OpenLayers Draw繪製時操作結束繪製

this.draw.finishDrawing()

Stop drawing and add the sketch feature to the target layer. The module:ol/interaction/Draw~DrawEventType.DRAWEND event is dispatched before inserting the feature.

使用方法：
可以通過鍵盤快捷鍵操作，結束draw繪製，將當前繪製的圖形添加到目標圖層中。