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Tampering. When an attacker tampers with the contents of these registers, the attacker can cause the program to jump to the gadget address built by the attacker, thus implementing a JOP attack. A typical JOP gadget takes the form of:Malicious attackers insert malicious Script codes into Web pages. When users browse the pages, the Script codes embedded in the Web will be executed, thus achieving the purpose of malicious attacks on users.From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:一对热血虔诚的爱尔兰裔兄弟，因自卫杀人而得罪黑帮，警署以正当防卫之名无罪释放。从此之后，二人决定以己之力对抗社会渣滓，购买武器以暴制暴，在朋友洛克（大卫·德拉·洛克David Della Rocco 饰）的帮助下清除犯罪分子。联邦警探保罗·斯迈克（威廉·达福 Willem Dafoe 饰）负责侦破案件，本来毫无头绪；但 在黑帮头子“老爸乔”（卡洛·罗塔 Carlo Rota 饰）雇佣了传奇枪手“公爵”（比利·康诺利 Billy Connolly 饰）对抗麦克马纳斯兄弟之后，情况却发生了意想不到的变化……雪花飘落，寒风萧瑟，四重奏的悠扬旋律荡涤且治愈着他们每一个人的心……Multiple Factory Method Patterns该剧根据同名小说改编，设定为轴心国在第二次世界大战击败了同盟国，美国向德国和日本帝国投降，是一部架空历史的幻想类剧集。