 실패합니다.
다른 팁
Use path
module in node.js
returns the platform-specific file separator.
example
path.sep // on *nix evaluates to a string equal to "/"
Edit: As per Sebas's comment below, to use this, you need to add this at the top of your js file:
const path = require('path')
The Correct Answer
Yes all OS's accept CD ../ or CD ..\ or CD .. regardless of how you pass in separators. But what about reading a path back. How would you know if its say, a 'windows' path, with ' '
and \
allowed.
The Obvious 'Duh!' Question
What happens when you depend on, for example, the installation directory %PROGRAM_FILES% (x86)\Notepad++
. Take the following example.
var fs = require('fs'); // file system module
var targetDir = 'C:\Program Files (x86)\Notepad++'; // target installer dir
// read all files in the directory
fs.readdir(targetDir, function(err, files) {
if(!err){
for(var i = 0; i < files.length; ++i){
var currFile = files[i];
console.log(currFile);
// ex output: 'C:\Program Files (x86)\Notepad++\notepad++.exe'
// attempt to print the parent directory of currFile
var fileDir = getDir(currFile);
console.log(fileDir);
// output is empty string, ''...what!?
}
}
});
function getDir(filePath){
if(filePath !== '' && filePath != null){
// this will fail on Windows, and work on Others
return filePath.substring(0, filePath.lastIndexOf('/') + 1);
}
}
What happened!?
targetDir
is being set to a substring between the indices 0
, and 0
(indexOf('/')
is -1
in C:\Program Files\Notepad\Notepad++.exe
), resulting in the empty string.
The Solution...
This includes code from the following post: How do I determine the current operating system with Node.js
myGlobals = { isWin: false, isOsX:false, isNix:false };
Server side detection of OS.
// this var could likely a global or available to all parts of your app
if(/^win/.test(process.platform)) { myGlobals.isWin=true; }
else if(process.platform === 'darwin'){ myGlobals.isOsX=true; }
else if(process.platform === 'linux') { myGlobals.isNix=true; }
Browser side detection of OS
var appVer = navigator.appVersion;
if (appVer.indexOf("Win")!=-1) myGlobals.isWin = true;
else if (appVer.indexOf("Mac")!=-1) myGlobals.isOsX = true;
else if (appVer.indexOf("X11")!=-1) myGlobals.isNix = true;
else if (appVer.indexOf("Linux")!=-1) myGlobals.isNix = true;
Helper Function to get the separator
function getPathSeparator(){
if(myGlobals.isWin){
return '\\';
}
else if(myGlobals.isOsx || myGlobals.isNix){
return '/';
}
// default to *nix system.
return '/';
}
// modifying our getDir method from above...
Helper function to get the parent directory (cross platform)
function getDir(filePath){
if(filePath !== '' && filePath != null){
// this will fail on Windows, and work on Others
return filePath.substring(0, filePath.lastIndexOf(getPathSeparator()) + 1);
}
}
getDir()
must be intelligent enough to know which its looking for.
You can get even really slick and check for both if the user is inputting a path via command line, etc.
// in the body of getDir() ...
var sepIndex = filePath.lastIndexOf('/');
if(sepIndex == -1){
sepIndex = filePath.lastIndexOf('\\');
}
// include the trailing separator
return filePath.substring(0, sepIndex+1);
You can also use 'path' module and path.sep as stated above, if you want to load a module to do this simple of a task. Personally, i think it sufficient to just check the information from the process that is already available to you.
var path = require('path');
var fileSep = path.sep; // returns '\\' on windows, '/' on *nix
And Thats All Folks!
VVS's answer is correct, with the exception of parsing a path given by a file input in internet explorer (tested with IE8 - I do not know about other versions). In this case, the path given by the input element's value (input.value) is in the form "C:\fakepath\<filename>". Note the backslashes here.
Just use "/", it works on all OS's as far as I know.