如何使用geolocation来修改下面代码?

我想把下面的代码加入HTML5的geolocation功能来实现地图自动聚焦到使用者的位置，并且在路线确定上以A点作为使用者的初始位置。请问该如何修改下面的代码来实现这样的功能

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Travel modes in directions</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
#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;
}

    </style>
  </head>
  <body>
    <div id="floating-panel">
    <b>Mode of Travel: </b>
    <select id="mode">
      <option value="DRIVING">Driving</option>
      <option value="WALKING">Walking</option>
      <option value="BICYCLING">Bicycling</option>
      <option value="TRANSIT">Transit</option>
    </select>
    </div>
    <div id="map"></div>
    <script>
function initMap() {
  var directionsDisplay = new google.maps.DirectionsRenderer;
  var directionsService = new google.maps.DirectionsService;
  var coordination = new getLocation();
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 14,
    center: {coordination}
  });
  directionsDisplay.setMap(map);

  calculateAndDisplayRoute(directionsService, directionsDisplay);
  document.getElementById('mode').addEventListener('change', function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  });
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  var selectedMode = document.getElementById('mode').value;
  directionsService.route({
    origin: {coordination},  // Haight.
    destination: {lat: 43.6430, lng: -79.402},  // Ocean Beach.
    travelMode: google.maps.TravelMode[selectedMode]
  }, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });

  function getLocation() {
 if (navigator.geolocation) {
        navigator.geolocation.watchPosition(showPosition);
    } else {
        x.innerHTML = "Geolocation is not supported by this browser.";
    }
}
function showPosition(position){
    var lat = position.coords.latitude;
var lon = position.coords.longitude;
}
}

    </script>
   
        async defer></script>
  </body>
</html>

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