1  driving = new BMap.DrivingRoute(map, {renderOptions:{map: map, autoViewport: true}});
 2            for (var i=0;i<points.length-1;i++){          
 3               driving.search(points[i],points[i+1]);       
 4             }
 5   
 6           driving.setSearchCompleteCallback(function(){
 7                   pts = driving.getResults().getPlan(0).getRoute(0).getPath();  
 8                   polyline = new BMap.Polyline(pts,{strokeColor:"blue",strokeWeight:3,strokeOpacity:0.8});       
 9                   map.addOverlay(polyline);              
10            });