我在HTML中使用JavaScript制作了游戏。游戏运行顺利。但我希望用户首先输入名称，然后开始游戏。游戏结束后，我想将分数和用户保留在数据库中。但是当我编写以下代码时，该页面根本不起作用。我在哪里犯错误？ 没有数据库连接问题。我是否在错误的地方编写了PHP代码？
Game.php
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Gamedev Canvas Workshop</title>
<style>
* { padding: 0; margin: 0; }
canvas { background: #eee; display: block; margin: 0 auto; }
</style>
<script src="randomColor.js"></script>
<script src="jquery-3.2.1.min.js"></script>
<link href="css/bootstrap.min.css" rel="stylesheet" type="text/css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
</head>
<body>
<?php
require("Database.php");
if ($_SERVER['REQUEST_METHOD']=="POST"){
$username = $_POST["Username"];
}
$sql = "INSERT INTO `scoreboard` (`Username`) VALUES ('$username')";
if (mysqli_query($conn, $sql)) {
//echo "New record created successfully";
} else {
echo mysqli_error($conn);
?>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post">
<canvas id="myCanvas" width="480" height="320"></canvas>
<label name="Username" id="username-label" style="display:none"></label>
<?php }?>
<label name="Score" id="score-label" style="display:none"></label>
</form>
<script>
var username = prompt("İnput the username: ");
document.getElementById("username-label").innerHTML= username;
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 2; //2
var dy = -2;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width-paddleWidth)/2;
var rightPressed = false;
var leftPressed = false;
var brickRowCount = 5;
var brickColumnCount = 3;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var score = 0;
var lives = 3;
var color = "#0095DD";
var bricks = [];
for(c=0; c<brickColumnCount; c++) {
bricks[c] = [];
for(r=0; r<brickRowCount; r++) {
bricks[c][r] = { x: 0, y: 0, status: 1 };
}
}
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
function random_color()
{
color = randomColor();
}
function keyDownHandler(e) {
if(e.keyCode == 39) {
rightPressed = true;
}
else if(e.keyCode == 37) {
leftPressed = true;
}
}
function keyUpHandler(e) {
if(e.keyCode == 39) {
rightPressed = false;
}
else if(e.keyCode == 37) {
leftPressed = false;
}
}
function collisionDetection() {
for(c=0; c<brickColumnCount; c++) {
for(r=0; r<brickRowCount; r++) {
var b = bricks[c][r];
if(b.status == 1) {
if(x > b.x && x < b.x+brickWidth && y > b.y && y < b.y+brickHeight) {
dy = -dy;
b.status = 0;
random_color(); //brick lere vurdukça top renk değiştircek.
score++;
document.getElementById("score-label").innerHTML=score;
if(score == brickRowCount*brickColumnCount) {
alert("YOU WIN, CONGRATS!");
<?php
require("Database.php");
if ($_SERVER['REQUEST_METHOD']=="POST"){
$score = $_POST["score-label"];
}
$sql = "INSERT INTO `scoreboard` (`Score`) VALUES ('$score')";
if (mysqli_query($conn, $sql)) {
//echo "New record created successfully";
} else {
echo mysqli_error($conn);
}
?>
document.location.reload();
}
}
}
}
}
}
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI*2);
ctx.fillStyle = color;
ctx.fill();
ctx.closePath();
}
function drawPaddle() {
ctx.beginPath();
ctx.rect(paddleX, canvas.height-paddleHeight, paddleWidth, paddleHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
function drawBricks() {
for(c=0; c<brickColumnCount; c++) {
for(r=0; r<brickRowCount; r++) {
if(bricks[c][r].status == 1) {
var brickX = (r*(brickWidth+brickPadding))+brickOffsetLeft;
var brickY = (c*(brickHeight+brickPadding))+brickOffsetTop;
bricks[c][r].x = brickX;
bricks[c][r].y = brickY;
ctx.beginPath();
ctx.rect(brickX, brickY, brickWidth, brickHeight);
ctx.fillStyle = "#0095DD";
ctx.fill();
ctx.closePath();
}
}
}
}
function drawLives() {
ctx.font = "16px Arial";
ctx.fillStyle = "#0095DD";
ctx.fillText("Lives: "+lives, canvas.width-65, 20);
}
function drawScore() {
ctx.font = "16px Arial";
ctx.fillStyle = "#0095DD";
ctx.fillText("Score: "+score, 8, 20);
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBricks();
drawBall();
drawPaddle();
drawScore();
drawLives();
collisionDetection();
if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
dx = -dx;
}
if(y + dy < ballRadius) {
dy = -dy;
}
else if(y + dy > canvas.height-ballRadius) {
if(x > paddleX && x < paddleX + paddleWidth) {
dy = -dy;
}
else {
lives--;
if(!lives) {
alert("GAME OVER");
<?php
require('Database.php');
if ($_SERVER['REQUEST_METHOD']=="POST"){
$score = $_POST["score-label"];
}
$sql = "INSERT INTO `scoreboard` (`Score`) VALUES ('$score')";
if (mysqli_query($conn, $sql)) {
//echo "New record created successfully";
}
else {
echo mysqli_error($conn);
}
mysqli_close($conn);
?>
document.location.reload();
}
else {
x = canvas.width/2;
y = canvas.height-30;
dx = 2; //2
dy = -2; //-2
paddleX = (canvas.width-paddleWidth)/2;
}
}
}
if(rightPressed && paddleX < canvas.width-paddleWidth) {
paddleX += 7;
}
else if(leftPressed && paddleX > 0) {
paddleX -= 7;
}
x += dx;
y += dy;
requestAnimationFrame(draw);
}
draw();
</script>
</body>
</html>
database.php中
<?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "game";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $database);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
//echo "Connected successfully";
?>