高德地图marker的遮挡问题

var marker = new AMap.Marker({
            position: [
              longitude,latitude,
            ],
            map: map,
            icon: startIcon,
          });

          marker.on("mouseover", function (e) {
            e.target.setTop(true);
          });
          marker.on("mouseout", function (e) {
            e.target.setTop(false);
          });

​