Змейка на JavaScript

Напишем полноценную игру Змейка JavaScript.

Файл index.html

<div id="main" class="main">
<div class='line'><div data-n='1' class="0_0 s"></div><div class="0_1"></div><div class="0_2"></div><div class="0_3"></div><div class="0_4"></div><div class="0_5"></div><div class="0_6"></div><div class="0_7"></div><div class="0_8"></div><div class="0_9"></div></div>
<div class="line"><div class="1_0"></div><div class="1_1"></div><div class="1_2"></div><div class="1_3"></div><div class="1_4"></div><div class="1_5"></div><div class="1_6"></div><div class="1_7"></div><div class="1_8"></div><div class="1_9"></div></div><div class="line"><div class="2_0"></div><div class="2_1"></div><div class="2_2"></div><div class="2_3"></div><div class="2_4"></div><div class="2_5"></div><div class="2_6"></div><div class="2_7"></div><div class="2_8"></div><div class="2_9"></div></div>
<div class="line"><div class="3_0"></div><div class="3_1"></div><div class="3_2"></div><div class="3_3"></div><div class="3_4"></div><div class="3_5"></div><div class="3_6"></div><div class="3_7"></div><div class="3_8"></div><div class="3_9"></div></div><div class="line"><div class="4_0"></div><div class="4_1"></div><div class="4_2"></div><div class="4_3"></div><div class="4_4"></div><div class="4_5"></div><div class="4_6"></div><div class="4_7"></div><div class="4_8"></div><div class="4_9"></div></div>
<div class="line"><div class="5_0"></div><div class="5_1"></div><div class="5_2"></div><div class="5_3"></div><div class="5_4"></div><div class="5_5"></div><div class="5_6"></div><div class="5_7"></div><div class="5_8"></div><div class="5_9"></div></div><div class="line"><div class="6_0"></div><div class="6_1"></div><div class="6_2"></div><div class="6_3"></div><div class="6_4"></div><div class="6_5"></div><div class="6_6"></div><div class="6_7"></div><div class="6_8"></div><div class="6_9"></div></div>
<div class="line"><div class="7_0"></div><div class="7_1"></div><div class="7_2"></div><div class="7_3"></div><div class="7_4"></div><div class="7_5"></div><div class="7_6"></div><div class="7_7"></div><div class="7_8"></div><div class="7_9"></div></div><div class="line"><div class="8_0"></div><div class="8_1"></div><div class="8_2"></div><div class="8_3"></div><div class="8_4"></div><div class="8_5"></div><div class="8_6"></div><div class="8_7"></div><div class="8_8"></div><div class="8_9"></div></div>
<div class="line"><div class="9_0"></div><div class="9_1"></div><div class="9_2"></div><div class="9_3"></div><div class="9_4"></div><div class="9_5"></div><div class="9_6"></div><div class="9_7"></div><div class="9_8"></div><div class="9_9"></div></div>
</div>

Файл index.css

.main .line {
    clear: both;
}
.main .line div {
    width: 20px;
    height: 20px;
    float: left;
    margin: 1px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
    transition: background-color .5s;
}
.main .line div.s {
    background-color: #bbb;
    transition: background-color .5s;
}
.main .line div.f {
    background-color: green;
    transition: background-color 2s;
}

Файл index.js

(function(width, height, length, current, dx, dy, x, y, hasFood, newEl){     
    
document.body.onkeydown = function(e){
    dx = (e.keyCode - 38) % 2, dy = (e.keyCode - 39) % 2;
};
    
var timer = setInterval(function () {
    x = (x + dx) < 0 ? width - 1 : (x + dx) % width; 
    y = (y + dy) < 0 ? height - 1 : (y + dy) % height;
    newEl = document.getElementsByClassName(y + '_' + x)[0]
    if(newEl.className.indexOf('s') > 0) {
    clearInterval(timer), alert('Game Over! Score: ' + length)
    };
    if(newEl.className.indexOf('f') > 0) {
    newEl.className = newEl.className.replace(' f', ''), length++, hasFood = false;
    }
    newEl.className += ' s', newEl.setAttribute('data-n', current++);

    for(var i = 0, min = Infinity, item, items = document.getElementsByClassName('s'), len = items.length; i < len && len > length; i++)
    if(+items[i].getAttribute('data-n') < min)
    min = +items[i].getAttribute('data-n'), item = items[i];

    if(!!item) item.className = item.className.replace(' s', '');

    for(var fItem, fX, fY; !hasFood; fX = Math.round(Math.random() * 10 % width), fY = Math.round(Math.random() * 10 % height))
    if(!!fX && !!fY && document.getElementsByClassName(fY + '_' + fX)[0].className.indexOf('s') < 0)
    hasFood = true, document.getElementsByClassName(fY + '_' + fX)[0].className += ' f';
}, 1000);


})(10, 10, 5, 1, 1, 0, 0, 0, false, null);