我是 JavaScript 新手，我想从 Google V2 迁移到 Google v3，为此我只是更改了在 V2 中使用的方法，所有这些方法都在工作，但是当我尝试addListener从 V2 更改为 V3 时，我遇到了类似的问题在 v2 中，相同的侦听器用于将标记放在地图上，但是当涉及到 V3 时，我无法在地图上放置标记。这里我发布了 v2 代码和 V3 代码。请帮我解决这个问题。V2是：
GEvent.addListener(map, "click", function(marker, point) {
console.debug('after Click map is '+map+' marker is '+marker+' point is '+point);
if (marker) {
if(PolygonMarkers.length == 1){ //Only one marker in the array
map.removeOverlay(PolygonMarkers[0]);
map.removeOverlay(PolygonMarkers[0]);
PolygonMarkers = [];
if(Polygon){map.removeOverlay(Polygon)};
} else{ /*More then one marker*/
var RemoveIndex = -1;
var Remove;
//Search for clicked Marker in PolygonMarkers Array
for(var m=0; m<PolygonMarkers.length; m++)
{
if(PolygonMarkers[m].getPoint().equals(marker.getPoint()))
{
RemoveIndex = m; Remove = PolygonMarkers[m];
break;
}
}
//Shift Array elements to left
for(var n=RemoveIndex; n<PolygonMarkers.length-1; n++)
{
PolygonMarkers[n] = PolygonMarkers[n+1];
}
PolygonMarkers.length = PolygonMarkers.length-1 //Decrease Array length by 1
map.removeOverlay(Remove); //Remove Marker
geofencedetails.drawPolygon(); //Redraw Polygon
}
allMarkers = PolygonMarkers;
} else {
// Adds a new Polygon boundary marker
var markerOptions = { icon: icon, draggable: true };
var marker = new GMarker(point, markerOptions);
PolygonMarkers.push(marker); //Add marker to PolygonMarkers array
map.addOverlay(marker); //Add marker on the map
GEvent.addListener(marker,'dragstart',function(){ //Add drag start event
marker.setImage(icon.image);
polygon_resizing = true;
});
GEvent.addListener(marker,'drag',function(){
geofencedetails.drawPolygon();
}); //Add drag event
GEvent.addListener(marker,'dragend',function(){ //Add drag end event
marker.setImage(icon.image);
polygon_resizing = false;
geofencedetails.drawPolygon();
});
geofencedetails.drawPolygon();
allMarkers = PolygonMarkers;
}
});`
V3 是
google.maps.event.addListener(map, "click", function(marker, point) {
if (marker) {
//console.debug('marker '+marker.toSource());
if(PolygonMarkers.length == 1){ //Only one marker in the array
map.removeOverlay(PolygonMarkers[0]);
map.removeOverlay(PolygonMarkers[0]);
PolygonMarkers = [];
if(Polygon){
map.removeOverlay(Polygon)
};
}else { /*More then one marker*/
//console.debug('PolygonMarkers.length is '+PolygonMarkers.length);
var RemoveIndex = -1;
var Remove;
//Search for clicked Marker in PolygonMarkers Array
for(var m=0; m<PolygonMarkers.length; m++){
//console.debug('PolygonMarkers['+m+'] '+PolygonMarkers[m]);
if(PolygonMarkers[m].getPosition().equals(marker.getPosition())){
//console.debug('Both are equal ');
RemoveIndex = m;
Remove = PolygonMarkers[m];
break;
}
}
//Shift Array elements to left
for(var n=RemoveIndex; n<PolygonMarkers.length-1; n++){
PolygonMarkers[n] = PolygonMarkers[n+1];
}
PolygonMarkers.length = PolygonMarkers.length-1 //Decrease Array length by 1
/*map.removeOverlay(Remove); //Remove Marker*/
for (var i = 0; i < allMarkers.length; i++ ) {
allMarkers[i].setMap(null);
}
geofencedetails.drawPolygon(); //Redraw Polygon
}
allMarkers = PolygonMarkers;
} else {
//console.debug('In else block');
// Adds a new Polygon boundary marker
var markerOptions = { icon: icon, draggable: true };
//console.debug('1');
var marker = new GMarker(point, markerOptions);
//console.debug('2');
PolygonMarkers.push(marker); //Add marker to PolygonMarkers array
//console.debug('3');
map.addOverlay(marker); //Add marker on the map
//console.debug('4');
GEvent.addListener(marker,'dragstart',function(){ //Add drag start event
//console.debug('5');
marker.setImage(icon.image);
//console.debug('6');
polygon_resizing = true;
});
GEvent.addListener(marker,'drag',function(){
geofencedetails.drawPolygon();
}); //Add drag event
GEvent.addListener(marker,'dragend',function(){ //Add drag end event
marker.setImage(icon.image);
polygon_resizing = false;
geofencedetails.drawPolygon();
});
geofencedetails.drawPolygon();
allMarkers = PolygonMarkers;
}
});