这个函数可以实现帐号过期并访问时间限制。
This function can implement account expiration and access hour restrictions.
例如，可能仅在某段时间内允许上载操作，或者可能将对某个目录的访问限制到特定用户或来自某些 IP 地址的用户。
For example, uploads might be allowed only during certain hours, or access to a directory might be restricted to specific users or users connecting from certain IP addresses.
软件开发项目有严格的时间和预算限制，设计人员和开发人员没有时间费劲地看完长长的易访问性标准的列表。
Software development projects typically have stringent time and budget constraints; designers and developers do not have time to wade through long lists of accessibility criteria.
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