好的，所以我有这个游戏，我想要更新高分，但每当我设置我的currentScore值为++时，它都不会增加。我不知道发生了什么，我相信这是一个简单的解决方案，如果有人能帮助我，我将不胜感激。问题出在第212行。我真的想解决这个问题，我希望能够快速简单地修复，以便我可以回去设计我的网站。
<!DOCTYPE html>
<html>
<head>
</head>
<body onload ="checkScore">
<script>
</script>
<p><span style="color:red">Your</span> <span style="color:orange">current</span> <span style="color:gold">High</span> <span style="color:green">Score</span> <span style="color:blue">is:</span>
<span id="SCORES" style="color:purple">0</span>
<input id="currentScore" value="0">
<script>
var cookie;
function setCookie(cname,cvalue,exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*365*7*24*60*60*1000));
var expires = "expires=" + d.toGMTString();
cookie = encodeURI(cname + "=" + cvalue + ";" + expires + ";path=/");
}
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(cookie);
var ca = decodedCookie.split(';');
for(var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return "";
}
function checkScore() {
// get current score
let currentScore = document.getElementById('currentScore').value;
//get high score from the "cookie"
let highScore = getCookie('highscore');
// if current score is bigger then high score - set new high score and update cookie
if (highScore < currentScore) {
highScore = currentScore;
setCookie("highscore", highScore, 365);
}
// update DOM
document.getElementById("SCORES").innerHTML = highScore;
}
// set inital cookie for this example to work
setCookie("highscore", 0, 365);
var
COLS = 26,
ROWS = 26,
EMPTY = 0,
SNAKE = 1,
FRUIT = 2,
LEFT = 0,
UP = 1,
RIGHT = 2,
DOWN = 3,
KEY_LEFT = 65,
KEY_UP = 87,
KEY_RIGHT = 68,
KEY_DOWN = 83,
canvas,
ctx,
keystate,
frames,
score;
currentScore;
grid = {
width: null,
height: null,
_grid: null,
init: function(d, c, r) {
this.width = c;
this.height = r;
this._grid = [];
for (var x=0; x < c; x++) {
this._grid.push([]);
for (var y=0; y < r; y++) {
this._grid[x].push(d);
}
}
},
set: function(val, x, y) {
this._grid[x][y] = val;
},
get: function(x, y) {
return this._grid[x][y];
}
}
snake = {
direction: null,
last: null,
_queue: null,
init: function(d, x, y) {
this.direction = d;
this._queue = [];
this.insert(x, y);
},
insert: function(x, y) {
this._queue.unshift({x:x, y:y});
this.last = this._queue[0];
},
remove: function() {
return this._queue.pop();
}
};
function setFood() {
var empty = [];
for (var x=0; x < grid.width; x++) {
for (var y=0; y < grid.height; y++) {
if (grid.get(x, y) === EMPTY) {
empty.push({x:x, y:y});
}
}
}
var randpos = empty[Math.round(Math.random()*(empty.length - 1))];
grid.set(FRUIT, randpos.x, randpos.y);
}
function main() {
canvas = document.createElement("canvas");
canvas.width = COLS*20;
canvas.height = ROWS*20;
ctx = canvas.getContext("2d");
document.body.appendChild(canvas);
ctx.font = "18px Helvetica";
frames = 0;
keystate = {};
document.addEventListener("keydown", function(evt) {
keystate[evt.keyCode] = true;
});
document.addEventListener("keyup", function(evt) {
delete keystate[evt.keyCode];
});
init();
loop();
}
function init() {
score = 0;
currentScore = 0;
grid.init(EMPTY, COLS, ROWS);
var sp = {x:Math.floor(COLS/2), y:ROWS-1};
snake.init(UP, sp.x, sp.y);
grid.set(SNAKE, sp.x, sp.y);
setFood();
}
function loop() {
update();
draw();
window.requestAnimationFrame(loop, canvas);
}
function update() {
frames++;
if (keystate[KEY_LEFT] && snake.direction !== RIGHT) {
snake.direction = LEFT;
}
if (keystate[KEY_UP] && snake.direction !== DOWN) {
snake.direction = UP;
}
if (keystate[KEY_RIGHT] && snake.direction !== LEFT) {
snake.direction = RIGHT;
}
if (keystate[KEY_DOWN] && snake.direction !== UP) {
snake.direction = DOWN;
}
if (frames%5 === 0) {
var nx = snake.last.x;
var ny = snake.last.y;
switch (snake.direction) {
case LEFT:
nx--;
break;
case UP:
ny--;
break;
case RIGHT:
nx++;
break;
case DOWN:
ny++;
break;
}
if (0 > nx || nx > grid.width-1 ||
0 > ny || ny > grid.height-1 ||
grid.get(nx, ny) === SNAKE
) {
return init();
}
if (grid.get(nx, ny) === FRUIT) {
score++;
currentScore++;
checkScore();
setFood();
} else {
var tail = snake.remove();
grid.set(EMPTY, tail.x, tail.y);
}
grid.set(SNAKE, nx, ny);
snake.insert(nx, ny);
}
}
function draw() {
var tw = canvas.width/grid.width;
var th = canvas.height/grid.height;
for (var x=0; x < grid.width; x++) {
for (var y=0; y < grid.height; y++) {
switch (grid.get(x, y)) {
case EMPTY:
ctx.fillStyle = "#000";
break;
case SNAKE:
ctx.fillStyle = "#4aa024";
break;
case FRUIT:
ctx.fillStyle = "#f00";
break;
}
ctx.fillRect(x*tw, y*th, tw, th);
}
}
ctx.fillStyle = "#49c2ff";
ctx.fillText("SCORE: " + score, 10, canvas.height-10);
}
main();
</script>
</body>
</html>
答案 0 :(得分：0)
我不知道第212行是什么，我不会指望。我看到的是这个：
score++;
currentScore++;
checkScore();
其中checkScore()然后将值重置为UI元素中的值。
let currentScore = document.getElementById('currentScore').value;
答案 1 :(得分：0)
你有一个全局变量框架，问题是window.frames也存在。因此，您不能将frames用作变量。将其更改为其他内容。
答案 2 :(得分：0)
答案确实如此
let currentScore = document.getElementById('currentScore').value = score;
再次感谢马特的帮助！