google map api 中的路径规划生成的线路 起点 终点 有2个图标AB，怎么去掉或者替换？

function calculateAndDisplayRoute(directionsService, directionsDisplay) {

        directionsService.route({
            origin: new google.maps.LatLng(42.210897199999998, 110.6229108),
            destination: document.getElementById('end').value,
            travelMode: google.maps.TravelMode.DRIVING
        }, function (response, status) {
            if (status === google.maps.DirectionsStatus.OK) {
                directionsDisplay.setDirections(response);
            } else {
                window.alert('Directions request failed due to ' + status);
            }
        });
    }

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你也不弄个图，叫别人怎么看呀.