百度地图为什逆解析地址没反应

  var MapLng;
        var MapLat;
        map.removeOverlay(marker);
        geo.getPoint(obj.value, function (point) {
            if (point) {
                map.centerAndZoom(point, 15);
                marker = new BMap.Marker(point);
                map.addOverlay(marker);
                MapLng = point.lng;
                MapLat = point.lat;

            }
        }, '上海');
        var ply = new BMap.Polygon(pts);
        var pt = new BMap.Point(MapLng, MapLat);
        geo.getLocation(pt, function (rs) {
            var addComp = rs.addressComponents;
            alert(addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber);
        });

            没有反应，各位求帮忙

解码是异步的， geo.getPoint(obj.value, function (point) {这个回调还没执行就已经执行 geo.getLocation(pt, function (rs) {这句了，导致pt变量没有值。解码要放到geo.getPoint(obj.value, function (point) {回调里面

    var MapLng;
    var MapLat;
     map.removeOverlay(marker);
     geo.getPoint(obj.value, function (point) {
         if (point) {
             map.centerAndZoom(point, 15);
             marker = new BMap.Marker(point);
             map.addOverlay(marker);
             MapLng = point.lng;
             MapLat = point.lat;
             pointToAddress(); ////////
         }
     }, '上海');

    var ply = new BMap.Polygon(pts);
    function pointToAddress() {
        var pt = new BMap.Point(MapLng, MapLat);
        geo.getLocation(pt, function (rs) {
            var addComp = rs.addressComponents;
            alert(addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber);
        });
    }