移相器+打字稿在更新中丢失了范围

问题描述

我觉得我做错了什么，但是在寻找与Phaser + Typescript相关的范围问题时，我没有提出任何建议(尽管JS'this'/范围有很多声音-看起来翻译得不太好).

I feel like I'm doing something wrong, but searching for Phaser + Typescript related scope issues I'm coming up with nothing (tons on JS 'this' / scope though - it doesn't seem to translate well).

我正在尝试设置一个Phaser.Game实例，据我所知，该实例需要一些回调(在我的情况下，是预加载，创建然后更新).直到浏览器关闭，更新才会被调用.

I'm trying to set up a Phaser.Game instance, which from my understanding takes a few callbacks (in my case, preload, create then update). Update gets called until the browser is closed.

我的问题是在update中，我无法访问当前类中的变量.

My issue is that inside update, I have no access to the variables inside the current class.

代码:

import { Player } from "./Player";
import { InputManager } from "./input/InputManager";
import { Point } from "./geometry/Point";

export class Game {
    private player: Player;
    private inputManager: InputManager;
    private game: Phaser.Game;

    constructor() {
        this.player = new Player();
        this.inputManager = new InputManager(new Phaser.Keyboard(this.game));
        this.game = new Phaser.Game(1024,400, Phaser.AUTO, 'content', { preload: this.preload, create: this.create, update: this.update });
    }

    private preload(): void {
        console.log(this.inputManager); // undefined
        this.game.load.image('terminal', 'terminal.png');
    }

    private create(): void {
        console.log("create");
        console.log(this.inputManager); // undefined
        var logo = this.game.add.sprite(this.game.world.centerX, this.game.world.centerY, 'terminal');
        logo.anchor.setTo(0.5, 0.5);

    }

    private update(): void {
         // update gets called right away, so check for inputManager to be initialized before contuing
        if(!this.inputManager) { // Will always be false - "this" isn't what i'm expecting
            console.log("undefined iputManager");
            return;
        }

        console.log("initialized update");
        this.inputManager.update();
        if(this.inputManager.newDirection)
        {
            this.move(this.inputManager.newDirection);
            this.inputManager.Clear();
        }
    }

    private move(newDirection: Point): void {
        // TODO: Movement check for the player
        this.player.Location.X += newDirection.X;
        this.player.Location.Y += newDirection.Y;
    }
}

推荐答案

很确定它在此行上:

this.game = new Phaser.Game(1024,400, Phaser.AUTO, 'content', { preload: this.preload, create: this.create, update: this.update });

您尚未将上下文与this.update关联，因此当Phaser调用它时，它不知道this应该是什么.

You haven't associated a context with this.update, so when Phaser calls it, it won't know what this should be.

尝试执行update: () => this.update()，update: this.update.bind(this)甚至update: function() { _this.update() }(其中_this是捕获函数外部this正确值的变量)，具体取决于您的JS版本.

Try doing update: () => this.update(), or update: this.update.bind(this), or even update: function() { _this.update() } (where _this is a variable that captured the correct value of this outside of the function), depending on your version of JS.

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