Full code of an example:
$(function(){
$('#world-map-gdp').vectorMap({
map: 'world_mill',
series: {
regions: [{
values: gdpData,
scale: ['#C8EEFF', '#0071A4'],
normalizeFunction: 'polynomial'
}]
},
onRegionTipShow: function(e, el, code){
el.html(el.html()+' (GDP - '+gdpData[code]+')');
}
});
});