与Python相反，函数不是GDScript中的第一类对象。这意味着它们不能存储在变量中，不能作为参数传递给另一个函数，也不能从其他函数返回。这是出于性能原因。
若要在运行时按名称引用一个函数(例如，将其存储在一个变量中，或将其作为参数传递给另一个函数)，必须使用``call``或``funcref`` 帮助器:
# Call a function by name in one step.
my_node.call("my_function", args) # Store a function reference. var my_func = funcref(my_node, "my_function") # Call stored function reference. my_func.call_func(args)
Remember that default functions, like _init, and most notifications, such as _enter_tree, _exit_tree, _process, _physics_process, etc. are called in all base classes automatically. So there is only a need to call the function explicitly when overloading them in some way.