javascript - 当我遇到重新启动的障碍时，我将如何添加一个事件

Question

我目前正在开发一个小游戏，我试图在遇到障碍物时实现“游戏结束”功能。但每次我添加所有代码来实现该功能时，它都会破坏一切。如果有人能帮助我，我将不胜感激。我不确定是什么问题。

完整代码如下(仅js部分):

var myGamePiece;
var myObstacle;

function startGame() {
    myGamePiece = new component(30, 30, "red", 225, 225);
    myObstacle = new component(40, 40, "green", 300, 120);
    myGameArea.start();
}

var myGameArea = {
    canvas : document.createElement("canvas"),
    start : function() {
        this.canvas.width = 1000;
        this.canvas.height = 890;
        this.context = this.canvas.getContext("2d");
        document.body.insertBefore(this.canvas, document.body.childNodes[0]);
        this.frameNo = 0;
        this.interval = setInterval(updateGameArea, 20);
        window.addEventListener('keydown', function (e) {
            e.preventDefault();
            myGameArea.keys = (myGameArea.keys || []);
            myGameArea.keys[e.keyCode] = (e.type == "keydown");
        })
        window.addEventListener('keyup', function (e) {
            myGameArea.keys[e.keyCode] = (e.type == "keydown");
        })
    },
    stop : function() {
        clearInterval(this.interval);
    },    
    clear : function() {
        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
    }
}

function component(width, height, color, x, y, type) {

    this.type = type;
    this.width = width;
    this.height = height;
    this.speed = 0;
    this.angle = 0;
    this.moveAngle = 0;
    this.x = x;
    this.y = y;    
    this.update = function() {
        ctx = myGameArea.context;
        ctx.save();
        ctx.translate(this.x, this.y);
        ctx.rotate(this.angle);
        ctx.fillStyle = color;
        ctx.fillRect(this.width / -2, this.height / -2, this.width, this.height);
        ctx.restore();    
    }
    this.newPos = function() {
        this.angle += this.moveAngle * Math.PI / 180;
        this.x += this.speed * Math.sin(this.angle);
        this.y -= this.speed * Math.cos(this.angle);
    }

}

function updateGameArea() {

    myGameArea.clear();
    myGamePiece.moveAngle = 0;
    myGamePiece.speed = 0;
    myObstacle.update();
    if (myGameArea.keys && myGameArea.keys[37]) {myGamePiece.moveAngle = -2; }
    if (myGameArea.keys && myGameArea.keys[39]) {myGamePiece.moveAngle = 2; }
    if (myGameArea.keys && myGameArea.keys[38]) {myGamePiece.speed= 2; }
    if (myGameArea.keys && myGameArea.keys[40]) {myGamePiece.speed= -2; }
    myGamePiece.newPos();
    myGamePiece.update();
}

startGame();

Answer 1

尝试解决这个问题:您在第 14 和 17 行缺少分号让我们看看...