openlayers 鼠标移入要素改变手指符号

let map = new ol.Map()
map.on('pointermove',(e)=>{
  let pixel = map.getEventPixel(e.originalEvent)
  let feature = map.forEachFeatureAtPixel(pixel,(feature)=>{
    return feature
  // 线、面要素不做鼠标移入样式修改
  if(feature == undefined || feature.getGeometry().getType() !='Point'){