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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>2048</title>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<script>
var board = [
["", "", "", ""],
["", "", "", ""],
["", "", "", ""],
["", "", "", ""],
];
var score = 0;
function page_load() {
document.addEventListener("keyup", function (event) {
switch (event.key) {
case "ArrowUp": {
moveVertical("up");
break;
}
case "ArrowDown": {
moveVertical("down");
break;
}
case "ArrowRight": {
moveHorizontal("right");
break;
}
case "ArrowLeft": {
moveHorizontal("left");
break;
}
}
});
}
function moveVertical(str) {
var col1 = [board[0][0], board[1][0], board[2][0], board[3][0]];
var col2 = [board[0][1], board[1][1], board[2][1], board[3][1]];
var col3 = [board[0][2], board[1][2], board[2][2], board[3][2]];
var col4 = [board[0][3], board[1][3], board[2][3], board[3][3]];
if (str == "down") {
slideRight(col1);
slideRight(col2);
slideRight(col3);
slideRight(col4);
} else if (str == "up") {
slideLeft(col1);
slideLeft(col2);
slideLeft(col3);
slideLeft(col4);
}
[board[0][0], board[1][0], board[2][0], board[3][0]] = col1;
[board[0][1], board[1][1], board[2][1], board[3][1]] = col2;
[board[0][2], board[1][2], board[2][2], board[3][2]] = col3;
[board[0][3], board[1][3], board[2][3], board[3][3]] = col4;
newNumber();
}
function moveHorizontal(str) {
if (str == "right") {
slideRight(board[0]);
slideRight(board[1]);
slideRight(board[2]);
slideRight(board[3]);
} else if (str == "left") {
slideLeft(board[0]);
slideLeft(board[1]);
slideLeft(board[2]);
slideLeft(board[3]);
}
newNumber();
}
function slideRight(ar) {
var ind = [];
ar.forEach((item, i) => {
if (item != "") ind.push(i);
});
for (var i = ind.length - 1; i >= 0; i--) {
if (i - 1 < 0) break;
if (ar[ind[i]] == ar[ind[i - 1]]) {
ar[ind[i]] = parseInt(
parseInt(ar[ind[i]]) + parseInt(ar[ind[i - 1]])
).toString();
ar[ind[i - 1]] = "";
updateScore(ar[ind[i]]);
}
}
ind = [];
ar.forEach((item, i) => {
if (item != "") ind.push(i);
});
if (ind.length > 0) {
for (var i = 3; i >= 0 && ind.length > 0; i--) {
ar[i] = ar[ind[ind.length - 1]];
if (i != ind[ind.length - 1]) {
ar[ind[ind.length - 1]] = "";
} else {
}
ind.length--;
}
}
return ar;
}
function slideLeft(ar) {
var ind = [];
ar.forEach((item, i) => {
if (item != "") ind.push(i);
});
for (var i = 0; i < ind.length; i++) {
if (i + 1 == ind.length) break;
if (ar[ind[i]] == ar[ind[i + 1]]) {
ar[ind[i]] = parseInt(
parseInt(ar[ind[i]]) + parseInt(ar[ind[i + 1]])
).toString();
ar[ind[i + 1]] = "";
updateScore(ar[ind[i]]);
}
}
ind = [];
ar.forEach((item, i) => {
if (item != "") ind.push(i);
});
if (ind.length > 0) {
for (var i = 0, j = 0; i <= 3, j < ind.length; i++, j++) {
ar[i] = ar[ind[j]];
if (i != ind[j]) {
ar[ind[j]] = "";
} else {
}
}
}
return ar;
}
function newNumber() {
if (!checkFull()) {
var newNum = Math.floor(Math.random() * 2) == 0 ? 2 : 4;
var b = "";
do {
var x = randomIndex();
var y = randomIndex();
b = board[x][y];
board[x][y] = board[x][y] == "" ? newNum.toString() : board[x][y];
} while (b != "" && checkFull() == false);
loadBoard();
} else {
if (checkComplete()) alert("Game over. Your score is: " + score);
}
}
function checkFull() {
for (var i = 0; i < 4; i++) {
for (var j = 0; j < 4; j++) {
if (board[i][j] == "") return false;
}
}
return true;
}
function checkComplete() {
for (var i = 0; i < 4; i++) {
for (var j = 0; j < 4; j++) {
if (j + 1 < 4) {
if (board[i][j] == board[i][j + 1]) return false;
if (board[j][i] == board[j + 1][i]) return false;
}
}
}
return true;
}
function randomIndex() {
return Math.floor(Math.random() * 4); // retruns a number between 0 and 3
}
function updateScore(val) {
score += parseInt(val);
p_score.innerHTML = "Score: " + score;
}
function loadBoard() {
c1.innerHTML = board[0][0];
c2.innerHTML = board[0][1];
c3.innerHTML = board[0][2];
c4.innerHTML = board[0][3];
c5.innerHTML = board[1][0];
c6.innerHTML = board[1][1];
c7.innerHTML = board[1][2];
c8.innerHTML = board[1][3];
c9.innerHTML = board[2][0];
c10.innerHTML = board[2][1];
c11.innerHTML = board[2][2];
c12.innerHTML = board[2][3];
c13.innerHTML = board[3][0];
c14.innerHTML = board[3][1];
c15.innerHTML = board[3][2];
c16.innerHTML = board[3][3];
var cells = tbl_board.getElementsByTagName("td");
for (var i = 0; i < cells.length; i++) {
switch (cells[i].innerHTML) {
case "2":
cells[i].style = "background-color: #fff9ed;";
break;
case "4":
cells[i].style = "background-color: #ffe0a8;";
break;
case "8":
cells[i].style = "background-color: #ffca68;";
break;
case "16":
cells[i].style = "background-color: #ef914a;";
break;
case "32":
cells[i].style = "background-color: #f28cc4;";
break;
case "64":
cells[i].style = "background-color: #ff6868;";
break;
case "128":
cells[i].style = "background-color: #d9f442;";
break;
case "256":
cells[i].style = "background-color: #afffe5;";
break;
case "512":
cells[i].style = "background-color: #84bdff;";
break;
case "1024":
cells[i].style = "background-color: #b9a8f4;";
break;
case "2048":
cells[i].style = "background-color: #be53fc;";
break;
default:
cells[i].style = "background-color: #eff2f7;";
break;
}
}
}
</script>
<style>
body {
font-family: "Lucida Sans";
}
#tbl_board {
width: 310px;
height: 310px;
margin: 30px auto;
}
#tbl_board td {
width: 76px;
height: 76px;
border: 1px solid burlywood;
text-align: center;
font-weight: bold;
font-size: 18pt;
background-color: #eff2f7;
}
#p_score {
text-align: center;
}
</style>
</head>
<body onload="page_load()">
<div>
<p>Use the arrow keys to play!</p>
<table id="tbl_board">
<tr>
<td id="c1"></td>
<td id="c2"></td>
<td id="c3"></td>
<td id="c4"></td>
</tr>
<tr>
<td id="c5"></td>
<td id="c6"></td>
<td id="c7"></td>
<td id="c8"></td>
</tr>
<tr>
<td id="c9"></td>
<td id="c10"></td>
<td id="c11"></td>
<td id="c12"></td>
</tr>
<tr>
<td id="c13"></td>
<td id="c14"></td>
<td id="c15"></td>
<td id="c16"></td>
</tr>
</table>
<p id="p_score">Score: 0</p>
</div>
</body>
</html>