How in the yandex map api when clicking on the balloon to get the value of the attribute of the element on which they clicked?

Here is a piece of code:

myMap.balloon.events.add('click', function (e) { //// }); 

According to it, I define a click inside the balun, I have a button inside it, when I click inside the balun, I need to determine in the script that there was a click on the button, generally use .hasClass or .attr

Or is it better to register onclick = "" in the tag of the button itself?