如何在同一张地图上显示两条路线？

Question

如何在同一张地图上显示两条路线？ 示例：A-> B y C-> D。 使用Google Maps API。

      function calcRoute1() {
        var start = 'Huanchaco-Trujillo';
        var end = 'Lince-Lima';
        var request1 = {
            origin:start,
            destination:end,
            travelMode: google.maps.TravelMode.DRIVING
        };
        directionsService.route(request1, function(response1, status) {
          if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response1);
          }
        });
      }

      function calcRoute2() {
        var start = 'Chiclayo-Lambayeque';
        var end = 'Tacna-Tacna';
        ...
      }

Answer 1

这对我有用：

    var directionsService1 = new google.maps.DirectionsService();
    var directionsDisplay1 = new google.maps.DirectionsRenderer();

    function calcRoute1() {
        var start = 'Huanchaco-Trujillo';
        var end = 'Lince-Lima';
        var request1 = {
            origin:start,
            destination:end,
            travelMode: google.maps.TravelMode.DRIVING
        };
        directionsService1.route(request1, function(response1, status) {
          if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay1.setDirections(response1);
        directionsDisplay1.setMap(map);
          }
        });
      }

      var directionsService2 = new google.maps.DirectionsService();
      var directionsDisplay2 = new google.maps.DirectionsRenderer();
      function calcRoute2() {
        var start = 'Chiclayo-Lambayeque';
        var end = 'Tacna-Tacna';
        var request2 = {
            origin:start,
            destination:end,
            travelMode: google.maps.TravelMode.DRIVING
        };
        directionsService2.route(request2, function(response2, status) {
          if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay2.setDirections(response2);
        directionsDisplay2.setMap(map);
          }
        });
      }
google.maps.event.addDomListener(window, 'load', load);

working example