confused about using projection of vector in ol3

Question

I am confused about using projection of vector.

Should source of data projection be same as vector projection for ol3. or ol3 vector transformes source data to target projection.

Is following code correct as source in "EPSG:4326" target in "EPSG:3857" source: new ol.source.GeoJSON({ url: './resources/js/diriFay4326.geojson', projection: 'EPSG:3857' }) ,

I will appreciate if you answer

regards

Answer 1

正确，这是目前使openlayers 3转换GeoJSON功能的方法。