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In the above program, we saw the broadcasting mechanism. What exactly is Scratch's broadcasting mechanism? Any role can broadcast messages with names, and the contents of general messages are very readable. When others feel that they have received the message, they will trigger the execution of the corresponding script. Look at the following roles, which are reflected in received messages and broadcast messages.王様の耳はロバの耳 南野陽子 薬丸裕英I actually want to write a little bit of abuse "whisper bb"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:Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:影片故事为原创，是一部以一流商社工作的铃木静香为主人公的歌舞片，风格偏荒诞滑稽，静香在片中受到一位催眠师的催眠，当音乐响起的时候，就会止不住地唱歌跳舞。