它们是对象原型的属性，但是与状态变量不同，它们具有清单17所示的默认值。

They are properties of the object prototype, but unlike the state variables, they have default values as shown in Listing 17.

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由于内部函数持有到外部函数的变量的引用，所以这个带属性a的范围对象将不会被垃圾收集。

Because the inner function holds a reference to the outer function's variables, the scope object with property a will not be garbage collected.

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groupDN是一个强制属性，用于指定要检索的LDAP对象的专有名称，并且可以包含上下文变量。

GroupDN is a mandatory attribute that specifies the distinguished name of the LDAP object to be retrieved and can contain context variables.

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