javascript4.3怎样用百度作为basemap？？

var layer = new WebTileLayer({

         urlTemplate: "http://online2.map.bdimg.com/tile/?qt=tile&x={row}&y={col}&z={level}&styles=pl"//watercolor

    });

    var myBasemap = new Basemap({

                baseLayers: [layer],//layer

                title: "Custom Basemap",

                id: "myBasemap"

            }

    );