以上で完了です。

開発を始めるには、デベロッパー ドキュメント をご覧下さい。

Google Maps JavaScript API をアクティベートする

まず初めに Google Developers Console で次の作業を行います。

  1. プロジェクトを作成または選択する
  2. Google Maps JavaScript API と関連サービスをアクティベートする
  3. 適切なキーを作成する
続ける

Marker animations with setTimeout()

Read the documentation or view this example full screen.

// If you're adding a number of markers, you may want to drop them on the map
// consecutively rather than all at once. This example shows how to use
// window.setTimeout() to space your markers' animation.

var neighborhoods = [
  {lat: 52.511, lng: 13.447},
  {lat: 52.549, lng: 13.422},
  {lat: 52.497, lng: 13.396},
  {lat: 52.517, lng: 13.394}
];

var markers = [];
var map;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    center: {lat: 52.520, lng: 13.410}
  });
}

function drop() {
  clearMarkers();
  for (var i = 0; i < neighborhoods.length; i++) {
    addMarkerWithTimeout(neighborhoods[i], i * 200);
  }
}

function addMarkerWithTimeout(position, timeout) {
  window.setTimeout(function() {
    markers.push(new google.maps.Marker({
      position: position,
      map: map,
      animation: google.maps.Animation.DROP
    }));
  }, timeout);
}

function clearMarkers() {
  for (var i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }
  markers = [];
}
<div id="floating-panel">
  <button id="drop" onclick="drop()">Drop Markers</button>
</div>
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#floating-panel {
  margin-left: -52px;
}
 <!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

実際に試す

コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Marker animations with <code>setTimeout()</code></title>
    <style>
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }
      /* Optional: Makes the sample page fill the window. */
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #floating-panel {
        position: absolute;
        top: 10px;
        left: 25%;
        z-index: 5;
        background-color: #fff;
        padding: 5px;
        border: 1px solid #999;
        text-align: center;
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }
      #floating-panel {
        margin-left: -52px;
      }
    </style>
  </head>
  <body>
    <div id="floating-panel">
      <button id="drop" onclick="drop()">Drop Markers</button>
    </div>
    <div id="map"></div>
    <script>

      // If you're adding a number of markers, you may want to drop them on the map
      // consecutively rather than all at once. This example shows how to use
      // window.setTimeout() to space your markers' animation.

      var neighborhoods = [
        {lat: 52.511, lng: 13.447},
        {lat: 52.549, lng: 13.422},
        {lat: 52.497, lng: 13.396},
        {lat: 52.517, lng: 13.394}
      ];

      var markers = [];
      var map;

      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          zoom: 12,
          center: {lat: 52.520, lng: 13.410}
        });
      }

      function drop() {
        clearMarkers();
        for (var i = 0; i < neighborhoods.length; i++) {
          addMarkerWithTimeout(neighborhoods[i], i * 200);
        }
      }

      function addMarkerWithTimeout(position, timeout) {
        window.setTimeout(function() {
          markers.push(new google.maps.Marker({
            position: position,
            map: map,
            animation: google.maps.Animation.DROP
          }));
        }, timeout);
      }

      function clearMarkers() {
        for (var i = 0; i < markers.length; i++) {
          markers[i].setMap(null);
        }
        markers = [];
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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Google Maps JavaScript API
Google Maps JavaScript API
ご不明な点がありましたら、Google のサポートページをご覧ください。