JavaScript - onClick to get the ID of the clicked button

Question

How do find the id of the button which is being clicked?

Answer 1

This is improvement of Prateek answer - event is pass by parameter so reply_click not need to use global variable (and as far no body presents this variant)

function reply_click(e) {
  console.log(e.target.id);
}

B1
B2
B3