如何在Web应用程序中集成没有Internet的Google Map JavaScript API V3？

Question

我开发了一个Web应用程序，我在我的应用程序中集成了Goole Maps，用户可以使用谷歌地图搜索，放置标记，查看位置等，

这是我的代码

JS：

function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {

          center: {lat: 31.601043, lng: 74.169527},
          zoom: 12,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        });


        var input = document.getElementById('pac-input');
      var searchBox = new google.maps.places.SearchBox(input);
      map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

      // Bias the SearchBox results towards current map's viewport.
      map.addListener('bounds_changed', function() {
        searchBox.setBounds(map.getBounds());
      });


      // Listen for the event fired when the user selects a prediction and retrieve
      // more details for that place.
      searchBox.addListener('places_changed', function() {
        var places = searchBox.getPlaces();

        if (places.length == 0) {
          return;
        }

        // Clear out the old markers.
        markers.forEach(function(marker) {
          marker.setMap(null);
        });
        markers = [];

        // For each place, get the icon, name and location.
        var bounds = new google.maps.LatLngBounds();
        places.forEach(function(place) {
          var icon = {
            url: place.icon,
            size: new google.maps.Size(71, 71),
            origin: new google.maps.Point(0, 0),
            anchor: new google.maps.Point(17, 34),
            scaledSize: new google.maps.Size(25, 25)
          };

          // Create a marker for each place.
          markers.push(new google.maps.Marker({
            map: map,
            icon: icon,
            title: place.name,
            position: place.geometry.location
          }));

          if (place.geometry.viewport) {
            // Only geocodes have viewport.
            bounds.union(place.geometry.viewport);
          } else {
            bounds.extend(place.geometry.location);
          }
        });
        map.fitBounds(bounds);
      });

      loadMarkersDynamically(); // this function for loading markers in map

 map2 = new google.maps.Map(document.getElementById('map2'), {
            /* center: {lat: 31.615114, lng: 74.150065}, */
            center: {lat: 31.601043, lng: 74.169527},
            zoom: 12,
            mapTypeId: google.maps.MapTypeId.ROADMAP
          });
 var input2 = document.getElementById('pac-input2');
 var searchBox2 = new google.maps.places.SearchBox(input2);
 map2.controls[google.maps.ControlPosition.TOP_LEFT].push(input2);

 // Bias the SearchBox results towards current map's viewport.
 map2.addListener('bounds_changed', function() {
   searchBox2.setBounds(map2.getBounds());
 });

 var markers2 = [];
 // Listen for the event fired when the user selects a prediction and retrieve
 // more details for that place.
 searchBox2.addListener('places_changed', function() {
   var places2 = searchBox2.getPlaces();

   if (places2.length == 0) {
     return;
   }

   // Clear out the old markers.
   markers2.forEach(function(marker2) {
     marker2.setMap(null);
   });
   markers2 = [];

   // For each place, get the icon, name and location.
   var bounds2 = new google.maps.LatLngBounds();
   places2.forEach(function(place) {
     var icon2 = {
       url: place.icon,
       size: new google.maps.Size(71, 71),
       origin: new google.maps.Point(0, 0),
       anchor: new google.maps.Point(17, 34),
       scaledSize: new google.maps.Size(25, 25)
     };


     // Create a marker for each place.
      markers2.push(new google.maps.Marker({
       map: map2,
       icon: icon2,
       title: place.name,
       position: place.geometry.location
     })); 

     if (place.geometry.viewport) {
       // Only geocodes have viewport.
       bounds2.union(place.geometry.viewport);
     } else {
       bounds2.extend(place.geometry.location);
     }
   });
   map2.fitBounds(bounds2);
 });
}

我用这种方式初始化我的地图

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDwEvCr3alGTKBFt23yk4WVq5jg34I7CJs&libraries=places&callback=initMap"
    async defer></script>

现在我有了键然后我调用了initMap函数，一切都运行得非常完美映射它的功能等，但是当没有互联网连接时，地图没有初始化并且错误来了，既没有显示地图也没有工作它的功能，我的问题是，

• 是否可以在没有互联网的情况下集成googlemap？
• 当我将应用程序安装到客户端时，如果他没有互联网那么？
• 如果有任何方法可以整合没有互联网的地图，请告诉我？

谢谢

此致