navigator.geolocation.getCurrentPosition(successCallback, errorCallback);

        function successCallback(position) {
            let lat=position.coords.latitude;
            let lon=position.coords.longitude;

            $("#lon").text(lon);
            $("#lat").text(lat);
            var map = L.map('map').setView([lat, lon], 13);

            L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
            }).addTo(map);

            L.marker([lat, lon]).addTo(map)
                .bindPopup('你現在的位置在這邊')
                .openPopup();

        }
        function errorCallback(error) {
            console.log(error)
        }