do coding(); while alive();

try ? {
????foo.bar();
} ? catch ?(e)? {
????alert(e.name? + ? " :? " ? + ?e.message);
}

• EvalError:?raised when an error occurs executing code in eval()
• RangeError:?raised when a numeric variable or parameter is outside of its valid range
• ReferenceError: raised when de-referencing an invalid reference
• SyntaxError: raised when a syntax error occurs while parsing code in eval()
• TypeError: raised when a variable or parameter is not a valid type
• URIError: raised when encodeURI() or decodeURI() are passed invalid parameters

上面的六種異常對(duì)象都繼承自Error對(duì)象。他們都支持以下兩種構(gòu)造方法:

new ?Error();
new ?Error( " 異常信息 " );

手工拋出異常的方法如下：

try ? {
???? throw ? new ?Error( " Whoops! " );
} ? catch ?(e)? {
????alert(e.name? + ? " :? " ? + ?e.message);
}

如要判斷異常信息的類型，可在catch中進(jìn)行判斷：

try ? {
????foo.bar();
} ? catch ?(e)? {
???? if ?(e? instanceof ?EvalError)? {
????????alert(e.name? + ? " :? " ? + ?e.message);
????} ? else ? if ?(e? instanceof ?RangeError)? {
????????alert(e.name? + ? " :? " ? + ?e.message);
????}
???? // ??etc
}

Error具有下面一些主要屬性：

• description: 錯(cuò)誤描述 (僅IE可用).
• fileName: 出錯(cuò)的文件名 (僅Mozilla可用).
• lineNumber: 出錯(cuò)的行數(shù) (僅Mozilla可用).
• message: 錯(cuò)誤信息 (在IE下同description)
• name: 錯(cuò)誤類型.
• number: 錯(cuò)誤代碼 (僅IE可用).
• stack: 像Java中的Stack Trace一樣的錯(cuò)誤堆棧信息 (僅Mozilla可用).

try ? {
????foo.bar();
} ? catch ?(e)? {
???? if ?(browserType? != ?BROWSER_IE)? {????????????????????????????
????????alert(
???????????? " name:? " ? + ?e.name? +
???????????? " \nmessage:? " ? + ?e.message? +
???????????? " \nlineNumber:? " ? + ?e.lineNumber? +
???????????? " \nfileName:? " ? + ?e.fileName? +
???????????? " \nstack:? " ? + ?e.stack);????????
????}
???? else ? {????????????????????
????????alert(
???????????? " name:? " ? + ?e.name? + ????
???????????? " \nerrorNumber:? " ? + ?(e.number? & ? 0xFFFF )? +
???????????? " \nmessage:? " ? + ?e.message " );????????
????}
}

try ? {
???? throw ? new ?Date();???? // ?拋出當(dāng)前時(shí)間對(duì)象
} ? catch ?(e)? {
????alert(e.toLocaleString());???? // ?使用本地格式顯示當(dāng)前時(shí)間
}