These instance variables are not reset and, if they are not null, are used to provide the username and password on every request.

这些实例变量不能重新设置，如果它们不为空，则用于为每个请求提供用户名和密码。

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Unlike instance variables, class variables are associated with all objects of a particular class and not with individual objects.

与实例变量不同的是，类变量与该类所有的对象关联在一起而非某个特定的对象。

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Accessing arrays, instance variables, and object references are not supported as of now.

目前不支持访问数组、实例变量和对象引用。

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