Javascript游戏的奇怪问题
Weird issue with Javascript game
好吧，所以我是JS的新手，所以我正在尝试制作基本的"突破"游戏。我想做的是将砖块排列成三角形（或者更准确地说，在没有砖块的情况下形成三角形）。但是，当我在2D数组中选择要等于0（无砖）的项目时，它只允许我选择一个。之后，游戏根本无法加载。
最奇怪的是，它只接受这部分的第一行。无论我改变什么，第二行向前将导致游戏无法加载：
bricks[0][10]=0;
bricks[7][16]=0;
bricks[7][15]=0;
bricks[7][14]=0;
bricks[7][13]=0;
bricks[7][12]=0;
bricks[7][11]=0;
bricks[7][10]=0;
bricks[7][9]=0;
bricks[7][8]=0;
bricks[7][7]=0;
bricks[7][6]=0;
bricks[7][5]=0;
bricks[7][4]=0;
bricks[7][3]=0;
bricks[7][17]=0;
bricks[6][4]=0;
bricks[6][16]=0;
bricks[5][15]=0;
bricks[5][5]=0;
bricks[4][14]=0;
bricks[4][6]=0;
bricks[3][13]=0;
bricks[3][7]=0;
bricks[2][8]=0;
bricks[2][12]=0;
bricks[1][11]=0;
bricks[1][9]=0;
此外，我知道代码是不完整和有缺陷的。它还没有完成，仍然需要大量的润色。这是我的全部代码
canvasApp();
function canvasApp(){
var canvas=document.getElementById("canvas")
if (!canvas || !canvas.getContext){
return;
}
var ctx = canvas.getContext("2d");
if (!ctx) {
return
}
//Application States
const GAME_STATE_TITLE = 0;
const GAME_STATE_NEW_LEVEL = 1;
const GAME_STATE_GAME_OVER = 2;
var currentGameState = 0;
var currentGameStateFunction = null;
var brickcount;
var bouncecount = 0;
//Initialise Start Screen State
var titleStarted = false;
var gameStarted = false;
var gameOver = false;
var keyPressList = [];
var keys = false //mouse or keys. false = mouse control, vice versa
var difficulty = 0;
// Declarations for the game
var dx = 6;
var dy = 6;
var x = 150;
var y = 100;
var r = 10;
var WIDTH = 500;
var HEIGHT = 400;
var ballx = 200;
var bally = 200;
var paddlex = WIDTH/1.2;
var paddleh = 10;
var paddlew = 75;
var paddledx = 30
var mouseX;
var bricks;
var NROWS;
var NCOLS;
var BRICKWIDTH;
var BRICKHEIGHT;
var PADDING;
var rowcolours = ["#FF1C0A", "#FFFD0A", "#00A308", "#0008DB", "#EB0093"];
var paddlecolour = "#FF00FF";
var ballcolour = "#00FFFF";
var backcolour = "#0000FF";
function initbricks() {
NROWS = 9
NCOLS = 21
brickcount = NROWS*NCOLS;
BRICKWIDTH = (WIDTH/NCOLS) - 1;
BRICKHEIGHT = 10;
PADDING = 1;
bricks = new Array(NROWS);
for (i=0; i < NROWS; i++) {
bricks[i] = new Array(NCOLS);
for (j=0; j < NCOLS; j++) {
bricks[i][j] = 1;
}
bricks[0][10]=0;
bricks[7][16]=0;
bricks[7][15]=0;
bricks[7][14]=0;
bricks[7][13]=0;
bricks[7][12]=0;
bricks[7][11]=0;
bricks[7][10]=0;
bricks[7][9]=0;
bricks[7][8]=0;
bricks[7][7]=0;
bricks[7][6]=0;
bricks[7][5]=0;
bricks[7][4]=0;
bricks[7][3]=0;
bricks[7][17]=0;
bricks[6][4]=0;
bricks[6][16]=0;
bricks[5][15]=0;
bricks[5][5]=0;
bricks[4][14]=0;
bricks[4][6]=0;
bricks[3][13]=0;
bricks[3][7]=0;
bricks[2][8]=0;
bricks[2][12]=0;
bricks[1][11]=0;
bricks[1][9]=0;
}
}
initbricks();
function switchGameState(newState) {
currentGameState = newState;
switch (currentGameState) {
case GAME_STATE_TITLE:
currentGameStateFunction = gameStateTitle;
break;
case GAME_STATE_NEW_LEVEL:
currentGameStateFunction = gameStatePlayLevel;
break;
case GAME_STATE_GAME_OVER:
currentGameStateFunction = gameStateGameOver;
break;
}
}
function gameStateTitle(){
if (titleStarted != true){
ctx.fillStyle = '#000000';
ctx.fillRect(0,0,500,400);
ctx.fillStyle = '#ffffff';
ctx.font = '20px _sans';
ctx.textBaseline = 'top';
ctx.fillText ("Breakout!", 200,150);
ctx.fillText ("Press Space to Play", 170,200);
if (keys == 0 ) {
ctx.fillText ("Mouse selected", 180,250);
ctx.fillText ("Press k to switch to keys", 140,300);
} else {
ctx.fillText ("Keys selected", 190,250);
ctx.fillText ("Press m to switch to mouse", 140,300);
}
titleStarted = true;
}else{
if (keyPressList[75] == true){
keys = 1;
titleStarted = false;
gameStateTitle(); // Redraw the title page
}
if (keyPressList[77] == true){
keys = 0;
titleStarted = false;
gameStateTitle();
}
if (keyPressList[32] == true){
switchGameState(GAME_STATE_NEW_LEVEL);
titleStarted = false;
}
}
}
function gameStatePlayLevel(){
ctx.fillStyle = '#000000';
ctx.fillRect(0,0,500,400);
ctx.fillStyle = '#ffffff';
// Update the game state and check for game over
function update() {
x+=dx
y+=dy
if (keys == 0) {
paddlex = mouseX;
}else{
if (keyPressList[37]==true){
paddlex-=paddledx;
}
if (keyPressList[39]==true){
paddlex+=paddledx;
}
}
//have we hit a brick?
rowheight = BRICKHEIGHT + PADDING;
colwidth = BRICKWIDTH + PADDING;
row = Math.floor(y/rowheight);
col = Math.floor(x/colwidth);
//if so, reverse the ball and mark the brick as broken
if (y < NROWS * rowheight && row >= 0 && col >= 0 && bricks[row][col] == 1) {
dy = -dy;
bricks[row][col] = 0;
brickcount--;
if (brickcount == 0) {
switchGameState(GAME_STATE_NEW_LEVEL);
difficulty+=1;
initbricks();
x=250;
y=200 + (difficulty*20);
brickcount=NROWS*NCOLS;
bouncecount=0;
}
}
if( x<0 || x>WIDTH) dx=-dx;
if( y<0 || y>HEIGHT) dy=-dy;
else if (y + dy > HEIGHT) {
if (x > paddlex && x < paddlex + paddlew) {
dx = 8 * ((x-(paddlex+paddlew/2))/paddlew);
dy = -dy;
bouncecount++;
}
else {
//game over, so stop the animation
switchGameState(GAME_STATE_GAME_OVER);
initbricks();
}
}
}
function render() {
ctx.save();
function circle(x,y,r) {
ctx.beginPath();
ctx.arc(x, y, r, 0, Math.PI*2, true);
ctx.fill();
}
function rect(x,y,w,h) {
ctx.beginPath();
ctx.rect(x,y,w,h);
ctx.closePath();
ctx.fill();
ctx.stroke();
}
//draw bricks
for (i=0; i < NROWS; i++) {
ctx.fillStyle = rowcolours [i];
for (j=0; j < NCOLS; j++) {
if (bricks[i][j] == 1) {
rect((j * (BRICKWIDTH + PADDING)) + PADDING,
(i * (BRICKHEIGHT + PADDING)) + PADDING, BRICKWIDTH, BRICKHEIGHT);
}
}
}
circle(x, y, 10);
// init_paddle();
ctx.fillStyle = paddlecolour;
rect (paddlex, HEIGHT-paddleh, paddlew, paddleh);
ctx.restore();
show_result()
}
update();
render();
}
function gameStateGameOver(){
if (gameOver != true){
bouncecount=0;
ctx.fillStyle = '#000000';
ctx.fillRect(0,0,500,400);
ctx.fillStyle = '#ffffff';
ctx.font = '20px _sans';
ctx.textBaseline = 'top';
ctx.fillText ("Game over", 200,150);
ctx.fillText ("Press Space to Restart", 160,200);
ctx.fillText ("You completed " + difficulty + " levels", 160,240);
difficulty=0;
gameOver = true;
}else{
if (keyPressList[32] == true){
switchGameState(GAME_STATE_TITLE);
gameOver = false;
}
}
}
function runGame(){
currentGameStateFunction();
}
// Key handler
document.onkeydown = function(e){
e= e?e:window.event;
keyPressList[e.keyCode] = true;
}
document.onkeyup = function(e){
e= e?e:window.event;
keyPressList[e.keyCode] = false;
}
function onMouseMove(evt) {
// Event data passes to this function
mouseX = evt.clientX-canvas.offsetLeft - paddlew/2;
// Assign the relative position of the mouse in the canvas to mouseX
mouseY = evt.clientY-canvas.offsetTop;
//Do the same for mouseY
document.title="("+mouseX+","+mouseY+")";
//Put the mouse X and Y in the title for info
paddlex = mouseX;
// Position the paddle
}
canvas.addEventListener("mousemove",onMouseMove, false);
//Application start
switchGameState(GAME_STATE_TITLE);
const FRAME_RATE = 40;
var intervalTime = 1000/FRAME_RATE;
setInterval(runGame, intervalTime);
function show_result(){
ctx.fillText ("There are " + brickcount + " bricks", 160,200);
ctx.fillText ("Paddle bounces are " + bouncecount , 160,220);
}
}
使用适当的缩进，您的代码看起来像这样：
bricks = new Array(NROWS);
for (i=0; i < NROWS; i++) {
bricks[i] = new Array(NCOLS);
for (j=0; j < NCOLS; j++) {
bricks[i][j] = 1;
}
bricks[0][10]=0;
bricks[7][16]=0;
换句话说，当只创建了bricks[0]时，您正试图在第一次迭代中访问bricks[7]。在运行覆盖列表之前，使用}正确关闭第一个for循环。
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