Try it Editor: JavaScript Functions

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<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Functions</h2>

<p>In HTML the value of <b>this</b>, in a global function, is the window object.</p>

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

<script>
var x = myFunction();
function myFunction() {
    return this;
}
document.getElementById("demo").innerHTML = x; 
</script>

</body>
</html>

Result :