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<!DOCTYPE html>
<html>
<body>

<p>This example demonstrates how to pass parameter values when using the 
addEventListener() method.</p>

<p>Click the button to perform a calculation.</p>

<button id="myBtn">Try it</button>

<p id="demo"></p>

<script>
var p1 = 5;
var p2 = 7;

document.getElementById("myBtn").addEventListener("click", function() {
    myFunction(p1, p2);
});

function myFunction(a, b) {
    var result = a * b;
    document.getElementById("demo").innerHTML = result;
}
</script>

</body>
</html>