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<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript Errors</h1>
​
<p>You cannot use the value of a non-existing variable:</p>
​
<p id="demo"></p>
​
<script>
var x;
try {
  x = y + 1;
}
catch(err) {
  document.getElementById("demo").innerHTML = err.name;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_error_reference by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:02:13 GMT -->
</html>
​
​
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