        wrapX: false
            });
            drawLayer = new ol.layer.Vector({
                source: drawSource,
                style: new ol.style.Style({
                    //填充色
                    fill: new ol.style.Fill({
                        color: 'rgba(255, 0, 0, 0.5)'
                    }),
                    //边线样式
                    stroke: new ol.style.Stroke({
                        color: 'rgba(255,204, 51, 1)',
                        width: 1
                    