var select1 = document.getElementById("selectRegion");
  while (select1.options.length) {
   select1.options[0] = null;
  }
if (select1) {
  for (var i = 0; i < nregion.length; i++) {
    var opt = nregion[i];
    var tex =tregion[i];  
    var el = document.createElement("option");
    el.textContent = tex;
    el.value = opt;
    select1.appendChild(el);
   }
  }
var select3 = document.getElementById("selectStation");
  while (select3.options.length) {
   select3.options[0] = null;
  }
if (select3) {
  for (var i = 0; i < nstation188.length; i++) {
    var opt = nstation188[i];
    var tex =tstation188[i];  
    var el = document.createElement("option");
    el.textContent = tex;
    el.value = opt;
    select3.appendChild(el);
   }
  }