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<!DOCTYPE html>
<html>
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<script>
var txt = "";
function message() {
  try {
    adddlert("Welcome guest!");
  }
  catch(err) {
    txt = "There was an error on this page.\n\n";
    txt += "Click OK to continue viewing this page,\n";
    txt += "or Cancel to return to the home page.\n\n";
    if(!confirm(txt)) {
      document.location.href = "https://www.w3schools.com/";
    }
  }
}
</script>
​
<body>
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<h2>JavaScript Error Handling</h2>
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<input type="button" value="View message" onclick="message()" />
​
</body>
</html>
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