Skip welcome & menu and move to editor
Welcome to JS Bin
File
Add library
Share
Login or Register
Blog
Help
Load cached copy from
  • Run with JS
  • Save
  • Share
  • …
 
<!DOCTYPE html>
<html lang="en">
​
<head>
    <meta charset="UTF-8">
    <title>snake</title>
    <style type="text/css">
    ul {
        list-style: none;
        margin: 0;
        padding: 0;
        height: 25px;
    }
    
    li {
        width: 20px;
        height: 20px;
        float: left;
        border: 1px solid #ccc;
        margin: 1px;
    }
    
    li.on {
        background-color: red;
    }
    
    li.head {
        border: 1px dashed #FF7F00;
    }
    </style>
</head>
​
<body>
    <script type="text/javascript">
    function Snake(width, height) {
        this.width = width;
        this.height = height;
        this.body = [];
        this.orient = 1;
        this.container = null;
        this.timer = null;
        this.speed = 300;
        this.list = null;
        this.count = width * height;
    }
​
    Snake.prototype = {
        constructor: Snake,
        init: function() {
            var div = this.container = document.createElement('div');
            ul = document.createElement('ul'),
                li = document.createElement('li'),
                rows = this.width,
                cols = this.height;
​
            while (rows-- > 0) {
                ul.appendChild(li.cloneNode());
            }
​
            while (cols-- > 0) {
                div.appendChild(ul.cloneNode(true));
            }
​
            document.getElementsByTagName('body')[0].appendChild(div);
​
            this.list = document.getElementsByTagName('li');
​
            [].forEach.call(this.list, function(item, i) {
                item.id = 'li_' + (i + 1);
            });
​
            this.body.push(this.random());
            return this;
        },
        random: function() {
​
            if (this.count == this.body.length) {
                return null;
            }
​
            var num, item;
​
            do {
                num = Math.floor((this.count - 1) * Math.random()) + 1;
                item = document.getElementById('li_' + num);
            } while (this.body.indexOf(item) > -1);
​
            this.chioce(item);
            return item;
        },
        getEle: function(item) {
            var num = item.id.split('_').pop() - 0;
​
            switch (this.orient) {
                case 1:
                    num--;
                    num = num % this.width == 0 ? num + this.width : num;
                    break;
                case 2:
                    num = num % this.width == 0 ? num - this.width + 1 : num + 1;
                    break;
                case 3:
                    num = num / this.width <= 1 ? this.count - this.width + num : num - this.width;
                    break;
                case 4:
                    num = num + this.width;
                    num = num > this.count ? num - this.count : num;
                    break;
            }
​
            return document.getElementById('li_' + num);
        },
        move: function() {
            var next = this.getEle(this.body[0]);
​
            if (this.body.indexOf(next) > -1) {
                alert('game over!');
                clearInterval(this.timer);
            } else {
                this.body.unshift(next);
                if (!next.className.length) {
                    this.chioce(this.body[0]);
                    this.unchioce(this.body.pop());
                } else {
                    this.random();
                }
            }
        },
        chioce: function(item) {
            item.className = 'on';
        },
        unchioce: function(item) {
            item.className = '';
        },
        start: function() {
            var that = this;
            that.random();
            that.timer = setInterval(function() {
                that.move();
            }, that.speed);
​
            return this;
        }
    }
​
    window.onload = function() {
        var snake = new Snake(10, 10).init().start();
​
        document.onkeydown = function(e) {
            var num = e.which;
            if (num <= 40 && num >= 37) {
                switch (num) {
                    case 37:
                        if (snake.orient != 2) {
                            snake.orient = 1;
                        }
                        break;
                    case 38:
                        if (snake.orient != 4){
                            snake.orient = 3;
                        }
                        
                        break;
                    case 39:
                        if (snake.orient != 1){
                            snake.orient = 2;
                        }
                        break;
                    case 40:
                        if (snake.orient != 3){
                            snake.orient = 4;
                        }
                        break;
                }
                e.preventDefault();
            }
        }
    }
    </script>
</body>
​
</html>
​
Output

You can jump to the latest bin by adding /latest to your URL

Dismiss x
public
Bin info
anonymouspro
0viewers