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<!DOCTYPE html>
<html>
<body>
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<h2>JavaScript addEventListener()</h2>
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<p>This example uses the addEventListener() method to add two click events to the same button.</p>
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<button id="myBtn">Try it</button>
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<script>
var x = document.getElementById("myBtn");
x.addEventListener("click", myFunction);
x.addEventListener("click", someOtherFunction);
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function myFunction() {
  alert ("Hello World!");
}
​
function someOtherFunction() {
  alert ("This function was also executed!");
}
</script>
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</body>
</html>
​