Knowledge point 1 What is a delay function
The use of knowledge point 2 delay function
If the function has diversity, the deferred function will call the no-argument overload.
If you must pass in a function with parameters, you can put the function with parameters into a function without parameters, and then delay the execution of the function without parameters.
The function called by Invoke must be a function in the same class. If you want to call a function of another class, then wrap the function of calling another class in a no-argument function of this class to call.
Delayed repeated execution of functions (InvokeRepeating)
cancel delay function
As long as the specified delay is canceled, no matter how many delays are enabled by the previous function, it will be canceled uniformly.
Knowledge point 3 Delay function is affected by object inactivation and destruction
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