import VectorLayer from 'ol/layer/Vector'

import VectorSource from 'ol/source/Vector'

import Draw from 'ol/interaction/Draw';

const drawSource = new VectorSource();

const drawLayer = new VectorLayer({

????source: drawSource

});

map.addLayer(drawLayer);

var draw;

// 開始繪制多邊形

drawPolygon (type) {

? ? draw = new Draw({

? ? ? ? source: drawSource,

? ? ? ? type: type

? ? })

? ? map.addInteraction(draw);

? ? draw.on('drawend', ()? => {

? ? ? ? console.log('繪制完成');

? ? });

}

// 結束繪制

endDraw () {

? ? map.removeInteraction(draw);

}

// Point? LineString? Polygon? Circle

drawPolygon('Polygon');