地图搜索时，清除上次的标注点，不是全部的点

    function setPlace(myValue) {     
     function myFun() {
      var j = 0;
        for (var i = 0; i < local.getResults().getCurrentNumPois(); i ++){       
        var pp = local.getResults().getPoi(i).point;
        var title = local.getResults().getPoi(i).title;
            map.centerAndZoom(pp, 18);
            var er =new BMap.Marker(pp);
            if(!map.centerAndZoom(pp, 18)){
             map.removeOverlay(er);
            }
             (function (x) { 
                    var opts = {title : '<span style="font-size:14px;color:#0A8021">地点</span>'};
                    var infoWindow =new BMap.InfoWindow("<div style='line-height:1.8em;font-size:12px;'>"+title+"</div>", opts);      
                    er.addEventListener("mouseover", function(){
                    
                        this.openInfoWindow(infoWindow);                    
                       });
                    er.addEventListener("mouseout", function(){
                    
                        this.closeInfoWindow(infoWindow);                    
                       });                  
                    map.addOverlay(er);
                    console.log(er)
                    //map.removeOverlay(er)
                    j++;
                   })(j)
         }                             
               // map.setCenter(pp)
               // local.enableAutoViewport()       
         }
        var local = new BMap.LocalSearch("南京", { //智能搜索
            onSearchComplete: myFun
        });
        local.search(myValue);
    }