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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