supermap标注把底图给覆盖了，还有底图和标注放大缩小不同步，求大神解救啊

map = new SuperMap.Map("mapDiv", {
       controls : [ new SuperMap.Control.LayerSwitcher(), new SuperMap.Control.Navigation({
           dragPanOptions : {
               enableKinetic : true
           }
       }), new SuperMap.Control.OverviewMap(), new SuperMap.Control.ScaleLine(), new SuperMap.Control.MousePosition() ],
       allOverlays : true
   });

layer1 = new SuperMap.Layer.TiledDynamicRESTLayer("底图", map1Url, {
       transparent : true,
       cacheEnabled : true
   }, {
       maxResolution : "auto", bufferImgCount: 0
       });


   layer2 = new SuperMap.Layer.TiledDynamicRESTLayer("标注", map2Url, {
       transparent : true,
       cacheEnabled : true
   },{
       maxResolution : "auto", bufferImgCount: 0
       });
   layer1.events.on({"layerInitialized":addLayer2});

function addLayer2() {
map.addLayers([layer1,layer2]);
map.setCenter(new SuperMap.LonLat(-9739617.97271,14555886.38423),7);
}

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