与json数据相关的矢量源错误

Question

var vectorSource = new ol.source.Vector({ 
    projection: 'EPSG:4326' 
}); 

var vectorLayer = new ol.layer.Vector({ 
    source: vectorSource 
}); 

var map = new ol.Map({ 
    target: 'mapdiv', 
    renderer: 'canvas', 
    layers: [new ol.layer.Tile({source: new ol.source.OSM()}),vectorLayer], 
    view: new ol.View({ 
     center: ol.proj.transform([2.1833, 41.3833], 'EPSG:4326', 'EPSG:3857'), 
     zoom: 2 
    }) 
}); 

var sessionData = {"4798":{"location":[{"lat":27.714622020721,"lng":85.31263589859}]},"5873":{"location":[{"lat":59.944732189178,"lng":17.821261882782}]}}; 

createMarkers(sessionData);//this function has issues 

//this function has no issue 
function addFeatures() { 
    var i, lat, lon, geom, feature, features = []; 
    for(i=0; i< 10; i++) { 
     lat = Math.random() * 174 - 87; 
     lon = Math.random() * 360 - 180; 

     geom = new ol.geom.Point(ol.proj.transform([lon,lat], 'EPSG:4326', 'EPSG:3857')); 
     feature = new ol.Feature(geom); 
     features.push(feature);      
    } 
    vectorSource.addFeatures(features);     
} 

//this function show error 
function createMarkers(sessData) { 
    var geom, feature, features = []; 

    $.each(sessData,function(key,val) {   
     var locations = val.location; 
     if(location.length == 0) { 
      return true; 
     } 

     $.each(locations,function(index,value) { 
      if(value.lng == 0 || value.lat == 0) { 
       return; 
      } 
      geom = new ol.geom.Point(ol.proj.transform([value.lng,value.lat], 'EPSG:4326', 'EPSG:3857'));     
      feature = new ol.Feature(geom); 
      features.push(feature); 
     }); 
    }); 
    vectorSource.addFeature(features); 
} 

addFeatures和createMarkers函数具有非常相似的代码。 addFeatures函数没有问题，但是当调用createMarkers函数时，它会在行“vectorSource.addFeature（features）”处显示错误“Uncaught TypeError：a.addEventListener不是函数”

Answer 1

通过添加（s） addFeature结束。它的addFeatures而不是addFeature。