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Stephen was afraid of silence for the first time. The empty sanctuary could even hear his crazy heartbeat. He raised his hand and drew half a circle in the air. Then he sighed and put his hand down. "No, Stephen, you shouldn't do this... shouldn't..." He felt that he was like a lost dog now and was at a loss.Include a multifunctional output circuitFigure 2From 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:怎么好好的就死了？孙鬼慌忙道：这个……这个……老太爷一定不是被人害的，要不然，王爷还能放过这事？陈老太太越听越心惊胆颤，拉着孙子手着急地问道：苞谷，那这事要怎么办？大苞谷道：怎么办？当然是进京找他们了。Apple续订传记体剧集《亲爱的》第二季，本剧集以粉丝给名人写信的形式，来回顾每位嘉宾的人生际遇，第二季影视界嘉宾将会有简·方达、维奥拉·戴维斯、赛琳娜·戈麦斯、吴珊卓、比利·波特、艾娃·德约列等，共有十集。Depending on the profession you intend to enter, you can choose a single course, certificate certification, or diploma in a certain field, such as network or program. The best plan for learning is to weigh your strengths and weaknesses, and then purposefully find and choose schools. The second half of this series will introduce in detail how to choose IT schools.