After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Process control-switch..
default ：默认事件
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Courses in the relevant section：get and set
传参，调用set menu()方法；不传参调用 get menu() 方法
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Courses in the relevant section：WeChat Mini Program official account registration
已经学习，mark~
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