// Create the script tag, set the appropriate attributes
var script = document.createElement('script');
script.src = 'https://maps.googleapis.com/maps/api/js?key=AIzaSyBWesZdBxC0wGJIXI6z_9tVRfSti6jcVQE&callback=initMap';
script.defer = true;
script.async = true;
// Attach your callback function to the `window` object
window.initMap = function() {
// JS API is loaded and available
};
// Append the 'script' element to 'head'
document.head.appendChild(script);
