javascript change color of button onclick code example

Example 1: javascript change color of button

document.getElementById("button").style.background='#000000';

Example 2: onclick change text color javascript

<script>

    document.getElementById('change').onclick = changeColor;   

    function changeColor() {
        document.body.style.color = "purple";
        return false;
    }   

</script>

Example 3: javascript change button onclick

function Bar() {
  document.getElementById("a").onclick = Foo();
}