有意思的代码：控制台输出贪吃蛇游戏

/* F12贪吃蛇小游戏
 */
(function () {
    function play(simsun,speed){
        var maxLog = 200;//maxLog个就清除一次，以免浏览器卡死
        var logNum = 0;
        var speed = speed?speed:3;
        if(simsun===false){
            var cubeletter = '回';
        }else{
            cubeletter = '〓';
        }
        var time = 1000/speed;
        var width=32,height=24;//内部
        var size = width*height;
        var applePoint = {
            x:null,
            y:null,
            set:function(){
                do{
                    var x = parseInt(Math.random()*width);
                    var y = parseInt(Math.random()*width);
                }while(checkBound(x,y));
                this.x = x;
                this.y = y;
            }
        }
        var snake = [];
        snake.push({
            x:parseInt(width/2),
            y:parseInt(height/2)
        });
        var direction = 'top';
        function snakeGo(){
            var head = snake[0];
            var newHead = {
                x:head.x,
                y:head.y
            };
            if(direction=='top'){
                newHead.y--;
            }else if(direction=='left'){
                newHead.x--;
            }else if(direction=='right'){
                newHead.x++;
            }else{
                newHead.y++;

            }
            if(!checkBound(newHead.x,newHead.y)){
                snake.unshift(newHead);
                if(newHead.x==applePoint.x&&newHead.y==applePoint.y){
                    applePoint.set();
                }else{
                    snake.pop();
                }
                paint();
                setTimeout(snakeGo,time);
            }else{
                console.log('%cgame over,吃了'+(snake.length-1)+'个苹果。','color:red;font-weight:bold;');
                window.removeEventListener('keydown',keyDown,false);
            }
        }
        function checkBound(x,y){
            if(x<0||x>=width||y<0||y>=height){
                return true;
            }
            for(var i=0;i<snake.length;i++){
                if(snake[i].x==x&&snake[i].y==y){
                    return true;
                }
            }
            return false;
        }
        function paint(){
            str = '\n';
            for(var i=0;i<height+2;i++){
                for(var j=0;j<width+2;j++){
                    var x = j-1;
                    var y = i-1;
                    if(x==applePoint.x&&y==applePoint.y){
                        str = str+'果';
                    }else if(checkBound(x,y)){
                        str = str+cubeletter;
                    }else{
                        str = str+ '　';
                    }
                }
                str = str +'\n';
            }
            logNum++;
            if(logNum%maxLog==0){
                console.clear();
            }
            console.log(str);

        }
        var readyTime = 5;
        (function(){
            console.log(readyTime+'秒...');
            if(readyTime){
                readyTime--;
                setTimeout(arguments.callee,1000);
            }else{
                applePoint.set();
                snakeGo();
            }
        })();
        var keyMap = {
            38:'top',
            39:'right',
            40:'bottom',
            37:'left'
        }
        function keyDown(e){
            e.preventDefault();
            var dir = keyMap[e.keyCode];
            if(snake.length>1&&(dir=='top'&&(snake[0].y-snake[1].y==1)||
                    dir=='left'&&(snake[0].x-snake[1].x==1)||
                    dir=='right'&&(snake[0].x-snake[1].x==-1)||
                    dir=='bottom'&&(snake[0].y-snake[1].y==-1))){
                return;
            }else{
                direction = dir;
            }
        }
        window.addEventListener('keydown',keyDown,false);
    }
    window.console = window.console||{};
    window.console.log = window.console.log||function(){};
    console.log('玩一个游戏吧。\n先把控制台拉高点.\n接着输入play，按回车，\n%c然后用鼠标点击页面，让鼠标焦点移动到页面中。\n马上转移到键盘上用上下左右操作，别动鼠标！','color:red;font-weight:bold;');

    Object.defineProperty(window, 'play', {
        get: function() {
            play()
        }
    })
})()