Retrieve Data From 2 or More Lists in CSOM

 
<!-- Retrieve Data For Events-->
   
   
    <script type="text/javascript">

   window.onload = loadv;

        function loadv() {
            SP.SOD.executeFunc('sp.js', 'SP.ClientContext', retrieveAllListPropertiesEvent);
        }


    var collListItemEvent;
    var collListItemAnnouncement;
   
   
function retrieveAllListPropertiesEvent() {
    var clientContext = new SP.ClientContext.get_current();
    var clientContextAnn = new SP.ClientContext.get_current();
   
    var oWebsite = clientContext.get_web();
    var oWebsiteAnn = clientContextAnn.get_web();
   
    var collList = oWebsite.get_lists().getByTitle('OoredooEvents');
    var collListAnn = oWebsiteAnn.get_lists().getByTitle('OoredooAnnouncement');
     
    var camlQuery = new SP.CamlQuery();
    camlQuery.set_viewXml('<View><Query><OrderBy><FieldRef Name=\'ID\' Ascending=\'FALSE\'/></OrderBy></Query><RowLimit>4</RowLimit></View>');
     
    collListItemEvent = collList.getItems(camlQuery);
    collListItemAnnouncement = collListAnn.getItems(camlQuery);
   
    clientContext.load(collListItemAnnouncement)
    clientContextAnn.load(collListItemEvent);
   
    clientContextAnn.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceededAnn), Function.createDelegate(this, this.onQueryFailedAnn));
    clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceededEvent), Function.createDelegate(this, this.onQueryFailedEvent));
 
}


function onQuerySucceededAnn(){

var countAnn = 0;
  var listEnumeratorAnn = collListItemAnnouncement.getEnumerator();
 
  while(listEnumeratorAnn.moveNext()){
    var oListAnn = listEnumeratorAnn.get_current();
    countAnn++;
      $("#AnnouncementTitle" + countAnn).text(oListAnn.get_item("Title"));
      $("#AnnouncementDesc" + countAnn).text(oListAnn.get_item("Values"));
   
    }
   
   
    var count = 0;
var listEnumerator = collListItemEvent.getEnumerator();
var imgID = '';

    while (listEnumerator.moveNext()) {
        var oList = listEnumerator.get_current();
              count++;
          $("#EventTitle" + count).text(oList.get_item("Title"));
         
imgID = 'EventURL' + count;
   var imageSrc =oList.get_item("url");
var input = document.getElementById(imgID);
input.src = imageSrc;
       
    }


}

function onQueryFailedAnn(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

</script>
   
<!--End of Retrieve Data For Events-->