JScript 版本信息
JScript 是一种不断演变的语言,每个新版本都引入一些新的功能。 若要充分利用该语言的特定版本提供的所有功能,必须有兼容版本的编译器或脚本引擎。
版本和宿主应用程序
您可以使用的 JScript 版本取决于 JScript 代码将在客户端上的 Web 浏览器中运行还是在服务器上使用 .NET Framework 运行。 如果代码包含在 Visual Studio 应用程序中或位于命令行应用程序中,则将其视为服务器端代码。
JScript(Windows 脚本)
当编写运行在浏览器脚本引擎中的客户端脚本时,运行的脚本将检测引擎版本。 一旦知道了引擎版本,就可以运行使用兼容的 JScript 版本编写的脚本。 有关更多信息,请参见检测浏览器功能。
下表列出了宿主应用程序所实现的 Microsoft JScript 版本。
宿主应用程序 |
JScript 版本 |
---|---|
Internet Explorer 3.0 |
1.0 |
Internet Information Server 3.0 |
2.0 |
Internet Explorer 4.0 |
3.0 |
Internet Information Server 4.0 |
3.0 |
Visual Studio 6.0 |
4.0 |
Internet Explorer 5.0 |
5.0 |
Internet Explorer 5.01 |
5.1 |
Windows 2000 |
5.1 |
Internet Explorer 5.5 |
5.5 |
Internet Explorer 6.0 |
5.6 |
Windows XP(带有 SP2) |
5.6 |
Internet Explorer 7.0 |
5.7 |
Windows XP SP3 |
5.7 |
Windows Vista |
5.7 |
Internet Explorer 8.0 |
5.8 |
有关 JScript 客户端脚本的更多信息,请参见 JScript (Windows Script Technologies)(JScript - Windows 脚本技术)。
Visual Studio 中的 JScript
当为服务器端应用程序或命令行应用程序编写代码时,您可以使用的 JScript 版本取决于您面向的 .NET Framework 版本。 下表列出了 .NET Framework 的各个版本所实现的 Microsoft JScript 版本。
Visual Studio 版本 |
.NET Framework 版本 |
JScript 版本 |
---|---|---|
Visual Studio .NET 2002 |
.NET Framework 1.0 |
JScript 7.0 (JScript .NET 2002) |
Visual Studio .NET 2003 |
.NET Framework 1.1 |
JScript 7.0 (JScript .NET 2003) |
Visual Studio 2005 |
.NET Framework 2.0 |
JScript 8.0 |
Visual Studio 2008 |
.NET Framework 3.5 |
JScript 8.0 |
提示
ScriptEngineMajorVersion 函数和 @_jscript_version 条件编译变量所报告的版本号始终是数值。 这样就允许对版本号执行数值比较。 对于 .NET 版本的应用程序,所报告的版本为 7.x,而不是 .NET。 报告版本号为 7.x 或更高的引擎可以编译 JScript 8.0 代码。
语言元素
下表列出了 JScript 语言功能和首次引入这些功能的 JScript 版本。 .NET 7.0 和 8.0 列适用于 JScript .NET 2002、JScript .NET 2003 和 JScript 8.0,所有这些版本都附带有相同的语言功能。
JScript 5.8 引入了 JScript 版本 7.0 和 8.0 中未包括的下列语言元素:JSON 对象、JSON.parse 方法、JSON.stringify 方法、toJSON 方法、defineProperty 方法 和 getOwnPropertyDescriptor 方法。
语言元素 |
1.0 |
2.0 |
3.0 |
4.0 |
5.0 |
5.5 |
.NET 7.0 和 8.0 |
---|---|---|---|---|---|---|---|
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