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江沪生和李芸接到养老院的护士茅娜报案，说养老院“闹”鬼，自己亲眼所见，二人前往检查闹“鬼”的房间，里面什么也没有。事隔一段时间，沪生忽然在半夜再次接到茅娜的电话尖叫，江沪生直奔那个闹鬼的房间，果然在钥匙里看到了上吊的白衣女人和凶手穿黑雨衣的身影，撞开门之后，却一身冷汗地发现房内依旧像上次检查一样，什么也没有，第二天，茅娜尸体躺在草地上，养老院护士纷纷辞职，老人也暴死。对养老院历史的彻底调查证明二十……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:怎么还剩这么多钱？我刚才看了四章收费章节，岂不是一章只要一毛钱？那也太便宜了……李越看了一下收费价格，发现小说的收费章节是千字三分。跟他们说了两句话，转头那白影就不见了。Is encapsulated with transactions.Episode 31