如何获取成功回调函数结果的赋值给变量

Question

I want to return "currentLoc". Unfortunately, it doesn't work for me. How is it possible to assign result of callback function to reuse it all through my code.

function currentLocation() {

    var options = {
        enableHighAccuracy: true,
        timeout: 5000,
        maximumAge: 0
    };

    function success(pos) {
        var crd = pos.coords;
        console.log(`Latitude : ${crd.latitude}`);
        console.log(`Longitude: ${crd.longitude}`);

        currentLoc = new google.maps.LatLng( crd.latitude, crd.longitude);

    };

    function error(err) {
        ///ERROR

    };

    if ( navigator.geolocation) 
        navigator.geolocation.getCurrentPosition(success, error, options);

   return currentLoc;

}

Answer 1

because the callback is happening asynchronously, your return statement happens before the success is ever even run.

an option would be to have your main currentLocation function take a callback, and call that with the value from inside success .