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Welcome to pay attention to public micro-signals: wmyskxz_javawebFrom 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:宋仁宗年间，开封府尹包拯，通称包青天，为官清廉，为民伸冤，强调「人在做天在看」、「举头三尺有神明」不畏强权，除恶务尽。我国自古以来，历朝历代，无论盛世还是乱世，朝廷中都免不了皇亲国戚特权横行，欺压忠良。在社会上，更是免不了贪官污吏，藏垢纳贿。或是土豪劣绅，官商勾结，鱼肉乡民，荼毒百姓……This cannot be inserted into the card, is the card slot a decoration?Lv Meng this is quite special, even if invincible can cause damage.丧子的家庭主妇被扫地出门后，就得变成人生黑暗的“过街老鼠”，万嘉玲（张柏芝饰）手动填满入过的坑，告诉女人们只要自立自强，就算吞过苦果也能拥有独一无二的人生信仰，但在前夫病危的时候，她又毅然承担起爱情的责任，将女人的包容和魄力集于一身。而宋乔植（吴建豪饰）在亲情与爱情的选择中迷失，面对人生的难题又何去何从，与万嘉玲的婚姻情感纠葛让人深省又感人至深。