用html写一个贪吃蛇游戏

在这里插入图片描述

<!DOCTYPE html>
<html>
<head><title>贪吃蛇</title><meta charset="UTF-8"><meta name="keywords" content="贪吃蛇"><meta name="Description" content="这是一个初学者用来学习的小游戏"><style type="text/css">*{margin:0;}.map{margin:100px auto;height:600px;width:900px;background:pink;border:10px solid #AFAEB2;border-radius:8px;}</style></head><body>
<div class="map">
<canvas id="canvas" height="600" width="900"></canvas>
</div><script type="text/javascript">//获取绘制工具/*var canvas = document.getElementById("canvas");var ctx = canvas.getContext("2d");//获取上下文ctx.moveTo(0,0);ctx.lineTo(450,450);*/var c=document.getElementById("canvas");var ctx=c.getContext("2d");/*ctx.beginPath();ctx.moveTo(0,0);ctx.lineTo(450,450);ctx.stroke();*/var snake =[];//定义一条蛇，画蛇的身体var snakeCount = 6;//初始化蛇的长度var foodx =0;var foody =0;var togo =0;function drawtable()//画地图的函数{for(var i=0;i<60;i++)//画竖线{ctx.strokeStyle="black";ctx.beginPath();ctx.moveTo(15*i,0);ctx.lineTo(15*i,600);ctx.closePath();ctx.stroke();}for(var j=0;j<40;j++)//画横线{ctx.strokeStyle="black";ctx.beginPath();ctx.moveTo(0,15*j);ctx.lineTo(900,15*j);ctx.closePath();ctx.stroke();}for(var k=0;k<snakeCount;k++)//画蛇的身体{ctx.fillStyle="#000";if (k==snakeCount-1){ctx.fillStyle="red";//蛇头的颜色与身体区分开}ctx.fillRect(snake[k].x,snake[k].y,15,15);//前两个数是矩形的起始坐标，后两个数是矩形的长宽。}//绘制食物	ctx.fillStyle ="black";ctx.fillRect(foodx,foody,15,15);ctx.fill();}function start()//定义蛇的坐标{//var snake =[];//定义一条蛇，画蛇的身体//var snakeCount = 6;//初始化蛇的长度for(var k=0;k<snakeCount;k++){snake[k]={x:k*15,y:0};}drawtable();addfood();//在start中调用添加食物函数}function addfood(){foodx = Math.floor(Math.random()*60)*15; //随机产生一个0-1之间的数foody = Math.floor(Math.random()*40)*15;for (var k=0;k<snake;k++){if (foodx==snake[k].x&&foody==sanke[k].y)//防止产生的随机食物落在蛇身上{	addfood();}}}	function move(){switch (togo){case 1: snake.push({x:snake[snakeCount-1].x-15,y:snake[snakeCount-1].y}); break;//向左走case 2: snake.push({x:snake[snakeCount-1].x,y:snake[snakeCount-1].y-15}); break;case 3: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y}); break;case 4: snake.push({x:snake[snakeCount-1].x,y:snake[snakeCount-1].y+15}); break;case 5: snake.push({x:snake[snakeCount-1].x-15,y:snake[snakeCount-1].y-15}); break;case 6: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y+15}); break;default: snake.push({x:snake[snakeCount-1].x+15,y:snake[snakeCount-1].y});}snake.shift();//删除数组第一个元素ctx.clearRect(0,0,900,600);//清除画布重新绘制isEat();isDead();drawtable();} 			function keydown(e){switch(e.keyCode){case 37: togo=1; break;case 38: togo=2; break;case 39: togo=3; break;case 40: togo=4; break;case 65: togo=5; break;case 68: togo=6; break;}}function isEat()//吃到食物后长度加1{if(snake[snakeCount-1].x==foodx&&snake[snakeCount-1].y==foody){addfood();snakeCount++;snake.unshift({x:-15,y:-15});}}function isDead(){if (snake[snakeCount-1].x>885||snake[snakeCount-1].y>585||snake[snakeCount-1].x<0||snake[snakeCount-1].y<0){alert("You are dead,GAME OVER!!!");window.location.reload();}}document.onkeydown=function(e)
{keydown(e);} 
window.onload = function()//调用函数
{ start();setInterval(move,150);drawtable();}
</script>
</body>
</html>