如何在Openlayers6中绘制lineString

var map = new ol.Map({
  target: 'map', // 指定地图显示的目标元素的ID
  view: new ol.View({
    center: ol.proj.fromLonLat([经度, 纬度]), // 设置地图中心点
    zoom: 缩放级别 // 设置地图缩放级别
  }),
  layers: [ // 添加地图图层
    new ol.layer.Tile({
      source: new ol.source.OSM() // 使用OpenStreetMap作为底图
    })
  ]
});

var lineLayer = new ol.layer.Vector({
  source: new ol.source.Vector(),
  style: new ol.style.Style({
    stroke: new ol.style.Stroke({
      color: 'blue',
      width: 2
    })
  })
});
map.addLayer(lineLayer);

var draw = new ol.interaction.Draw({
  source: lineLayer.getSource(),
  type: 'LineString'
});
map.addInteraction(draw);

draw.on('drawend', function(event) {
  var feature = event.feature;
  var coordinates = feature.getGeometry().getCoordinates();
  
  // 在控制台输出线段坐标
  console.log(coordinates);
});