map = {
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container).setView([38.85682, 115.515404], 13);
let osmLayer = L.tileLayer('https://{s}.tile.thunderforest.com/spinal-map/{z}/{x}/{y}.png?apikey=d1921d56558744ed821907b2b1e1d642', {
attribution: 'Wikimedia maps beta | © <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
}