OL3 WFS JSONP

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.5.0/ol.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.5.0/ol.js"></script>
<div id="map" class="map"></div>


http://jsfiddle.net/goldrydigital/08zzh9n9/

CSS

html, body {
    height: 400px;
    width: 100%;
    padding: 0;
    margin: 0;
    border: 0;
    }
.map {
	height: 100%;
	width: 100%;
    }

JavaScript

var earthquakeFill = new ol.style.Fill({
  color: 'rgba(255, 153, 0, 0.8)'
});
var earthquakeStroke = new ol.style.Stroke({
  color: 'rgba(255, 204, 0, 0.2)',
  width: 1
});
var textFill = new ol.style.Fill({
  color: '#fff'
});
var textStroke = new ol.style.Stroke({
  color: 'rgba(0, 0, 0, 0.6)',
  width: 3
});
var invisibleFill = new ol.style.Fill({
  color: 'rgba(255, 255, 255, 0.01)'
});

function createEarthquakeStyle(feature) {
  // 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
  // standards-violating <magnitude> tag in each Placemark.  We extract it
  // from the Placemark's name instead.
  var name = feature.get('name');
  var magnitude = parseFloat(name.substr(2));
  var radius = 5 + 20 * (magnitude - 5);

  return new ol.style.Style({
    geometry: feature.getGeometry(),
    image: new ol.style.RegularShape({
      radius1: radius,
      radius2: 3,
      points: 5,
      angle: Math.PI,
      fill: earthquakeFill,
      stroke: earthquakeStroke
    })
  });
}

var maxFeatureCount;
function calculateClusterInfo(resolution) {
  maxFeatureCount = 0;
  var features = vector.getSource().getFeatures();
  var feature, radius;
  for (var i = features.length - 1; i >= 0; --i) {
    feature = features[i];
    var originalFeatures = feature.get('features');
    var extent = ol.extent.createEmpty();
    for (var j = 0, jj = originalFeatures.length; j < jj; ++j) {
      ol.extent.extend(extent, originalFeatures[j].getGeometry().getExtent());
    }
    maxFeatureCount = Math.max(maxFeatureCount, jj);
    radius = 0.25 * (ol.extent.getWidth(extent) + ol.extent.getHeight(extent)) /
        resolution;
    feature.set('radius', radius);
  }
}

var currentResolution;
function styleFunction(feature, resolution) {
  if (resolution != currentResolution) {
    calculateClusterInfo(resolution);
    currentResolution = resolution;
  }
  var style;
  var size = feature.get('features').length;
  if (size > 1) {
    style = [new ol.style.Style({
     ...