//清除图层并且注销事件

     function clearAll() {

         //判断之前是否有高亮面存在

         if (highlightFace) {

             highlightFace.material = highlightFace.material0;

         }

         var selectCancel = new Cesium.ScreenSpaceEventHandler(viewer.canvas);

         selectCancel.setInputAction(function (event) {

             selectCancel.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);

         }, Cesium.ScreenSpaceEventType.RIGHT_CLICK);

         //隐藏divPoint

         $(".label").hide();

     }