百度地图自助绘图取坐标点

var getPloygonCoordinates = function(){
    var allOverlays = map.getOverlays();
    var allMarkers = [];
 
    for(var i = 0; i < allOverlays.length; i++) {
        if(allOverlays[i] instanceof BMap.Marker) {
            allMarkers.push(allOverlays[i]);
        }
    }
 
    for(var j=0;j<allMarkers.length;j++){
        console.log(allMarkers[j].latLng);
    }
}