您可以听
dragend事件，如果将地图拖到允许的范围之外，请将其移回内部。您可以在
LatLngBounds对象中定义允许的范围，然后使用该
contains()方法检查新的经纬度中心是否在范围内。
您也可以非常轻松地限制缩放级别。
考虑以下示例：
[Fiddle Demo](http://jsfiddle.net/cse_tushar/9d4jy4ye/)
<!DOCTYPE html><html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <title>Google Maps Javascript API v3 Example: Limit Panning and Zoom</title> <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script></head> <body> <div id="map" ></div> <script type="text/javascript"> // This is the minimum zoom level that we'll allow var minZoomLevel = 5; var map = new google.maps.Map(document.getElementById('map'), { zoom: minZoomLevel, center: new google.maps.LatLng(38.50, -90.50), mapTypeId: google.maps.MapTypeId.ROADMAP }); // Bounds for North America var strictBounds = new google.maps.LatLngBounds( new google.maps.LatLng(28.70, -127.50), new google.maps.LatLng(48.85, -55.90) ); // Listen for the dragend event google.maps.event.addListener(map, 'dragend', function() { if (strictBounds.contains(map.getCenter())) return; // We're out of bounds - Move the map back within the bounds var c = map.getCenter(), x = c.lng(), y = c.lat(), maxX = strictBounds.getNorthEast().lng(), maxY = strictBounds.getNorthEast().lat(), minX = strictBounds.getSouthWest().lng(), minY = strictBounds.getSouthWest().lat(); if (x < minX) x = minX; if (x > maxX) x = maxX; if (y < minY) y = minY; if (y > maxY) y = maxY; map.setCenter(new google.maps.LatLng(y, x)); }); // Limit the zoom level google.maps.event.addListener(map, 'zoom_changed', function() { if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel); }); </script> </body> </html>上面示例的屏幕截图。在这种情况下，用户将无法向南或向东拖动：
