调用高德地图的搜索功能

调用高德地图搜索附近位置时，常常碰到这样的问题：amap.placesearch is not a constructor

原因是： new AMap.PlaceSearch 时外层没有引入红色的方法

AMap.service(AMap.PlaceSearch,function(){ });

function autoSearch(keywords) {
                    debugger
                    var auto;
                    var msearch;
                    var mapCenter = map.getCenter();
                    var lnglatXY = [mapCenter.getLng(), mapCenter.getLat()];
                    MGeocoder.getAddress(lnglatXY, function (status, result) {
                        if (status === complete && result.info === OK) {
                            if (result.regeocode.pois.length > 0) {
                                var cityCode = result.regeocode.addressComponent.citycode;
                                AMap.service(AMap.PlaceSearch,function(){
                                    msearch = new AMap.PlaceSearch({
                                        pageSize:10,
                                        pageIndex:1,
                                        city:cityCode //城市
                                        //panel: "_ListContainer"
                                    });
                                });
                                if(keywords.length>0){
                                    msearch.searchNearBy(keywords,lnglatXY, 100000, function(status, result1) {
                                        autocomplete_CallBack(result1,cityCode);
                                    });
                                }
                            }
                        }
                    });
                }