问从geojson绘制openlayers多段线

EN

var strGeoJson = '{"type":"FeatureCollection","features":[{"type":"Feature","properties":{},"geometry":{"type":"LineString","coordinates":[[25.094146728515625,57.51877294160811],[25.135345458984375,57.55857562213471],[25.11749267578125,57.583614274541404],[25.022735595703125,57.58508660014084],[25.017242431640625,57.633639928856965],[25.11199951171875,57.655688188735766],[25.081787109374996,57.69240553526455],[24.97055053710937,57.68873547372526]]}}]}';

var route =  (
    new ol.format.Polyline({
        factor: 1e6
    }).readFeatures(
        strGeoJson,
        {
            dataProjection: 'EPSG:4326',
            featureProjection: 'EPSG:3857'
        }
    )
);


var routeFeature = new ol.Feature({
    type: 'route',
    geometry: route
});

vectorLayerSource = new ol.source.Vector({
    features: [routeFeature]
});

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