Openlayers 4: WFS格式始终翻转EPSG上的坐标:4326

import proj4 from 'proj4';

// 定义EPSG:4326和OpenLayers默认坐标系的投影信息
proj4.defs("EPSG:4326", "+proj=longlat +datum=WGS84 +no_defs");
proj4.defs("EPSG:3857", "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs");

// 创建坐标转换函数
const transformCoordinates = (coordinates) => {
  return proj4("EPSG:4326", "EPSG:3857", coordinates);
};

// 获取WFS数据
const wfsData = getWFSData();

// 转换坐标
const transformedData = wfsData.map(feature => {
  const coordinates = feature.geometry.coordinates;
  const transformedCoordinates = transformCoordinates(coordinates);
  feature.geometry.coordinates = transformedCoordinates;
  return feature;
});

// 在地图上显示转换后的数据
const vectorSource = new ol.source.Vector({
  features: new ol.format.GeoJSON().readFeatures(transformedData)
});
const vectorLayer = new ol.layer.Vector({
  source: vectorSource
});
map.addLayer(vectorLayer);