Roblox战斗系统报错：attempt to index nil with 'TakeDamage'求助

错误原因分析 #

• 获取敌人Humanoid的逻辑完全错误：你当前代码里Hitbox.Parent是玩家角色下的[玩家名]Melee文件夹，从这里找Humanoid必然返回nil，根本不是敌人的Humanoid。
• 判断条件写错：你用if Humanoid then做判断，这里的Humanoid是玩家自己的角色人形对象，永远不为空，导致不管有没有找到敌人Humanoid，都会执行enemyHumanoid:TakeDamage(Damage)，最终触发nil调用方法的错误。

修复方案 #

1. 修正敌人Humanoid的获取路径：从碰撞到的部件Hit向上查找，找到它所属的角色模型，再从模型里获取Humanoid。
2. 修正判断条件：判断是否成功获取到敌人的Humanoid，只有存在时才执行伤害逻辑。
3. 可选优化：增加对敌人Humanoid存活状态的判断，避免对已死亡角色重复处理。

修正后的完整代码 #

local rp = game:GetService("ReplicatedStorage")
local Combat = rp:WaitForChild("Combat")

local Debris = game:GetService("Debris")

local Animations = script:WaitForChild("Animations")
local Meshes = script:WaitForChild("Meshes")

local anims = 
    {
        Animations:WaitForChild("Right"),
        Animations:WaitForChild("Left"),
        Animations:WaitForChild("Gut"),
        Animations:WaitForChild("Kick"),
    }

local limbs = 
    {
        "RightHand",
        "LeftHand",
        "RightHand",
        "RightFoot"
    }

local Damage = 10
Combat.OnServerEvent:Connect(function(player,count)
    local Character = player.Character
    local Humanoid = Character:WaitForChild("Humanoid")
    
    local attack = Humanoid:LoadAnimation(anims[count])
    attack:Play()
    
    local Limb = Character:WaitForChild(limbs[count])
    
    local folder = Instance.new("Folder",Character)
    folder.Name = player.Name.."Melee"
    
    local Hitbox = Meshes:WaitForChild("Hitbox"):Clone()
    Hitbox.CFrame = Limb.CFrame
    Hitbox.Parent = folder
    Debris:AddItem(Hitbox,.5)
    
    local weld = Instance.new("ManualWeld")
    weld.Part0 = Hitbox
    weld.Part1 = Limb
    weld.C0 = weld.Part0.CFrame:ToObjectSpace(weld.Part1.CFrame)
    weld.Parent = weld.Part0
    
    Hitbox.Touched:Connect(function(Hit)
        if Hit:IsA("BasePart") then
            if not Hit:IsDescendantOf(Character) then
                -- 从碰撞部件向上查找角色模型，再获取Humanoid
                local enemyCharacter = Hit:FindFirstAncestorOfClass("Model")
                local enemyHumanoid = enemyCharacter and enemyCharacter:FindFirstChildOfClass("Humanoid")
                -- 判断是否获取到有效的敌人Humanoid，且处于存活状态
                if enemyHumanoid and enemyHumanoid.Health > 0 then
                    Hitbox:Destroy()
                    enemyHumanoid:TakeDamage(Damage)
                end
            end
        end
    end)
        
    Combat:FireClient(player)
end)

内容的提问来源于stack exchange，提问作者Bizarre_boyMan