JAVASCRIPT OUTPUT USING INNERHTML
Run 
<html>
    <head>
        <title>Using innerHTML property</title>
        <script>
            function addText()
            {
                document.getElementById("msg").innerHTML = "Welcome to Studytonight";
            }
        </script>
    </head>
<body>
    <p id="msg">Hey there!</p>
    <button type="button" onclick="addText()">Click me!</button>
</body>
</html>