Detect a device operating system using JavaScript. Windows OS will be more precisely recognized.

operatingsystem.js

if(navigator.appVersion.indexOf("Windows ")!=-1){
    os = getWindowsOS();
}else{
    os = navigator.platform;
}

function getWindowsOS(){
	// http://msdn.microsoft.com/en-us/library/ms537503(v=vs.85).aspx#PltToken
	if(navigator.appVersion.indexOf("Windows NT 10.")!=-1){
		return 'Windows 10';
	}else if(navigator.appVersion.indexOf("Windows NT 6.3")!=-1){
		return "Windows 8.1";
	}else if(navigator.appVersion.indexOf("Windows NT 6.2")!=-1){
		return "Windows 8";
	}else if(navigator.appVersion.indexOf("Windows NT 6.1")!=-1){
		return "Windows 7";
	}else if(navigator.appVersion.indexOf("Windows NT 6.0")!=-1){
		return "Windows Vista";
	}else if(navigator.appVersion.indexOf("Windows NT 5.2")!=-1){
		return "Windows Server 2003; Windows XP x64 Edition";
	}else if(navigator.appVersion.indexOf("Windows NT 5.1")!=-1){
		return "Windows XP";
	}else if(navigator.appVersion.indexOf("Windows NT 5.01")!=-1){
		return "Windows 2000, Service Pack 1 (SP1)";
	}else if(navigator.appVersion.indexOf("Windows NT 5.0")!=-1){
		return "Windows 2000";
	}else if(navigator.appVersion.indexOf("Windows NT 4.0")!=-1){
		return "Windows NT 4.0";
	}else if(navigator.appVersion.indexOf("Windows 98; Win 9x 4.90")!=-1){
		return "Windows Millennium Edition (Windows Me)";
	}else if(navigator.appVersion.indexOf("Windows 98")!=-1){
		return "Windows 98";
	}else if(navigator.appVersion.indexOf("Windows 95")!=-1){
		return "Windows 95";
	}else if(navigator.appVersion.indexOf("Windows CE")!=-1){
		return "Windows CE";
	}else{
		return "Windows OS, Version nicht bekannt";
	}
}