JSFiddle - React, Tailwind, and code Playground

HTML

<div id="echo"></div>
<div id="echo2"></div>

JavaScript

document.addEventListener("mousemove", function (e) {
  var coord = [];
  coord[0] = e.clientX+'px';
  coord[1] = e.clientY+'px';

  next(coord); // вызов коллбэка
});

function next (coord) {
  console.log(coord);
  document.getElementById('echo').innerHTML=coord;
}

document.onclick = function() {
    document.getElementById('echo2').innerHTML='клик';
};