16.类对象和构造函数

类对象

类对象是类的一个实例。类对象也可以称为类实例、实例化对象或类对象。

#Player.gd
extends Node2D
class_name Player
# class variables and functions

#Scene.gd
extends Node2D
var playerInstanceObject = Player.new()

类构造函数

类构造函数是一个特定的函数，每次创建类对象时都会调用它。
_init()您使用以下方法定义类构造函数：

#Player.gd
extends Node2D
class_name Player
var playerHealth: int
# Class Constructor
_init():
    playerHealth = 100

#Scene.gd
extends Node2D
var playerInstanceObject = Player.new() 
print(playerInstanceObject.playerHealth) # 100

您还可以将参数传递给构造函数：

#Player.gd
extends Node2D
class_name Player
var playerHealth: int
# Class Constructor
_init(startingHealth:int = 100):
    playerHealth = startingHealth

#Scene.gd
extends Node2D
var playerInstanceObject = Player.new(200) 
print(playerInstanceObject.playerHealth) # 200