Custom Overlay - Define constructor

custom-overlay-constructor.js

function BaseOverlay(options) {
    var point = options.point;

    this.el = options.el;
    this.point = new google.maps.LatLng(point.lat, point.lng);

    this.el.style.position = 'absolute';
}

BaseOverlay.prototype = Object.create(google.maps.OverlayView.prototype);
BaseOverlay.prototype.constructor = BaseOverlay;