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2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.　　杨桂花的丈夫孙有为在城里打工，听到杨挂花竞选村主任的消息，极为不支持，决定带上在城里打工的男人们回村阻止杨桂花当选。王红粉听到消息立刻报告给杨桂花，杨桂花号召村里的女人们各显神通，把自家的男人们都给驯服了。选举时，王胡和胡胜使出浑身解数都没能阻止杨桂花，杨桂花以高票当选村主任。Home Operator板栗急忙迎上去叫道：爹，你来了。房租是六千一个月，交了半年，剩下的四千算是押金。他写下——万物霜天竞自由。