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命令模式(Command Pattern)：将一个请求封装为一个对象，从而让我们可用不同的请求对客户进行参数化；对请求排队或者记录请求日志，以及支持可撤销的操作。命令模式是一种对象行为型模式，其别名为动作(Action)模式或事务(Transaction)模式。 模式结构图 命令模式 ...

Merck & Co. Inc. $82.74 2.90 3.63% ...

Amnesty International condemned Thursday the Dominican Republic’s new health protocol that requires migrants to provide documentation and pay fees to access public health services. The group argued ...

This is the principle behind the elite Pattern class of racing, where horses compete on largely level terms to decide who is best. Yet horses with less exalted levels of ability should have a chance ...

Meet 33 innovative leaders who are using their voices and talents to tackle the planet’s most pressing issues. For decades, the Congo Basin was largely invisible to climate science. Now, a new ...

He looks pattern class and might be one his stable has for something at Royal Ascot at seven furlongs. Good Friday was a day top heavy with handicaps, among which the performance of Old Harrovian ...