Synchronous programming behavior with JSOM in SharePoint Online ?

It's pretty hard to understand what you are trying to achieve.

What it looks like you are doing is executing the call to SharePoint three times and then iterating over the result three times. That's a bit weird as the call wil retreive the same results.

clientContext.load(camlItems);
    for (var i = 0; i < 3; i++) {
        var a = '#';
        clientContext.executeQueryAsync(
            function () {

                success(camlItems);
            },
            error
        );
    }