I made a script that outputs distance beetween points, using `navigator.geolocation.getCurrentPosition`

and haversine formula. Unlucky, the `distance`

function doesn't work - it returns itself. Are there any mistake I don't see?

```
<script>
var options = {
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
};
navigator.geolocation.getCurrentPosition(success,error,options);
function success(pos, distance){
var crd = pos.coords;
var lat1=crd.latitude;
var lon1=crd.longitude;
var lat2=50; //Sample target latitude
var lon2=20; //Sample target longitude
}
function error(err){
document.getElementById("demo").innerHTML = "Błąd.";
}
//haversine formula
function distance(success, lat1, lon1, lat2, lon2) {
var p = 0.017453292519943295; // Math.PI / 180
var a = 0.5 - Math.cos((lat2 - lat1) * p)/2 + Math.cos(lat1 * p) * Math.cos(lat2 * p) * (1 - Math.cos((lon2 - lon1) * p))/2;
return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
}
function final(distance){
document.getElementById("demo").innerHTML = "Odległość: " + distance;
}
final(distance);
</script>
```

Read more here: https://stackoverflow.com/questions/65719728/distance-beetween-coordinates

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