JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" onmousedown="mouseDown(event);">aaa</a>

JavaScript

function mouseDown(e){
  e = e || window.event;
  switch (e.which) {
   case 1: alert('left'); break;
   case 2: alert('middle'); break;
   case 3: alert('right'); break; 
  }
}