eature类型数组
            var features = format.read(result);

            //添加要素到绘制图层          
            drawSource.addFeatures(features);
            map.setView(new ol.View({
                center: [110, 30],
                zoom: 4,
                projection: 'EPSG:4326'
            }));
        }

        //清除客户端查询结果信息
        function clearA() {
            //停止进度条
            stopPressBar();
            if (drawSource) {
                //�