在 Javascript canvas 中加载 drawImage() 方法时出错

Question

我的代码中有以下 class：

//Collectables
const humanImg = new Image();
humanImg.src = "../images/human.png";
const mutationImg = new Image();
mutationImg.src = "../images/mutation.png";
//Canvas
const mycanvas = document.getElementById('my-canvas');
let ctx = mycanvas.getContext('2d');
//Classes
class Collectable {
    constructor(img, x, y, width, height) {
        this.img = img;
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.collected = false;
        this.notScored = true;
        this.mutate = false;
    };
    draw(){
        ctx.drawImage(this.img, this.x, this.y, this.width, this.height);
    };
    checkcollision(object) {
        return (
          this.x < object.x + object.width &&
          this.x + this.width > object.x &&
          this.y < object.y + object.height &&
          this.y + this.height > object.y
        );
    };
    collect(object){
        if (this.checkcollision(object)) {
            this.collected = true;
            ctx.clearRect(this.x, this.y, this.width, this.height);
            ctx.fillStyle = "black";
            ctx.fillRect(this.x, this.y, this.width, this.height);
            this.mutate = true;
        };
    };
    updateScore(object, score){
        if ((this.checkcollision(object)) && (this.notScored === true)){
            points += score;
            pointsRestart += score;
            this.notScored = false;
            playerMovingAudio.play();
            playerMovingAudio.volume = 0.6;
        };
    };
};

稍后我调用 class 收藏品时的代码：

// Collectables
const specialCollects = [
    new Collectable(mutationImg, 20, 60, 30, 30),
    new Collectable(mutationImg, 950, 60, 30, 30),
    new Collectable(mutationImg, 20, 500, 30, 30),
    new Collectable(mutationImg, 950, 500, 30, 30)
];

我得到一个错误：

Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The HTMLImageElement provided is in the 'broken' state.

而且我不知道如何解决，错误在这一行：

ctx.drawImage(this.img, this.x, this.y, this.width, this.height);

在 class 收藏品中。我试图在该行添加和加载事件，但错误仍然存在。我能做什么？

谢谢！

Answer 1

终于把js文件改到根目录下解决了这个问题。我认为查找图像需要时间，因为它必须在两个文件夹之间查找，我之前将 js 文件放在一个名为 \js 的文件夹中。非常感谢！

在 Javascript canvas 中加载 drawImage() 方法时出错

Error in loading drawImage() method in Javascript canvas

javascript

canvas

html5-canvas

onload

drawimage