internet explorer - Problems displaying google heat map -

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hope can me below code. i'm having issues getting heatmap load in chrome load in ie (after refresh) hope can provide me a/some pointers check im new google maps, js , json :-)

thank you!

           <!doctype html>     <html>       <head>         <title>phone home</title>         <meta name="viewport" content="initial-scale=1.0, user-scalable=no">         <meta charset="utf-8">         <style>           html, body, #map-canvas {             height: 100%;             margin: 0px;             padding: 0px           }         </style>         <script type="text/javascript" src="../src/markerclusterer.js"></script>         <script type="text/javascript" src="../src/jquery.js"></script>         <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?libraries=geometry,visualization&key=****"></script>     <script>         var map,heatmap;         var markers = [];         var xmlhttp = new xmlhttprequest();         var url = "../src/et.json";          function initialize() {             // create simple map.             map = new google.maps.map(document.getelementbyid('map-canvas'), {                 zoom: 3,                 center:  new google.maps.latlng(0,0)             });              getmarkers(url);              heatmap = new google.maps.visualization.heatmaplayer({                 data: markers             });              heatmap.setmap(map);         }          function getmarkers(url){             xmlhttp.onreadystatechange = function() {                 if (xmlhttp.readystate == 4 && xmlhttp.status == 200) {                     var myarr = json.parse(xmlhttp.responsetext);                     loadmarkers(myarr);                 }         }          xmlhttp.open("get", url, true);         xmlhttp.send();          function loadmarkers(arr) {             var out = "";             var i;             for(i = 0; < arr.length; i++) {                 var latlng = new google.maps.latlng(arr[i].latitude,arr[i].longitude);                 var marker = new google.maps.marker({                     position: latlng                 });                     markers.push(latlng);             }         }     }        google.maps.event.adddomlistener(window, 'load', initialize);  </script> </head> <body>            <div id="map-canvas"></div>  </body> </html>


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