<!DOCTYPE html> <html> <body> <button id="demo" onclick="myFunction()">Click me to change my HTML content (innerHTML).</button> <script> function myFunction() { document.getElementById("demo").innerHTML = "Paragraph changed!"; } </script> </body> </html>
function Bar() { document.getElementById("a").onclick = Foo(); }
<button id="buttonName">Old Text</button> <script>document.getElementById('buttonName').innerText = 'New Text';</script>