[JavaScript]get OS version

get OS version

function getiOSVersion(){
	if (/iP(hone|od|ad)/.test(navigator.userAgent)) {
		var v = (navigator.appVersion).match(/OS (\d+)_(\d+)_?(\d+)?/);
		return parseInt(parseInt(v[1], 10).toString()+parseInt(v[2], 10).toString()+parseInt(v[3] || 0, 10).toString() ,10);
	}
	return 0.0;
}
function getAndroidVersion(){
	if( navigator.userAgent.indexOf("Android") > 0 ) {
		var v = navigator.userAgent.match(/Android [\d\.]+/)[0].split(' ').pop().split('.');
		return parseInt(parseInt(v[0], 10).toString()+parseInt(v[1], 10).toString()+parseInt(v[2] || 0, 10).toString() ,10);
	}
	return 0.0;
}