使用说明：
leaflet-draw-measure 依赖于 leaflet-measure-path 这个测量插件，此插件添加了点击绘制园，多线段，矩形，多边形动态测量，根据传递的参数显示测量结果。
使用方法：
1.需要先安装 leaflet-measure-path 与 leaflet-draw-measure
npm i leaflet-measure-path
npm i leaflet-draw-measure2.引入插件
import L from "leaflet";
import 'leaflet-measure-path'
import 'leaflet-measure-path/leaflet-measure-path.css';
<body>
<div id="map"></div>
<div class="tools">
<li>园</li>
<li>线</li>、
<li>矩形</li>
<li>面</li>
<li>清除</li>
</div>
</body>
measure 是否显示面积，默认为true
<script type="module">
import MeasureDraw from '../src/index.js'
var map = L.map('map').setView([37.75, -122.23], 10);
L.esri.basemapLayer('Topographic').addTo(map);
const draw = new MeasureDraw({ map });
let dom = document.getElementsByClassName('tools')[0].getElementsByTagName('li');
dom[0].onclick = function () {
draw.createCricle();
}
dom[1].onclick = function () {
draw.createLine();
}
dom[2].onclick = function () {
draw.createRectangle();
}
dom[3].onclick = function () {
draw.createPolygon();
}
dom[4].onclick = function () {
draw.remove();
}
</script>
</html>
具体请查看example文件夹下面的index.html