Microsoft AJAX Library Cheat Sheet（5）： Number和Error类型的扩展

本文为翻译，英文原版的Cheat Sheet（PDF版本）在此下载：http://aspnetresources.com/downloads/ms_ajax_library_cheat_sheets1.zip

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注：标注有[S]的为静态方法，无须实例化对象即可使用。

 

Number.format (format)

用指定的format格式化数字（区域设定无关）。

 

Number.localeFormat (format)

用指定的format格式化数字（区域设定相关）。

 

支持的格式

1. p：将数字转为百分比字符串（e.g.: -1,234.56 %）
2. d：将数字装化为十进制字符串，没有逗号分隔符（e.g.: -1234.56）
3. c：将数字转化为货币金额形式（e.g.: (¤1,234.56)）
4. n：将数字串化为逗号三位分隔（-d,ddd,ddd.ddd…"）形式（e.g.: -1,234.56）

 

[S] Number.parseLocale (value)

从字符串表示的本地数字解析成相应的Number类型。使用Sys.CultureInfo.CurrentCulture得到当前的区域属性。

 

[S] Number.parseInvariant (value)

从字符串表示的本地数字解析成相应的浮点数Number类型。value中可以包含逗号分隔符（,）或是正负（+-）号。

var a = new Number();
a = Number.parseInvariant("4");
var b = new Number(2);
var c = Number.parseInvariant("1.53") + a + b;
// c = 7.53

 

Error相关的方法

1. [S] Error.argument：根据指定的异常信息和非法的参数创建一个Sys.ArgumentException类型的异常。
2. [S] Error.argumentNull：根据指定的异常信息和为Null的参数创建一个Sys.ArgumentNullException 类型的异常。
3. [S] Error.argumentType：根据指定的异常信息、期待参数类型和实际参数类型创建一个Sys.ArgumentTypeException 类型的异常。
4. [S] Error.argumentUndefined：根据指定的异常信息和为定义的参数创建一个Sys.ArgumentUndefinedException类型的异常。
5. [S] Error.create：根据指定的异常信息创建一个Error对象。
6. [S] Error.invalidOperation：根据指定的异常信息和引发该异常的参数创建一个Sys.InvalidOperationException 类型的异常。
7. [S] Error.notImplemented：根据指定的异常信息创建一个Sys.NotImplementedException类型的异常。
8. [S] Error.argumentOutOfRange：根据指定的异常信息和引发该异常的参数创建一个Sys.ArgumentOutOfRangeException类型的异常。
9. [S] Error.parameterCount：根据指定的异常信息创建一个Sys.ParameterCountException 类型的异常。
10. Error.popstackFrame：将该Error实例的fileName和lineNumber字段更新为该Error被掷出时的位置，而不是该Error被创建时的位置。

// Throw a standard exception type
var err = Error.argumentNull("input", "A parameter was undefined.");
throw err;
// Throw a generic error with a message and associated errorInfo object.
var errorInfoObj = { name: "SomeNamespace.SomeExceptionName",
someErrorID: "436" };
var err = Error.create("A test message", errorInfoObj);
throw err;