Get current coordinates in Javascript [duplicate]

This question already has an answer here:

• How do I return the response from an asynchronous call? 16 answers

need custom function, which return current coordintes, or if navigator not works return default coordinates.

Here is my code:

function GetCoorinates() {
var lon, lat;

if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function (location) {
        console.log(location.coords.latitude);
        console.log(location.coords.longitude);
        lat = location.coords.latitude;
        lon = location.coords.longitude;
        return [lon, lat]
    });

} else {
    return [40.13, 19.68];
}

};

Function always return undefined, but when I try print actual value of location.coords.latitude, it looks correct. Any ideas?