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4. Concluding remarksThese mob were all assembled by Jia Hongwei and introduced to the principal criminals Sony and Weng Siliang.IT opportunities are worldwide. It has penetrated into every corner of the economy. It has also produced many job opportunities that have never appeared before. The development momentum is getting faster and faster. At the same time, it also means that its salary level is very high. They are absolutely competitive.Earlier this year, a blackmail software called "WannaCry" began to attack the Internet, from Chinese universities to British hospitals. In April this year, IDT, a Newark, New Jersey-based telecommunications company, suffered a similar attack, which was discovered by Goran Ben-Oni, the company's global chief operating officer. As Ben Oni said in an interview with the New York Times, he immediately realized that this blackmail software attack is different from other attacks against companies. It not only steals the information in the databases it infiltrates, but also steals the information needed to access these databases. This kind of attack means that hackers can not only obtain this information quietly, but also continuously monitor who accesses this information.Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.杨长帆大笑道：哥哥教我规矩，我就当交个学费，还能真占哥哥便宜不成？不过咱们话说清楚，下次要来再单议，我这边进贝壳的本钱每天都在涨。