我想在地图上增加点。但是我的代码有问题

html，正文{高度：100％；边距：0; 填充：0; } #map {高度：100％；} //创建一个map变量var map; var markers = []; //用于在地图div函数initMap（）{map = new google.maps.Map（document.getElementById（'map'），{center：{lat：40.74135，lng：-73.99802}，缩放：)中初始化地图的函数： 14}）;

    {title: 'Markerul', location: {lat: 40,7713024, lng: -73.9632393}}
  ];

  var largeInfowindow = new google.maps.InfoWindow();
  for(var i = 0; i<locations.length; i++){
    var positions = locations[i].location;
    var title = locations[i].title;
    var marker = new google.maps.Marker({
      map: map,
      position: position,
      title: title,
      animation: google.maps.Animation.DROP,
      id: i
    });
    markers.push(marker);
    // onclick
    marker.addListener('click', function (){
      populateInfoWindow(this, largeInfowindow);
    });
  }

  function populateInfoWindow(marker, infowindow){
    // verifica daca fereastra de info nu este deja deschisa
    if(infowindow.marker !=marker){
      infowindow.marker = marker;
      infowindow.setContent('<div>' + marker.title + '</div>');
      infowindow.open(map, marker);
      infowindow.addListener('closeclick', function(){
        infowindow.setMarker(null);
      });
    }
  }

  var largeInfowindow = new google.InfoWindow();
  var bounds = new google.maps.LatLngBounds();
  // crearea unei arii de markere
  for (var i = 0; i < locations.length; i++){
    // ia pozitia 
    var position = locations[i].location;
    var title = locations[i].title;
    //crearea unui marker per locatie si punerea lui in aria de markere
    var marker = new google.maps.Marker({
      map: map,
      position: position,
      title: title,
      animation: google.maps.Animation.DROP,
      id: i
    });
    //push the marker to our array of markers
    markers.push(marker);
    //extinderea ariei pt markere
    bounds.extend(marker.position);
    //onclick
    marker.addListener('click', function (){
      populateInfoWindow(this, largeInfowindow);
    });
  }
  map.fitBounds(bounds);
 }