Interceptor callbacks are invoked when any object property is accessed by a script.

拦截器回调函数，当任意对象属性被脚本访问的时候被调用。

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Accessor callbacks are invoked when a specific object property is accessed by a script.

访问器回调函数，当指定的对象属性被脚本访问的时候被调用。

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The main loop then looks through its internal mapping table between its signals and handlers, also called callbacks, and calls the handlers registered for the given signal on the given object.

然后主循环查询自己的信号和处理程序之间的内部映射表，也叫做回调，并调用注册到指定对象的指定信号的处理程序。

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