保持对代码的理解，不要完全依赖AI Coding——由一段Babylon.js开发出现的bug引发的感慨

子曰：AI Coding并不知道自己在干什么。

子曰：如果一段代码的bug找不到，不要整晚死磕，好好睡一觉，很可能第二天早上就找到了。

子还曰：保持清醒比无脑努力重要136.25倍。

子路：重要程度需要精确到小数点后两位吗？

子曰：需要！

使用cursor开发一个基于Babylonjs引擎的内容，cursor通过opus4.8帮我写了如下代码，注意的两段代码中关于attach的部分：

import { Observable, TransformNode, type Behavior } from "@babylonjs/core"; export default abstract class LerpBehavior implements Behavior<TransformNode> { public get name(): string { return "LerpBehavior"; } public static readonly behaviorName: string = "LerpBehavior"; private _uuid: string = ""; public get uuid(): string { return this._uuid; } protected _setUuid(uuid: string): void { this._uuid = uuid; } protected _target: TransformNode | null = null; public get target(): TransformNode | null { return this._target; } public readonly onSetProcessObservable = new Observable<number>(); public readonly onDetachObservable = new Observable<void>(); init() { } protected _isInitialized: boolean = false; protected _attached: boolean = false; attach(target: TransformNode) { if (this._attached) return; this._attached = true; this._target = target; } detach() { this.onDetachObservable.notifyObservers(); this.onDetachObservable.clear(); this._target = null; this._attached = false; this._isInitialized = false; } public dispose(): void { this._target?.dispose(); } public setProcess(process: number): void { if (!this._isInitialized && this._target) { this._initialize(); } this._applyProcess(process); } protected abstract _applyProcess(process: number): void; protected abstract _initialize(): void; }

import LerpBehavior from "./LerpBehavior"; import { Vector3, TransformNode, Axis, Space, Scalar } from "@babylonjs/core"; import { DTO_LerpPosition } from "../../../../../Shared/TScripts/DTO/DTO_RuntimeSystem"; export default class LerpPosition extends LerpBehavior{ public get name():string{return "LerpPosition";} public static readonly behaviorName = "LerpPosition"; public static createFromJson(trNode: TransformNode, jsonBehav: string): LerpPosition | undefined{ try { if(trNode){ const data: DTO_LerpPosition = JSON.parse(jsonBehav); if (!data) return undefined; const s = data.start; const e = data.end; const offsetStart = new Vector3(s.x, s.y, s.z); const offsetEnd = new Vector3(e.x, e.y, e.z); const behavior = new LerpPosition(offsetStart, offsetEnd); behavior._setUuid(data.uuid); trNode.addBehavior(behavior, true); behavior.setProcess(data.process || 0); return behavior; } return undefined; } catch (error) { console.error(`Failed to create LerpPosition:`, error); return undefined; } } private _offsetStart:Vector3; private _offsetEnd:Vector3; private _posStart: Vector3 | null = null; private _posEnd: Vector3 | null = null; constructor(offsetStart:Vector3, offsetEnd:Vector3){ super(); this._offsetStart = offsetStart; this._offsetEnd = offsetEnd; } public override attach(target: TransformNode): void { if (this._attached) return; this._attached = true; super.attach(target); } /** * 初始化起始和结束位置 * 使用局部空间的translate来计算相对于当前位置的偏移 */ protected override _initialize(): void { if (!this._target || this._isInitialized) return; const currentPosition = this._target.position.clone(); this._target.translate(Axis.X, this._offsetStart.x, Space.LOCAL); this._target.translate(Axis.Y, this._offsetStart.y, Space.LOCAL); this._target.translate(Axis.Z, this._offsetStart.z, Space.LOCAL); this._posStart = this._target.position.clone(); this._target.position = currentPosition; this._target.translate(Axis.X, this._offsetEnd.x, Space.LOCAL); this._target.translate(Axis.Y, this._offsetEnd.y, Space.LOCAL); this._target.translate(Axis.Z, this._offsetEnd.z, Space.LOCAL); this._posEnd = this._target.position.clone(); this._target.position = currentPosition; this._isInitialized = true; } protected override _applyProcess(process: number): void { if (!this._target) { return; } if (this._posStart && this._posEnd) { const p = Scalar.Clamp(process, 0, 1); this._target.position = Vector3.Lerp(this._posStart, this._posEnd, p); this.onSetProcessObservable.notifyObservers(process); } } }

注意，这中写法会导致子类中的

this._target = target;

这行代码永远得不到执行，所以this._target 一直是null ！

让opus4.8在debug模型调试了一晚上都找不到问题，回家！睡觉！！

第二天早上一眼就看到了，只要把LerpPosition里面的

public override attach(target: TransformNode): void { if (this._attached) return; this._attached = true; super.attach(target); }

写成：

public override attach(target: TransformNode): void { if (this._attached) return; super.attach(target); this._attached = true; }

就好了。

当然这种 override 代码本来就没个P用，我不明白cursor写他干嘛？因为这几行狗P根本就是直接删除了也行！！！

子最后曰：有了AI Coding也不要当甩手掌柜的。