地理位置地图 api v3 setinterval

Question

是我的谷歌地图有错误，我需要每 5 秒更新一次用户的位置，以地图为中心，但是当使用 setCenter 时，由于地图不存在，它会留下不确定的错误，他们可以指导我。谢谢

function cargarMapa() {
      var MY_MAPTYPE_ID = 'custom_style';
       var featureOpts =[
      {"featureType": "administrative","elementType": "geometry","stylers": [{"visibility": "off"}]},
      {"featureType": "poi","stylers": [{"visibility": "off"}]},
      {"featureType": "road","elementType": "labels.icon","stylers": [{"visibility": "off"}]},
      {"featureType": "transit","stylers": [{"visibility": "off"}]}];

        var map = new google.maps.Map(document.getElementById('map'), {
          center: {lat: 6.268688560352701, lng: -75.59639199999998},
          zoom: 17,
          disableDefaultUI: true,
          zoomControl: true,
          zoomControlOptions: {
              position: google.maps.ControlPosition.RIGHT_CENTER
          }
        });
        var styledMapOptions = {name: 'mimap'};
        if (navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(function(position) {
              var pos = {
                lat: position.coords.latitude,
                lng: position.coords.longitude
              };

            var marker = new google.maps.Marker({
                position: pos,
                map: map,
                icon:"./ico/bicimini.png"
              });
              map.setCenter(pos);
          });
        } else {
          // Browser doesn't support Geolocation
          handleLocationError(false, infoWindow, map.getCenter());
        }

        var customMapType = new google.maps.StyledMapType(featureOpts, styledMapOptions);
         map.mapTypes.set(MY_MAPTYPE_ID, customMapType);

}
function actualizar() {

  navigator.geolocation.getCurrentPosition(function(position) {
      var pos = {
        lat: position.coords.latitude,
        lng: position.coords.longitude,
        altitude: position.coords.altitude,
        altitudeAccuracy: position.coords.altitudeAccuracy,
        heading: position.coords.heading,
        speed: position.coords.speed,
        timestamp: position.coords.timestamp
      };
      //alert(JSON.stringify(pos, null, 4));
      map.setCenter(pos);//indefinidad
  });
}

Answer 1

变量map 在cargarMapa 的范围内，在actualizar 中无法访问。在 cargarMapa 之外声明 map 就像这样......

let map

function cargarMapa() {
  ...
  map = new google.maps.Map(...)
}

function actualizar() {
  ...
  map.setCenter(pos);
}