百度地图中的起点和终点文本框输入取得怎么实现

[swagon]

map.addControl(new BMap.NavigationControl());
map.addControl(new BMap.ScaleControl());
var transit = new BMap.DrivingRoute(map, {
renderOptions: { map: map, panel: "results" },
onMarkersSet: function (pois) {
var start = pois[0].marker, end = pois[1].marker;
start.enableDragging(); //开启起点拖拽功能
end.enableDragging(); //开启终点拖拽功能
start.addEventListener("dragend", function (e) {
map.clearOverlays();
transit.search(e.point, end.getPosition());
});
end.addEventListener("dragend", function (e) {
map.clearOverlays();
transit.search(start.getPosition(), e.point);
});
}
});
transit.search("八一广场", "八一桥");关键是这句！！！！