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<!DOCTYPE html> <html> <body> <h1>JavaScript 异常</h1> <p>您无法将数字转换为大写：</p> <p id="demo"></p> <script> var num = 1; try { num.toUpperCase(); } catch(err) { document.getElementById("demo").innerHTML = err.name; } </script> </body> </html>
运行结果
