The idea and implementation of getting the file suffix name in javascript_javascript skills

For a file name with an absolute path, such as: D:Program FilesNotepad Notepad .exe
First of all, in order to avoid problems with escaping backslashes, you can use regular expressions to replace or with #, such as:
D: #Program Files#Notepad #Notepad .exe
After that, use '#' as the delimiter to decompose the string into an array and get the following array:
D: ProgramFiles Notepad Notepad .exe
Get the last one of the array That is the file name with the suffix: Notepad .exe
and then use '.' as the delimiter to decompose the file name with the suffix into an array, and get the following array:
Notepad exe
and then take the array The last one can get the file suffix exe
The code is as follows (Win7 IE9 test passed):

Copy the code The code is as follows:

//by MoreWindows (http://www.jb51.net/qq)
function GetExtensionFileName(pathfilename)
{
var reg = /(\ )/g;
var pfn = pathfilename.replace(reg, "#");
var arrpfn = pfn.split("#");
var fn = arrpfn[arrpfn.length - 1] ;
var arrfn = fn.split(".");
return arrfn[arrfn.length - 1];
}
//by MoreWindows (http://www.jb51.net /qq)
function GetExtensionFileName(pathfilename)
{
var reg = /(\ )/g;
var pfn = pathfilename.replace(reg, "#");
var arrpfn = pfn.split("#");
var fn = arrpfn[arrpfn.length - 1];
var arrfn = fn.split(".");
return arrfn[arrfn.length - 1];
}

Test code:

Copy code The code is as follows:

function Test()
{
var filePath="D:\Program Files\Notepad \Notepad .exe";
alert(GetExtensionFileName(filePath));
}

function Test()
{
var filePath="D:\Program Files\ Notepad \Notepad .exe";
alert(GetExtensionFileName(filePath));
}

Click the Test button to pop up a dialog box with exe content, indicating that GetExtensionFileName can correctly parse the file name with an absolute path and obtain the suffix name.
I guess this method can only be used on the Windows platform. I wonder what will happen if it is executed on Linux?