原生js贪吃蛇
学JS不久，写一个简单的贪吃蛇练练手，各位大神轻点拍演示地址：http://www.osctools.net/jsbin/fbzvslwe/1
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>JS贪吃蛇</title><style>.box {position:absolute;background:#C4E7FB;border:1px solid #C4E7FB;}.snake {position:absolute;background:green;border:1px solid white;}.food {position:absolute;background:yellow;border:1px solid white;}#test {position:relative;}</style></head><body><h1>JS贪吃蛇</h1>地图行数：<input type="text" name="row" value="15" />地图列数：<input type="text" name="col" value="30" />难度：<select name="hard" onchange="speed = parseInt(this.value);"><option value="1000">简单</option><option value="800">中等</option><option value="500">困难</option></select><input type="button" value="开始"/>&nbsp;&nbsp;<input type="button" value="暂停"/>&nbsp;&nbsp;<input type="button" value="重新开始"/>&nbsp;&nbsp;<span>您的分数：</span> <span id="score" style="color:red;">0</span> <span>分</span><div id="test"></div><script>var snake=new Array();//那条蛇var rows//行数var cols//列数var boxwidth=25;//一个div的宽度var boxheight=25;//一个div的高度var map=new Array();//地图数组:var prevdirection;//蛇上一步的前进方向var direction=0;//蛇的前进方向var speed=parseInt(document.getElementsByName('hard').value);//初始速度var score=document.getElementById('score');var dt;//定时器var snakehead;var snakepointx=0;var snakepointy=0;var foodpointx=0;var foodpointy=0;var state=0;//状态码function getbox(){//生成地图、蛇头、食物map=1;//1代表蛇头map=2;//2代表食物for(var i=0; i<rows; i++){//生成地图for(var j=0; j<cols; j++){var div=document.createElement('div');if(map == 1){snake=i*cols+j;//将蛇头的位置写入蛇数组第一个元素div.className="snake";}else if(map == 2){div.className="food";}else{div.className="box";}div.id=i*cols+j;div.style.width=boxwidth;div.style.height=boxheight;div.style.top=50+boxheight*i;div.style.left=50+boxwidth*j;document.getElementById('test').appendChild(div);}}}window.document.onkeydown=function(e){//获取键盘码var ev=e || window.event;prevdirection=direction;direction = ev.keyCode;if(direction > 40 || direction < 37){direction = prevdirection;}if(prevdirection == 37 && direction == 39){//如果方向是左，则向右无效direction = 37;}if(prevdirection == 38 && direction == 40){//如果方向是上，则向下无效direction = 38;}if(prevdirection == 39 && direction == 37){//如果方向是右，则向左无效direction = 39;}if(prevdirection == 40 && direction == 38){//如果方向是下，则向上无效direction = 40;}}function inarr(num, arr){//判断一个元素是否在数组中for(var i=0, j=arr.length; i<j; i++){if(num == arr){return true;}}return false;}function move(){var head = document.getElementById(snake);//蛇头位置var prevpoint = snake;//保存上一点坐标var snakehead=snake;//下一点的位置switch(direction){//根据方向，设置下一步蛇头的位置case 37:snakehead=snake-1;break;case 38:snakehead=snake-cols;break;case 39:snakehead=snake+1;break;case 40:snakehead=snake+cols;}if((snakehead < 0 || snakehead > rows*cols) || (prevpoint - snakehead == 1 && prevpoint % cols == 0) || (snakehead - prevpoint == 1 && snakehead % cols == 0) || (prevpoint != snakehead && inarr(snakehead, snake))){//游戏结束的条件clearInterval(dt);alert('游戏结束！您的得分是：'+score.innerHTML);return false;}if(snakehead == foodpointx*cols+foodpointy){//吃到食物了，增加蛇的长度并重新生成食物snake=snake;speed = speed-snake.length*5 < 100 ? 100 : speed-snake.length*5 ;//速度score.innerHTML = Math.round(snake.length*10+snake.length/speed*1000);//积分clearInterval(dt);dt=setInterval(move,speed);var prevfoodx=foodpointx;//保存上一点的食物坐标，确保下一点生成的坐标不在原点上var prevfoody=foodpointy;//保存上一点的食物坐标，确保下一点生成的坐标不在原点上while(inarr(foodpointx*cols+foodpointy, snake) || (prevfoodx == foodpointx && prevfoody == foodpointy)){//保证下一个生成的食物不在蛇身上，和不出现在和上一个相同的位置foodpointx=Math.floor(Math.random()*rows);foodpointy=Math.floor(Math.random()*cols);}document.getElementById(foodpointx*cols+foodpointy).className="food";}var endsnake=snake.pop();//最后一个元素出栈snake.unshift(snakehead);//将蛇头下一步的位置入队列for(var i=0, j=snake.length; i<j; i++){var nextdiv=document.getElementById(snake);nextdiv.className='snake';}if(endsnake != snake){document.getElementById(endsnake).className='box';}}function starts(){if(state != 0){alert('已经开始了！');return false;}state = 1;rows=parseInt(document.getElementsByName('row').value);//行数cols=parseInt(document.getElementsByName('col').value);//列数for(var i=0; i<rows; i++){//生成地图数组map=new Array();for(var j=0; j<cols; j++){map=0;}}while(snakepointx == foodpointx && snakepointy == foodpointy){//确保蛇头和食物不出现在同一点上snakepointx=Math.floor(Math.random()*rows);snakepointy=Math.floor(Math.random()*cols);foodpointx=Math.floor(Math.random()*rows);foodpointy=Math.floor(Math.random()*cols);}getbox();dt=setInterval(move,speed);}function pause(obj){if(state == 0){alert('还没开始暂停什么！');return false;}if(state == 2){state = 3;dt=setInterval(move,speed);obj.value="暂停";}else{state = 2;clearInterval(dt);obj.value="继续";}}</script></body></html>
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