leaflet 图层高亮

http://leafletjs.com/examples/choropleth/example.html

相当于定义了几个函数：highlightFeature(设置高亮)、resetHighlight（重置）、zoomToFeature、onEachFeature

function highlightFeature(e) {
        var layer = e.target;

        layer.setStyle({
            weight: 5,
            color: '#666',
            dashArray: '',
            fillOpacity: 0.7
        });

        if (!L.Browser.ie && !L.Browser.opera && !L.Browser.edge) {
            layer.bringToFront();
        }

        info.update(layer.feature.properties);
    }

    var geojson;

    function resetHighlight(e) {
        geojson.resetStyle(e.target);
        info.update();
    }

    function zoomToFeature(e) {
        map.fitBounds(e.target.getBounds());
    }

    function onEachFeature(feature, layer) {
        layer.on({
            mouseover: highlightFeature,
            mouseout: resetHighlight,
            click: zoomToFeature
        });
    }

最后再添加到图层上：

geojson = L.geoJson(statesData, {
        style: style,
        onEachFeature: onEachFeature
    }).addTo(map);