feature

var feature = new ol.Feature({
    geometry: new ol.geom.Polygon([brr]),

    data: _data[i],

    name: _name,
});
feature.setStyle(color)
source.addFeature(feature)

drawOverlay.setSource(source)
var feature = new ol.Feature({
    geometry: new ol.geom.Polygon(polygon.geometry.coordinates),

    data: polygon,

});
var chooseplan_style = new ol.style.Style({
    fill: new ol.style.Fill({
        color: _color
    }),
    //边线颜色
    stroke: new ol.style.Stroke({
        color: _color,

        width: 0
    }),

});
feature.setStyle(chooseplan_style)
source.addFeature(feature)