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javascript
JS 抛异常
實例一（標準）
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>阿西吧</title> <script> var txt=""; function message(){try {adddlert("Welcome guest!");}catch(err) {txt="本頁有一個錯誤。\n\n";txt+="錯誤描述：" + err.message + "\n\n";txt+="點擊確定繼續。\n\n";alert(txt);} } </script> </head> <body><input type="button" value="查看消息" onclick="message()" /></body> </html>?
實例二（finally 語句）
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>阿西吧</title> </head> <body> <p>不管輸入是否正確，輸入框都會再輸入后清空。</p> <p>請輸入 5 ~ 10 之間的數字：</p><input id="demo" type="text"> <button type="button" onclick="myFunction()">點我</button><p id="p01"></p><script> function myFunction() {var message, x;message = document.getElementById("p01");message.innerHTML = "";x = document.getElementById("demo").value;try { if(x == "") throw "值是空的";if(isNaN(x)) throw "值不是一個數字";x = Number(x);if(x > 10) throw "太大";if(x < 5) throw "太小";}catch(err) {message.innerHTML = "錯誤: " + err + ".";}finally {document.getElementById("demo").value = "";} } </script></body> </html>?
實例三（自定義異常Throw 語句）
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>啊西巴</title> </head> <body><p>請輸出一個 5 到 10 之間的數字:</p><input id="demo" type="text"> <button type="button" onclick="myFunction()">測試輸入</button> <p id="message"></p><script> function myFunction() {var message, x;message = document.getElementById("message");message.innerHTML = "";x = document.getElementById("demo").value;try { if(x == "") throw "值為空";if(isNaN(x)) throw "不是數字";x = Number(x);if(x < 5) throw "太小";if(x > 10) throw "太大";}catch(err) {message.innerHTML = "錯誤: " + err;} } </script></body> </html>?
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