将一个请求封装成一个对象，从而让你使用不同的请求把客户端参数化，对请求排队或者记录日志，可以提供命令的撤销和恢复功能。
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
将一个请求封装成一个对象，从而让你使用不同的请求把客户端参数化，对请求排队或者记录日志，可以提供命令的撤销和恢复功能。
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
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