我有一个按钮，用于启用/禁用地图的可拖动选项。
而且我需要将标记保持在地图中心，同时用户将拖动地图。
var map;
function toggleMapDraggable() {
if (map.get("draggable")) {
map.set("draggable", false);
} else {
map.set("draggable", true);
}
}
function initialize() {
var locations = [
['WELWYN GARDEN CITY ', 51.805616, -0.192647, 2],
['STANMORE ', 51.603199, -0.296803, 1]
];
map = new google.maps.Map(document.getElementById('map_canvas'), {
navigationControl: true,
scrollwheel: false,
scaleControl: false,
draggable: false,
zoom: 10,
center: new google.maps.LatLng(51.75339, -0.210114),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow();
var image = 'http://maps.google.com/mapfiles/ms/micons/blue.png';
var marker, i;
for (i = 0; i < locations.length; i++) …