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<!DOCTYPE html> <html> <body> <h2>JavaScript 错误</h2> <p>在此示例中，我们将警报编写为 adddlert 以故意产生错误：</p> <p id="demo"></p> <script> try { adddlert("Welcome guest!"); } catch(err) { document.getElementById("demo").innerHTML = err.message; } </script> </body> </html>