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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Comparisons</h2>
​
<p>Input your age and click the button:</p>
​
<input id="age" value="18" />
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var age, voteable;
  age = Number(document.getElementById("age").value);
  if (isNaN(age)) {
    voteable = "Input is not a number";
  } else {
    voteable = (age < 18) ? "Too young" : "Old enough";
  }
  document.getElementById("demo").innerHTML = voteable;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_comparison_12 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:31 GMT -->
</html>
​
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