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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button, and display "green" if a boolean value is <em>true</em>, otherwise display "red".</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
Boolean.prototype.myColor = function() {
  if (this.valueOf() == true) {
    return "green";
  } else {
    return "red";
  }
};
​
function myFunction() {
  var a = true;
  document.getElementById("demo").innerHTML = a.myColor();
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_prototype_boolean by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:27 GMT -->
</html>
​
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