SharePoint 2013 Read Overlay setting using javascript

You can use the following the code to retrieve Calendar Overlay settings using Javascript:

EnsureScriptFunc('sp.js', 'SP.ClientContext', function(){

            var clientContext = new SP.ClientContext.get_current();

            if (clientContext != undefined && clientContext != null) {

                 var web = clientContext.get_web();

                                                                                                                               

                 var listCollection = web.get_lists();

                 var list = listCollection.getByTitle("Calendar");

                 var viewCollection = list.get_views();

                 this.view = viewCollection.getByTitle("Calendar");

                 clientContext.load(this.view);

                 clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded),    Function.createDelegate(this, this.onQueryFailed));

}

});

 function onQuerySucceeded() {

        alert(this.view.get_htmlSchemaXml()); //this contains overlays settings

 }

                               

 function onQueryFailed(sender, args) {

       alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());

 }