Try it Yourself

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Variables</h1>

<p>Strings are written with quotes.</p>
<p>Numbers are written without quotes.</p>
<p>Try to experiment by removing the // comments.</p>

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

<script>
var pi = 3.14;
var person = "John Doe";
var answer = 'Yes I am!';

document.getElementById("demo").innerHTML = pi;
//document.getElementById("demo").innerHTML = person;
//document.getElementById("demo").innerHTML = answer;
</script>

</body>
</html>

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