feat: 1. 添加武器击退功能，player 使用weapon_behavior/melee_behavior(hitbox 会调用 setup 初始化) 的 hitbox 击中 enemy_slow，enemy_slow拿到hitbox的knockback_power，以及hitbox指向enemy的方向，然后朝着该方向，使用power击退：调用enemy.gd 的 apply_knockback，然后_process中会对position修改，同时开启定时器，定时器结束的时候，使用 reset_knockback 重置

scenes/weapons/melee/melee_behavior.gd

@@ -0,0 +1,26 @@
+extends WeaponBehavior
+class_name MeleeBehavior
+
+@export var hitbox: HitboxComponent
+
+func execute_attack() -> void:
+	weapon.is_attacking = true
+	
+	var tween := create_tween()
+	
+	var recoil_pos := Vector2(weapon.atk_start_pos.x - weapon.data.stats.recoil, weapon.atk_start_pos.y)
+	tween.tween_property(weapon.sprite_2d, "position", recoil_pos, weapon.data.stats.recoil_duration)
+	
+	hitbox.enable()
+	hitbox.setup(get_damage(), critical, weapon.data.stats.knockback, weapon.get_parent())
+	
+	var attack_pos := Vector2(weapon.atk_start_pos.x + weapon.data.stats.max_range, weapon.atk_start_pos.y)
+	tween.tween_property(weapon.sprite_2d, "position", attack_pos, weapon.data.stats.attack_duration)
+	
+	tween.tween_property(weapon.sprite_2d, "position", weapon.atk_start_pos, weapon.data.stats.back_duration)
+	
+	tween.finished.connect(func():
+		hitbox.disable()
+		weapon.is_attacking = false
+		critical = false
+	)

scenes/weapons/melee/melee_behavior.gd.uid

@@ -0,0 +1 @@
+uid://bbqq80eq8fqwn

scenes/weapons/melee/weapon_behavior.gd

@@ -0,0 +1,27 @@
+extends Node2D
+class_name WeaponBehavior
+
+@export var weapon: Weapon
+
+var critical := false
+
+func execute_attack() -> void:
+	pass
+	
+func get_damage() -> float:
+	var damage := weapon.data.stats.damage + Global.player.stats.damage
+	var crit_chance := weapon.data.stats.crit_chance
+	if Global.get_chance_success(crit_chance):
+		crit_chance = true
+		damage = ceil(damage * weapon.data.stats.crit_damage)
+	
+	return damage
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass

scenes/weapons/melee/weapon_behavior.gd.uid

@@ -0,0 +1 @@
+uid://ww04x180xsa3

scenes/weapons/melee/weapon_punch.tscn

@@ -2,6 +2,7 @@
 
 [ext_resource type="PackedScene" uid="uid://dcc7rsdy4j8v6" path="res://scenes/weapons/weapon_base.tscn" id="1_soyvn"]
 [ext_resource type="PackedScene" uid="uid://c0fyx8gj5uexl" path="res://scenes/components/hitbox_component.tscn" id="2_gq287"]
+[ext_resource type="Script" uid="uid://bbqq80eq8fqwn" path="res://scenes/weapons/melee/melee_behavior.gd" id="3_sv013"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_gq287"]
 size = Vector2(52, 42)
@@ -22,3 +23,8 @@ monitorable = false
 z_index = 1
 shape = SubResource("RectangleShape2D_gq287")
 debug_color = Color(0.9556908, 0.042769283, 0.5218647, 0.41960785)
+
+[node name="WeaponBehavior" parent="." index="3" unique_id=1507497844 node_paths=PackedStringArray("hitbox", "weapon")]
+script = ExtResource("3_sv013")
+hitbox = NodePath("../Sprite2D/HitboxComponent")
+weapon = NodePath("..")