These handlers can be registered in global, service, or operation scope, and the final handler chain is calculated by combining the handlers from all the scopes.
这些处理程序可以注册为全局、服务或操作作用域,并且最终的处理程序链将通过结合所有作用域的处理程序得出。
The objects in the function object's [[scope]] property are copied into the scope chain in the same order.
首先将函数对象[[scope]]内部属性中的对象,按顺序复制到作用域链中。
Global variables are always the slowest to access because they are always last in the scope chain.
全局变量总是最慢的,因为它们总是位于作用域链的最后一环。
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