JSFiddle - React, Tailwind, and code Playground

JavaScript

var greet = "Hello! ";
var name  = "JavaScript";
var timer = setTimeout( function() {
  my_alert(greet, name);
}, 3000);

function my_alert(a, b) {
  alert(a + b);
}

window.onmousemove = function(e){
  clearTimeout(timer);
};