*绘制点*/
        function interactionDrawPnt() {
            //清除绘制的内容
            removeEntities();
            //注册鼠标左键单击事件
            mouseEventManager.registerMouseEvent('LEFT_CLICK', function(movement) {
                //屏幕坐标转笛卡尔坐标
                var cartesian = webGlobe.viewer.getCartesian3Position(movement.position, cartesian);
                var cartographic = Cesium.Cartographic.fromCartesian(cartesian);
                var lng = Cesium.