與Python相反，函數不是GDScript中的第一類對象。這意味著它們不能存儲在變量中，不能作為參數傳遞給另一個函數，也不能從其他函數返回。這是出於性能原因。

若要在運行時按名稱引用一個函數(例如，將其存儲在一個變量中，或將其作為參數傳遞給另一個函數)，必須使用``call``或``funcref`` 幫助器:

# 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.

8.引用函數