因为散步中的猫咪老师遇到了迷路的双胞胎兄妹，所以电视剧正在展开。
任务迫在眉睫，危急时刻，打入保密局内部的“鲨鱼”不得不冒死现身，目共两党展开了前所未有的情报斗争、隐蔽斗争……
Printing the screenshot above, we can see that the subscriber receives every message from the publisher. However, for Xiao Hong, she only wants to receive messages with red color and does not want to receive messages with black color. Therefore, we need to make the following modifications to the code. We can first add a key so that the subscriber can only subscribe to messages of interest to herself. The code is as follows:
< div id= "showcount" >
