OpenLayers 解析 GeoJSON 错误 \'Uncaught TypeError: feature.getId is not a function\'

Question

使用以下代码，我试图从地图上的多边形绘图中获取坐标，但我收到此控制台错误，而不是“Uncaught TypeError: feature.getId is not a function”

const drawInteraction = new Draw({
  type:'Polygon',
  freehand:true
})
map.addInteraction(drawInteraction);
drawInteraction.on('drawend',function(e){
  let parser= new GeoJSON();
  let drawnFeatures = parser.writeFeatureObject([e.feature]);
  console.log(drawnFeatures);
})      

Answer 1

实际上我发现了错误 让 drawnFeatures = parser.writeFeatures([e.feature]); 并不是 let drawnFeatures = parser.writeFeatureObject([e.feature]);