are made of Paths which are just  (in this case, they're a list of LatLng objects). MVCArrays have three events: insert_at, remove_at, and set_at. We can use those events to detect changes in the points of the Polygon.

There are also : dragstart, drag, and dragend. It's best to listen for dragend if you want to know that a shape was just dragged.

All together, we can detect any changes to a polygon:

// Loop through all paths in the polygon and add listeners// to them. If we just used `getPath()` then we wouldn't // detect all changes to shapes like donuts. polygon.getPaths().forEach(function(path, index){ google.maps.event.addListener(path, 'insert_at', function(){ // New point }); google.maps.event.addListener(path, 'remove_at', function(){ // Point was removed }); google.maps.event.addListener(path, 'set_at', function(){ // Point was moved }); }); google.maps.event.addListener(polygon, 'dragend', function(){ // Polygon was dragged }); 原文:http://stackoverflow.com/questions/20789385/how-can-i-detect-when-an-editable-polygon-is-modified