(() => {
function myMapInit(mapid) {
  var mymap = L.map(mapid).setView([38.891, 139.824], 16);
  L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
   attribution:
     '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
  }).addTo(mymap);
  var pl = [
      [38.892123,139.818884],
      [38.891187,139.819313],
      [38.891780,139.823411]
  ];
  var plProp = {color: "red", opacity: 0.4, weight: 9};
  var plobj = L.polyline(pl, plProp).addTo(mymap);
}
document.addEventListener("DOMContentLoaded", function(){
    myMapInit("mymap")}, false)
})();