leaflet显示说明框

function getColor(d) {
			return d > 1000 ? '#800026' :
			       d > 500  ? '#BD0026' :
			       d > 200  ? '#E31A1C' :
			       d > 100  ? '#FC4E2A' :
			       d > 50   ? '#FD8D3C' :
			       d > 20   ? '#FEB24C' :
			       d > 10   ? '#FED976' :
			                  '#FFEDA0';
		}

var legend = L.control({position: 'bottomright'});

		legend.onAdd = function (map) {

			var div = L.DomUtil.create('div', 'info legend'),
				grades = [0, 10, 20, 50, 100, 200, 500, 1000],
				labels = [],
				from, to;

			for (var i = 0; i < grades.length; i++) {
				from = grades[i];
				to = grades[i + 1];

				labels.push(
					'<i style="background:' + getColor(from + 1) + '"></i> ' +
					from + (to ? '&ndash;' + to : '+'));
			}

			div.innerHTML = labels.join('<br>');
			return div;
		};

		legend.addTo(map);

转载自：https://blog.csdn.net/dyxcome/article/details/88959396