手机移动端获取当前位置的问题,为什么在浏览器可以获取到,为什么在手机上定位不到位置?

Question

var map = new BMap.Map('map-all');

var gc = new BMap.Geocoder();
var geolocation = new BMap.Geolocation();
var addressDetail;
geolocation.getCurrentPosition(function(r) {
    if (this.getStatus() === BMAP_STATUS_SUCCESS) {
        var mk = new BMap.Marker(r.point);
        map.addOverlay(mk);
        map.panTo(r.point);
        var pointL = r.point;
        // alert(pointL);
        var newPoint = new BMap.Point(pointL.lng, pointL.lat);
        gc.getLocation(newPoint, function(rs) {
            var addComp = rs.addressComponents;
            addressDetail = addComp.province + addComp.city + addComp.district + addComp.street + addComp.streetNumber;
            var location = {
                longitude: pointL.lng || '', // 经度
                latitude: pointL.lat || '', // 纬度
                addressDetail: addressDetail || ''
            };
            success(location);
        });
    } else {
        var location = {
            longitude: '', // 经度
            latitude: '', // 纬度
            addressDetail: ''
        };
        success(location);
        alert(location);
    }
}, {enableHighAccuracy: true});