student integral0
After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Static binding and delayed binding technology of classes: detailed explanation of self, parent, static
static与self，parent是不一样的，它对应的类是动态设置的，由调用类决定
2021-05-200个赞
Courses in the relevant section：Object cloning technology: Create new objects like variable value transfer
克隆相当于值传递赋值，当前对象复制到新的变量中； 对象都是引用赋值；
