贪吃蛇Js
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<!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></title>
<style type="text/css">
.style1
{
border-collapse:collapse;
}
td
{
width:40px;
height:40px;
border:solid 1px blue;
text-align: center;
}
</style>
</head>
<body >
<table id="table1" class="style1" cellpadding="0" align="center">
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</table>
<!--<span id="span1"></span>-->
<script type="text/javascript">
var width=10;
var height=10;
var direction="down";
var Point = function(x, y)
{
this.x = x;
this.y = y;
}
var egg = new Point(1, 1);
var createRandomEgg = function()
{
var tempx = Math.random() * width;
egg.x = Math.floor(tempx);
var tempy = Math.random() * height;
egg.y = Math.floor(tempy);
}
var snake = new Array();
snake[0] = new Point(0, 0);
snake[1] = new Point(1, 0);
snake[2] = new Point(2, 0);
var nextPositionOfHead = function()
{
switch (direction)
{
case "left":
return new Point(snake[snake.length - 1].x - 1, snake[snake.length - 1].y);
break;
case "right":
return new Point(snake[snake.length - 1].x + 1, snake[snake.length - 1].y);
case "up":
return new Point(snake[snake.length - 1].x, snake[snake.length - 1].y - 1);
case "down":
return new Point(snake[snake.length - 1].x, snake[snake.length - 1].y + 1);
default:
alert("错误!");
}
}
var insertEggToHead = function()
{
snake[snake.length] = new Point(egg.x, egg.y);
}
var move = function()
{
if (nextPositionOfHead().x > width - 1 || nextPositionOfHead().y > height - 1) {
alert("撞墙啦！");
clearInterval(a);
return;
}
if (nextPositionOfHead().x == egg.x && nextPositionOfHead().y == egg.y) {
insertEggToHead();
createRandomEgg();
refresh();
return;
}
for (i = 0; i < snake.length - 1; i++) {
snake[i].x = snake[i + 1].x;
snake[i].y = snake[i + 1].y;
}
snake[snake.length - 1].x = nextPositionOfHead().x;
snake[snake.length - 1].y = nextPositionOfHead().y;
refresh();
}
function refresh()
{
var t = document.getElementById("table1");
for (var j = 0; j < width; j++) {
for (var k = 0; k < height; k++) {
t.rows[k].cells[j].style.cssText = "background-color:white;";
}
}
t.rows[egg.y].cells[egg.x].style.cssText = "background-color:red;";
for (i = 0; i < snake.length; i++) {
// span1.innerHTML += "(" + snake[i].x + "," + snake[i].y + "---"+")";
t.rows[snake[i].y].cells[snake[i].x].style.cssText = "background-color:yellow;";
}
}
function keyDown()
{
switch (event.keyCode) {
case 37:
direction="left"; break;
case 38:
direction="up"; break;
case 39:
direction="right"; break;
case 40:
direction="down"; break;
}
}
document.onkeydown = keyDown;
var a = setInterval("move()", 500);
move();
</script>
</body>
</html>
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