Change marker to circleMarker?

[axi92]

I used the example https://github.com/calvinmetcalf/leaflet-ajax/blob/gh-pages/example/index.html#L50

But how can I change the marker to this:

var greencircle = {
    color: '#03dc03',
    weight: 5
}

var wien = L.circleMarker([48.208539, 16.372505], greencircle).bindPopup('<b>Wien, Wien</b>')
```,

[StefanBrand]

This might be interesting to you too: https://gis.stackexchange.com/a/307149/122597