我需要使用 div 标签和文档对象模型在 HTML5 中开发一个滑动益智游戏。我设法获得了一个工作版本，但我遇到了瓷砖问题的错位。请看看我到目前为止所做的尝试：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Sliding Tiles</title>
<style type="text/css">
h1 {position:absolute; left:100px; font-family:arial}
p {position:absolute; left:100px; top:60px; color:red; font-family:arial; font-weight:bold}
.board {position:absolute; left:100px; width:400px; top:100px; height:400px; background-color:black; border-style:none}
div {position:absolute; width:94px; height:94px; background-color:aqua; border-style:solid; border-width:3px;
text-align:center; font-family:century; font-weight:bold; font-size:60px}
button {position:absolute; left:150px; width:300px; top:550px; height:50px;
background-color:silver; font-family:arial; font-weight:bold; font-size:30px}
</style>
<script>
var rows = new Array(3)
rows[0] = new Array (3)
rows[1] = new Array (3)
rows[2] = new Array (3)
rows[3] = new Array (3)
function checkWin() {
var winner = false
var checker = new Array(3)
checker[0] = new Array (1, 2, 3, 4)
checker[1] = new Array (5, 6, 7, 8)
checker[2] = new Array (9, 10, 11, 12)
checker[3] = new Array (13, 14, 15, 0)
for (i = 0; i < 4; i++){
for (j = 0; j < 4; j++){
if (rows[i][j] == checker[i][j]){
winner = false
}
}
}
if (winner){
alert("Congratulations! You've Won!")
return true
}
return false
}
function move(tile){
var obj = document.getElementById('tile' + tile)
var win = false
for (i = 0; i < 4; i++){
for (j = 0; j < 4; j++){
if (rows[i][j] == tile){
if (j == 1 && rows[i][j - 1] == 0){
obj.style.left = (j - 2) * 100 + 'px'
rows[i][j - 1] = tile
rows[i][j] = 0
}
else if (j == 2 && rows[i][j + 1] == 0){
obj.style.left = (j + 2) * 100 + 'px'
rows[i][j + 1] = tile
rows[i][j] = 0
}
else if (j == 2 && rows[i][j - 1] == 0){
obj.style.left = (j - 2) * 100 + 'px'
rows[i][j - 1] = tile
rows[i][j] = 0
}
else if (j < 4 && rows[i][j + 1] == 0){
obj.style.left = (j + 2) * 100 + 'px'
rows[i][j + 1] = tile
rows[i][j] = 0
}else if (i > 0 && rows[i - 1][j] == 0){
obj.style.top = (i - 2) * 100 + 'px'
rows[i - 1][j] = tile
rows[i][j] = 0
}else if (i < 4 && rows[i + 1][j] == 0){
obj.style.top = (i + 2) * 100 + 'px'
rows[i + 1][j] = tile
rows[i][j] = 0
}
win = checkWin()
if (win){
break
}
return
}
}
}
}
function initialize(){
var check = new Array (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
if (i == 3 && j == 3){
rows[i][j] = 0
} else {
var n = Math.ceil(Math.random() * 15)
while (check[n - 1] == 0){
n = Math.ceil(Math.random() * 15)
}
rows[i][j] = n
check[n - 1] = 0
document.getElementById('tile' + n).style.left = (j + 1) * 100 + 'px'
document.getElementById('tile' + n).style.top = (i + 1) * 100 + 'px'
}
}
}
}
</script>
</head>
<body>
<h1>Sliding Tiles
<p>After starting a game, just click on the tile you'd like to move...</p>
<div class="board" id="board"></div>
<div id="tile1" style="left:100px; top:100px" onclick="move(1)">
1
</div>
<div id="tile2" style="left:200px; top:100px" onclick="move(2)">
2
</div>
<div id="tile3" style="left:300px; top:100px" onclick="move(3)">
3
</div>
<div id="tile4" style="left:400px; top:100px" onclick="move(4)">
4
</div>
<div id="tile5" style="left:100px; top:200px" onclick="move(5)">
5
</div>
<div id="tile6" style="left:200px; top:200px" onclick="move(6)">
6
</div>
<div id="tile7" style="left:300px; top:200px" onclick="move(7)">
7
</div>
<div id="tile8" style="left:400px; top:200px" onclick="move(8)">
8
</div>
<div id="tile9" style="left:100px; top:300px" onclick="move(9)">
9
</div>
<div id="tile10" style="left:200px; top:300px" onclick="move(10)">
10
</div>
<div id="tile11" style="left:300px; top:300px" onclick="move(11)">
11
</div>
<div id="tile12" style="left:400px; top:300px" onclick="move(12)">
12
</div>
<div id="tile13" style="left:100px; top:400px" onclick="move(13)">
13
</div>
<div id="tile14" style="left:200px; top:400px" onclick="move(14)">
14
</div>
<div id="tile15" style="left:300px; top:400px" onclick="move(15)">
15
</div>
<form action="">
<button onclick="initialize(); return false">Start a New Game</button>
</form>
</body>
</html>
看看问题：
http://prntscr.com/14rivu http://prntscr.com/14rj9q
有什么想法可以防止瓷砖从盒子里移出来吗？