<script type=text/javascript src="http://api.map.baidu.com/api?v=2.0&ak=meLsrCGyHcNblS88cmkFCgE1"></script>
<div id="l-map" style="width: 758px; height: 450px;"></div>
<script type="text/javascript">
// 百度地图API功能
var map = new BMap.Map("l-map");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 12);

var start = "大理";
var end = "丽江";
//三种驾车策略：最少时间，最短距离，避开高速
var routePolicy = [BMAP_DRIVING_POLICY_LEAST_TIME,BMAP_DRIVING_POLICY_LEAST_DISTANCE,BMAP_DRIVING_POLICY_AVOID_HIGHWAYS];
search(start,end,routePolicy[0]); //最少时间
function search(start,end,route){ 
    var transit = new BMap.DrivingRoute(map, {
        renderOptions: {map: map,panel:"r-result",enableDragging:true}, 
        policy: route
    });
    transit.search(start,end);
}

map.enableScrollWheelZoom();    //启用滚轮放大缩小，默认禁用
map.enableContinuousZoom();    //启用地图惯性拖拽，默认禁用
</script>