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<!DOCTYPE html> <html> <body> <p>Click the first button alert "Hello" after waiting 3 seconds.</p> <p>Click the second button to prevent the first function to execute. (You must click it before the 3 seconds are up.)</p> <button onclick="myFunction()">Try it</button> <button onclick="myStopFunction()">Stop the alert</button> <script> var myVar; function myFunction() { myVar = setTimeout(function(){ alert("Hello") }, 3000); } function myStopFunction() { clearTimeout(myVar); } </script> </body> </html>