我刚刚尝试了kmlLayer.setMap(null)，它工作。不确定这是否适用于普通的标记，但似乎工作正确。

在新版本v3上，他们建议保持在数组中。如下。

参见overlay-overview中的示例。

var map;
var markersArray = [];

function initialize() {
  var haightAshbury = new google.maps.LatLng(37.7699298, -122.4469157);
  var mapOptions = {
    zoom: 12,
    center: haightAshbury,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };
  map =  new google.maps.Map(document.getElementById("map_canvas"), mapOptions);

  google.maps.event.addListener(map, 'click', function(event) {
    addMarker(event.latLng);
  });
}

function addMarker(location) {
  marker = new google.maps.Marker({
    position: location,
    map: map
  });
  markersArray.push(marker);
}

// Removes the overlays from the map, but keeps them in the array
function clearOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(null);
    }
  }
}

// Shows any overlays currently in the array
function showOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(map);
    }
  }
}

// Deletes all markers in the array by removing references to them
function deleteOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(null);
    }
    markersArray.length = 0;
  }
}

在这里你可以找到一个如何删除标记的例子:

https://developers.google.com/maps/documentation/javascript/examples/marker-remove?hl=es

// Add a marker to the map and push to the array.
function addMarker(location) {
  var marker = new google.maps.Marker({
    position: location,
    map: map
  });
  markers.push(marker);
}

// Sets the map on all markers in the array.
function setAllMap(map) {
  for (var i = 0; i < markers.length; i++) {
    markers[i].setMap(map);
   }
}

// Removes the markers from the map, but keeps them in the array.
function clearMarkers() {
  setAllMap(null);
}

// Deletes all markers in the array by removing references to them.
function deleteMarkers() {
  clearMarkers();
  markers = [];
}

我发现使用google-maps-utility-library-v3项目中的markermanager库是最简单的方法。

1. 设置标记管理器

mgr = new MarkerManager(map);
google.maps.event.addListener(mgr, 'loaded', function () {
    loadMarkers();
});

2. 向MarkerManager添加标记

function loadMarkers() {
  var marker = new google.maps.Marker({
            title: title,
            position: latlng,
            icon: icon
   });
   mgr.addMarker(marker);
   mgr.refresh();
 }

3.要清除标记，只需要调用MarkerManger的clearMarkers()函数

mgr.clearMarkers();

一个简单明了的rolinger答案的应用。

function placeMarkerAndPanTo(latLng, map) {
      while(markersArray.length) { markersArray.pop().setMap(null); }
      var marker = new google.maps.Marker({
        position: latLng,
        map: map
      });
      map.panTo(latLng);

      markersArray.push(marker) ;
    }

您需要将map null设置为该标记。

var markersList = [];    

function removeMarkers(markersList) {
   for(var i = 0; i < markersList.length; i++) {
      markersList[i].setMap(null);
   }
}

function addMarkers() {
   var marker = new google.maps.Marker({
        position : {
            lat : 12.374,
            lng : -11.55
        },
        map : map
       });
      markersList.push(marker);
   }