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<!DOCTYPE html> <html> <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://w3schools.tw/"; } } } </script> <body> <h2>JavaScript Error Handling</h2> <input type="button" value="View message" onclick="message()" /> </body> </html>
