Javascript DOM How to - Append a Method to DOM Elements

Question

We would like to know how to append a Method to DOM Elements.

Answer


<!DOCTYPE html>
<html>
<head>
</head><!--from   w w  w.j av  a2 s.  c  o  m-->
<body>
  <span id="test">test</span>
  <script type='text/javascript'>
var test = document.getElementById('test');
test.foo = function() {
    this.style.color = 'red'
}
test.foo()

</script>
</body>
</html>

The code above is rendered as follows: