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我遇到了以下问题：我创建了一个创建子弹的对象构造函数，当我尝试使用它时，事件是“控制台日志”对象正在返回未定义的控制台日志。我出于什么错误的想法。函数对象返回undefined
对不起，代码混乱，英文不好。并提前致谢。 编辑：如果你打算投票，请告诉我的原因，所以我可以知道如何改善。
var canvas, ctx, Player,players, intervalo,x,y, keyUp,keyDown,keyLeft,keyRight,rX,rY,rRadius,rAngle,hei, orbitals, Orbital, mouseX, mouseY, tiros, Bullet, bullets;
keyUp = 87; keyDown = 83; keyRight = 68; keyLeft = 65;
hei = 0;
test = 0; tiros = 0;
function load(){
\t canvas = document.getElementById('box');
\t ctx = canvas.getContext('2d');
\t ctx.lineWidth = 3;
\t function player(){
\t \t this.x = canvas.width/2;
\t \t this.y = canvas.height/2;
\t \t this.speed = 2;
\t \t this.width = 10;
\t \t this.height = 10;
\t \t
\t \t this.up = false;
\t \t this.down = false;
\t \t this.left = false;
\t \t this.right = false;
\t }
\t function orbital(){
\t \t this.x = x;
\t \t this.y = y;
\t \t this.width = 3;
\t \t this.height = 3;
\t \t this.radius = 20;
\t \t this.angle = hei;
\t \t this.speed = 0;
\t }
\t Orbital = new Array();
\t for (var i = 0;i < 10; i++){
\t \t Orbital.push(new orbital())
\t \t orbitals = Orbital[i];
\t \t hei += 10;
\t \t orbitals.angle = hei;
\t }
\t Player = new Array();
\t Player.push(new player())
\t players = Player[0];
\t window.addEventListener("keydown", checkKeyDown, false);
\t function checkKeyDown(e) {
\t \t if (event.keyCode == keyUp){
\t \t \t players.up = true;
\t \t \t console.log("Up key is pressed");
\t \t } else if (event.keyCode == keyDown){
\t \t \t players.down = true;
\t \t \t console.log("Down key is pressed");
\t \t } else if (event.keyCode == keyLeft){
\t \t \t players.left = true;
\t \t \t console.log("Left key is pressed");
\t \t } else if (event.keyCode == keyRight){
\t \t \t players.right = true;
\t \t \t console.log("Right key is pressed");
\t \t }
\t }
\t window.addEventListener("keyup", checkKeyUp, false); \t
\t function checkKeyUp(e){
\t \t if (event.keyCode == keyUp){
\t \t \t players.up = false;
\t \t \t console.log("Up key is released");
\t \t } else if (event.keyCode == keyDown){
\t \t \t players.down = false;
\t \t \t console.log("Down key is released");
\t \t } else if (event.keyCode == keyLeft){
\t \t \t players.left = false;
\t \t \t console.log("Left key is released");
\t \t } else if (event.keyCode == keyRight){
\t \t \t players.right = false;
\t \t \t console.log("Right key is released");
\t \t }
\t }
\t document.onmousemove = mouseMove;//Detectando posição do mouse;
\t function mouseMove(e) {
\t \t e = e || window.event
\t \t mouseX = e.pageX;
\t \t mouseY = e.pageY;
\t \t document.getElementById('demo').innerHTML = mouseX + " " + mouseY;
\t }
//Here is where the bullet begins:
\t function bullet(){
\t \t this.x = players.x;
\t \t this.y = players.y;
\t \t this.width = 5;
\t \t this.height = 5;
\t \t this.speed = 20;
\t \t var dX = mouseX - players.x;
\t \t var dY = mouseY - players.y;
\t \t var distance = Math.sqrt(dX*dX + dY*dY);
\t \t this.speedX = (dX/distance) * 10;
\t \t this.speedY = (dY/distance) * 10;
\t }
\t Bullet = new Array();
\t canvas.onmousedown = function() {
Bullet.push(new bullet())
\t \t tiros++;
\t \t bullets = Bullet[tiros];
\t \t document.getElementById('demo2').innerHTML = tiros;
};
}
function play(){
\t intervalo = setInterval(animate, 1000/60);
}
function animate(){
\t ctx.clearRect(0,0,canvas.width,canvas.height);// Os if's tem q estar em uma ordem específica onde o if que detecta o movimento tem q estar antes do if q detecta a colisão com o muro.
\t //Key detection, that makes the player move.
\t if (players.up){
\t \t players.y -= players.speed;
\t }
\t if (players.down){
\t \t players.y += players.speed;
\t }
\t if (players.right){
\t \t players.x += players.speed;
\t }
\t if (players.left){
\t \t players.x -= players.speed;
\t }
\t // End
\t //Detecção de colisão no muro
\t if (players.y < 50){
\t \t players.y += players.speed;
\t }
\t if (players.y > canvas.height - players.height - 50){
\t \t players.y -= players.speed;
\t }
\t if (players.x < 50){
\t \t players.x += players.speed;
\t }
\t if (players.x > canvas.width - players.width - 50){
\t \t players.x -= players.speed;
\t }
\t //end
\t ctx.fillStyle = "brown";
\t ctx.beginPath();
\t ctx.moveTo(0,0);
\t ctx.lineTo(50,50);
\t ctx.moveTo(0,500);
\t ctx.lineTo(50,450);
\t ctx.moveTo(700,0);
\t ctx.lineTo(650,50);
\t ctx.moveTo(700,500);
\t ctx.lineTo(650,450);
\t ctx.strokeRect(50,50,600,400);
\t ctx.stroke();
\t angleToTurn = -Math.atan2((mouseX-15) - players.x, (mouseY-15) - players.y)*(180/Math.PI);//Pega a posição do players.x e do mouse para criar o angulo de movimento;
\t for (var z = 0; z < Orbital.length; z++){
\t \t ctx.fillStyle = "red";
\t \t orbitals = Orbital[z];
\t \t orbitals.angle = angleToTurn+85;
\t \t orbitals.x = players.x+(orbitals.radius*Math.cos(orbitals.angle*(Math.PI/180)))+(players.width/2)-2;
\t \t orbitals.y = players.y+(orbitals.radius*Math.sin(orbitals.angle*(Math.PI/180)))+(players.height/2)-2;
\t \t if (orbitals.angle > 360){
\t \t \t orbitals.angle = 0;
\t \t }
\t \t ctx.fillRect(orbitals.x,orbitals.y,orbitals.width,orbitals.height);
\t }
//Here is the part that returns undefined at the console log
\t if (tiros >= 1){
\t \t bullets.x += bullets.speedX;
\t \t bullets.y += bullets.speedY;
\t \t document.getElementById('demo2').innerHTML = "if";
\t \t ctx.fillRect(bullets.x,bullets.y,bullets.width,bullets.height);
\t }
\t ctx.fillStyle = "black";
\t ctx.fillRect(players.x,players.y,players.width,players.height);
}<html>
\t <head>
\t \t <meta charset="utf-8">
\t \t <link rel="stylesheet" type="text/css" href="css/estilo.css">
\t \t <script src="js/main.js"></script>
\t </head>
\t <body onload="load()">
\t \t <canvas id="box" width="700" height="500"></canvas>
\t \t <button onclick="play()">Go</button>
\t \t <h1 id="demo">Teste</h1>
\t \t <h1 id="demo2"></h1>
\t </body>
</html>
的'泰罗斯++'和'子弹=子弹交换顺序[泰罗斯]' –