Querying and setting values of object properties.
查询并设置对象属性的值。
In addition, it supports operations beyond just getting and setting values; changes to configuration fields can also be observed.
此外,除了获取和设置值以外,它还支持其他的操作;还可以侦听对配置字段的更改。
It has methods for setting and getting the meaningful values.
它具有设置和获取有意义的值的方法。
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