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JavaScript数独求解器

2015-07-04 23:31 603 查看

<html>
<head>
<style type="text/css">
.txt {
width: 50;
height: 50;
background-color: black;
color: white;
text-align: center;
font-family: Consolas;
font-size: 40;
}

.btn {
width: 200;
height: 60;
text-align: center;
font-family: 楷体;
font-size: 40;
color: white;
background-color: black;
}
</style>
</head>
<h1 align="center">请输入已知的数字</h1>
<script type="text/javascript">
init();
var a = new Array(81);
var over = false;
function run() {
if (cin() == false)
document.getElementById('re').innerHTML = '输入不合法';
else {
over = false;
document.getElementById('re').innerHTML = '正在运行';
go(0, 0);
if (over) {
cout();
document.getElementById('re').innerHTML = '运行结束';
} else
document.getElementById('re').innerHTML = '条件太少,没找到答案';
}
}
function cout() {
for (var i = 0; i < 81; i++) {
document.getElementById('grid' + i).value = a[i];
}
}
function cin() {
for (var i = 0; i < 81; i++) {
a[i] = document.getElementById('grid' + i).value;
if (a[i] == undefined || a[i] == '')
a[i] = 0;
}
return true;
}
function canBe(x, y, v) {
for (var i = 0; i < 9; i++) {
if (i != x && v == a[i * 9 + y])
return false;
else if (i != y && v == a[x * 9 + i])
return false;
}
var xx=Math.floor(x/3)*3;
var yy=Math.floor(y/3)*3;
for (var i = xx; i < xx + 3; i++) {
for (var j = yy; j < yy + 3; j++) {
if (a[i * 9 + j] == v && (i != x || y != j))
return false;
}
}
return true;
}
function next(x, y) {
var z = x * 9 + y + 1;
if (z == 81)
over = true;
else
go( Math.floor(z/9), z % 9);
}
function go(x, y) {
if (a[x * 9 + y] == 0) {
for (var i = 1; i <= 9; i++) {
if (canBe(x, y, i)) {
a[x * 9 + y] = i;
next(x, y);
if (over)
return;
}
}
a[x * 9 + y] = 0;
} else {
next(x, y);
}
}
function clr() {
for (var i = 0; i < 81; i++)
document.getElementById('grid' + i).value = '';
}
function init() {
document.write("<table align='center'>");
for (var i = 0; i < 9; i++) {
document.write("<tr>");
for (var j = 0; j < 9; j++) {
document
.write("<td><input type='text' maxlength=1 class='txt' id='grid"
+ (i * 9 + j) + "'></input></td>");
}
document.write("</tr>");
}
document.write("</table>");
}
</script>
<input type="button" value='清空' class='btn' onclick="clr()"></input>
<input type="button" value='运行' class='btn' onclick="run()"></input>
<h3 id='re'>weidiao</h3>
<h3 id='haha'></h3>
</html>

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