<!DOCTYPE html>
<html>
<body onhashchange="myFunction()">

<p>This example demonstrates how to assign an "onhashchange" event to a body element.</p>

<p>Click the button to change the anchor part of the current URL to #part5</p>

<button onclick="changePart()">Try it</button>

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

<script>
// Using the location.hash property to change the anchor part
function changePart() {
    location.hash = "part5";
    var x = location.hash;
    document.getElementById("demo").innerHTML = "The anchor part is now: " + x;
}

// Alert some text if there has been changes to the anchor part
function myFunction() {
    alert("The anchor part has changed!");
}
</script>

</body>
</html>