Try it Editor: The JavaScript this Keyword

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<!DOCTYPE html>
<html>
<body>

<h2>The JavaScript <b>this</b> Keyword</h2>

<p>In this example, <b>this</b> represents the <b>person</b> object.</p>
<p>Because the person object "owns" the fullName method.</p>

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

<script>
// Create an object:
var person = {
    firstName: "John",
    lastName : "Doe",
    id       : 5566,
    fullName : function() {
       return this.firstName + " " + this.lastName;
    }
};

// Display data from the object:
document.getElementById("demo").innerHTML = person.fullName();
</script>

</body>
</html>

Result :