引擎运行时上下文环境 Execution Context
这个运行时上下文信息可以由容器或者客户机来设定。
This run-time context information can be set either by the container or by the client.
引导程序——创建应用程序上下文，它为应用程序提供运行时上下文。
Bootstrapping - creates an application context that provides the runtime context for an application.
ScriptContext是一个定义和控制脚本引擎运行时上下文的接口。
ScriptContext is an interface that defines and controls a script engine's run-time context.
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