单击多段线时,它总是在谷歌地图的信息窗口中显示最后的路线距离

var geocoder;
var map;
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var locations = [
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Maroubra Beach', -33.950198, 151.259302, 1],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
];
var infowindow;


function initialize() {
  directionsDisplay = new google.maps.DirectionsRenderer({
    suppressPolylines: true,
    infoWindow: infowindow,
    polylineOptions: {
      strokeColor: '#C83939',
      strokeOpacity: 0,
      strokeWeight: 1,
      icons: [{
        icon: {
          path: google.maps.SymbolPath.CIRCLE,
          fillColor: '#C83939',
          scale: 3,
          strokeOpacity: 1
        },
        offset: '0',
        repeat: '15px'
      }]
    }
  });


  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 10,
    center: new google.maps.LatLng(-33.92, 151.25),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });
  directionsDisplay.setMap(map);
  var infowindow = new google.maps.InfoWindow();

  var marker, i;
  var request = {
    travelMode: google.maps.TravelMode.DRIVING
  };
  for (i = 0; i < locations.length; i++) {
    marker = new google.maps.Marker({
      position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    });

    google.maps.event.addListener(marker, 'click', (function(marker, i) {
      return function() {
        infowindow.setContent(locations[i][0]);
        infowindow.open(map, marker);
      }
    })(marker, i));

    if (i == 0)
      request.origin = marker.getPosition();
    else if (i == locations.length - 1)
      request.destination = marker.getPosition();
    else {
      if (!request.waypoints)
        request.waypoints = [];
      request.waypoints.push({
        location: marker.getPosition(),
        stopover: true
      });
    }

  }
  directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      //console.log(response);
      directionsDisplay.setDirections(response);
      var route = response.routes[0];
      var summaryPanel = document.getElementById("directions_panel");
      /************ New Code **********/
      directionsDisplay.setMap(map);
      directionsDisplay.setPanel(summaryPanel);
      /******************************/
      summaryPanel.innerHTML = "";
      // For each route, display summary information.



      /************* New Code *************/
      var polylineOptions = {
        strokeColor: '#C83939',
        strokeOpacity: 1,
        strokeWeight: 4
      };
      var polylines = [];
      for (var i = 0; i < polylines.length; i++) {
        polylines[i].setMap(null);
      }
      /***********************************/





      for (var i = 0; i < route.legs.length; i++) {
        var routeSegment = i + 1;
        summaryPanel.innerHTML += "<b>Route Segment: " + routeSegment + "</b><br />";
        summaryPanel.innerHTML += route.legs[i].start_address + " to ";
        summaryPanel.innerHTML += route.legs[i].end_address + "<br />";
        summaryPanel.innerHTML += route.legs[i].distance.text + "<br /><br />";
        /*********** INFOWINDOW *****************/
        var legs = route.legs;
        var steps = legs[i].steps;
        var stepPath = [];
        /************ New Code **********/
        var stepPolyline = new google.maps.Polyline(polylineOptions);
        /*******************************/

        for (j = 0; j < steps.length; j++) {
          var nextSegment = steps[j].path;

          for (k = 0; k < nextSegment.length; k++) {
            stepPath.push(nextSegment[k]);
            /************ New Code **********/
            stepPolyline.getPath().push(nextSegment[k]);
            /*******************************/
          }
          /************ New Code **********/
          stepPolyline.setMap(map);
          polylines.push(stepPolyline);
          /*******************************/

        }
        var center = stepPath[Math.floor(stepPath.length / 2)];
        var stepIW = new google.maps.InfoWindow();
        var testtext = response.routes[0].legs[i].duration.text + "<br>" + response.routes[0].legs[i].distance.text;
        console.log(testtext);
        /************ New Code **********/
        google.maps.event.addListener(stepPolyline, 'click', function(evt) {
          console.log('sdsd');
          stepIW.setContent(testtext);
          stepIW.setPosition(evt.latLng);
          stepIW.open(map, stepPolyline);
        });
        /*******************************/
      }
      computeTotalDistance(response);
    } else {
      alert("directions response " + status);
    }
  });
}

function attachInstructionText(stepDisplay, marker, text, map) {
  google.maps.event.addListener(marker, 'click', function() {
    // Open an info window when the marker is clicked on, containing the text
    // of the step.
    stepDisplay.setContent(text);
    stepDisplay.open(map, marker);
  });
}

function computeTotalDistance(result) {
  var totalDist = 0;
  var totalTime = 0;
  var myroute = result.routes[0];
  for (i = 0; i < myroute.legs.length; i++) {
    totalDist += myroute.legs[i].distance.value;
    totalTime += myroute.legs[i].duration.value;
  }
  totalDist = totalDist / 1000.
  document.getElementById("total").innerHTML = "total distance is: " + totalDist + " km<br>total time is: " + (totalTime / 60).toFixed(2) + " minutes";
}
google.maps.event.addDomListener(window, "load", initialize);

<script src="https://maps.google.com/maps/api/js?libraries=places"></script>
<div id="map" style="float:left;width: 800px; height: 400px;"></div>
<div id="control_panel" style="display:none;float:right;width:0%;text-align:left;padding-top:20px">
  <div id="directions_panel" style="margin:20px;background-color:#FFEE77;"></div>
  <div id="total"></div>
</div>