how does cleartimeout work code example

Example 1: js cleartimeout

var myVar;

function myFunction() {
  myVar = setTimeout(function(){ alert("Hello"); }, 3000);
}

function myStopFunction() {
  clearTimeout(myVar);
}

Example 2: clear timeout js

The clearTimeout() method of the WindowOrWorkerGlobalScope mixin cancels a timeout previously established by calling setTimeout().