Better styling in example

examples/topojson.js

@@ -16,6 +16,12 @@ var raster = new ol.layer.Tile({
   })
 });
 
+
+var vector = new ol.layer.Vector({
+  source: new ol.source.TopoJSON({
+    url: 'data/topojson/world-110m.json'
+  }),
+  styleFunction: function(feature, resolution) {
     var styleArray = [new ol.style.Style({
       fill: new ol.style.Fill({
         color: 'rgba(255, 255, 255, 0.6)'
@@ -23,14 +29,9 @@ var styleArray = [new ol.style.Style({
       stroke: new ol.style.Stroke({
         color: '#319FD3',
         width: 1
-  })
-})];
-
-var vector = new ol.layer.Vector({
-  source: new ol.source.TopoJSON({
-    url: 'data/topojson/world-110m.json'
       }),
-  styleFunction: function(feature, resolution) {
+      zIndex: (feature.getGeometry().getType() !== 'MultiPolygon') ? 2 : 1
+    })];
     return styleArray;
   }
 });