听说最近HTML5很火~~!---贪吃蛇小游戏

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>贪吃蛇</title> <style type="text/css"> *{margin:0;padding: 0;font-family: "Microsoft YaHei";} #page{margin-right: auto;margin-left: auto; margin-top: 20px;height: 600px; width: 980px; } #yard{ width: 800px;border: 1px solid gray;box-shadow: 0 0 10px black; float: right;} #mark{font-weight: 800;} #mark_con{ color: red; } button{width: 50px; } a{text-decoration:none;} </style> <script type="text/javascript"> //伪常量 var BLOCK_SIZE = 20; //格子大小 var COLS = 40; //列数 var ROWS =30; //行数 //变量 var snakes = []; //保存蛇坐标 var c = null; //绘图对象 var toGo = 3; //行进方向 var snakecount = 4; //蛇身数量 var interval = null; //计时器 var foodX = 0; //食物X轴坐标 var foodY = 0; //食物Y轴坐标 var oMark = null; //分数显示框 var isPause = false; //是否暂停 // 绘图函数 function draw(){ c.clearRect(0,0,BLOCK_SIZE * COLS, BLOCK_SIZE * ROWS); //画出横线 for( var i = 1; i <= ROWS; i++ ) { c.beginPath(); c.moveTo(0, i * BLOCK_SIZE); c.lineTo(BLOCK_SIZE * COLS, i * BLOCK_SIZE); c.strokeStyle = "gray"; c.stroke(); } //画出竖线 for(var i = 1; i <= COLS; i++){ c.beginPath(); c.moveTo(i * BLOCK_SIZE, 0); c.lineTo(i * BLOCK_SIZE, BLOCK_SIZE * ROWS); c.stroke(); } //画出蛇 for (var i = 0; i < snakes.length; i++){ c.beginPath(); c.fillStyle = "green"; c.fillRect(snakes[i].x, snakes[i].y, BLOCK_SIZE, BLOCK_SIZE); c.moveTo(snakes[i].x, snakes[i].y); c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y); c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y + BLOCK_SIZE); c.lineTo(snakes[i].x, snakes[i].y + BLOCK_SIZE); c.closePath(); c.strokeStyle = "white"; c.stroke(); } //画出食物 c.beginPath(); c.fillStyle = "yellow"; c.fillRect(foodX, foodY, BLOCK_SIZE, BLOCK_SIZE); c.moveTo(foodX, foodY); c.lineTo(foodX + BLOCK_SIZE, foodY); c.lineTo(foodX + BLOCK_SIZE, foodY + BLOCK_SIZE); c.lineTo(foodX, foodY + BLOCK_SIZE); c.closePath(); c.strokeStyle = "red"; c.stroke(); } //游戏初始化 function start(){ for( var i = 0; i < snakecount; i++){ snakes[i] = {x: i * BLOCK_SIZE, y: 0}; } addFood(); draw(); oMark.innerHTML = 0; } //移动函数 function move(){ switch(toGo){ case 1: //左边 snakes.push({x: snakes[snakecount - 1].x - BLOCK_SIZE, y: snakes[snakecount - 1].y}); break; case 2: //上边 snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y - BLOCK_SIZE}); break; case 3: //右边 snakes.push({x: snakes[snakecount - 1].x + BLOCK_SIZE, y: snakes[snakecount - 1].y}); break; case 4: //下边 snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y + BLOCK_SIZE}); break; default:; } snakes.shift(); isEat(); isDie(); draw(); } //吃到食物判断 function isEat(){ if (snakes[snakecount - 1].x == foodX && snakes[snakecount - 1].y == foodY) { oMark.innerHTML = (parseInt(oMark.innerHTML) + 1).toString(); addFood(); addSnake(); } } //添加蛇身 function addSnake(){ snakecount++; snakes.unshift({x:BLOCK_SIZE * COLS, y:BLOCK_SIZE * ROWS}); } //交互响应函数 function keydown(keyCode){ switch(keyCode){ case 37: //左边 if(toGo != 1 && toGo != 3) toGo = 1;break; case 38: //上边 if(toGo != 2 && toGo != 4) toGo = 2;break; case 39: //右边 if(toGo != 3 && toGo != 1) toGo = 3;break; case 40: //下的 if(toGo != 4 && toGo != 2) toGo = 4;break; case 80: //开始/暂停 if(isPause){ interval = setInterval(move,100); isPause = false; document.getElementById('pause').innerHTML = "Pause"; }else{ clearInterval(interval); isPause = true; document.getElementById('pause').innerHTML = "Start"; } break; } } //制造食物 function addFood(){ foodX = Math.floor(Math.random() * (COLS - 1)) * BLOCK_SIZE; foodY = Math.floor(Math.random() * (ROWS - 1)) * BLOCK_SIZE; // console.log(foodX + " -- " + foodY); } //死亡判断 function isDie(){ if(snakes[snakecount - 1].x == -20 || snakes[snakecount - 1].x == BLOCK_SIZE * COLS || snakes[snakecount - 1].y == -20 || snakes[snakecount - 1].y == BLOCK_SIZE * ROWS){ alert("Game Over!"); clearInterval(interval); } for(var i = 0; i < snakecount - 1; i++){ if(snakes[snakecount - 1].x == snakes[i].x && snakes[snakecount - 1].y == snakes[i].y){ clearInterval(interval); alert("Game Over!"); } } } // 启动函数 window.onload = function(){ c = document.getElementById('canvas').getContext('2d'); oMark = document.getElementById('mark_con'); start(); interval = setInterval(move,100); document.onkeydown = function(event){ var event = event || window.event; keydown(event.keyCode); } } </script> </head> <body> <div id="page"> <div id="yard"><canvas id="canvas" height="600px" width="800px"></canvas></div> <div id="help"> <div id="mark">得分:<span id="mark_con"></span></div> <div id="helper"> <table> <tr> <td></td> <td><button onclick="keydown(38);">上</button></td> <td></td> </tr> <tr> <td><button onclick="keydown(37);">左</button></td> <td><button onclick="keydown(80);" id="pause">暂停</button></td> <td><button onclick="keydown(39);">右</button></td> </tr> <tr> <td></td> <td><button onclick="keydown(40);">下</button></td> <td></td> </tr> </table><a href="index.html">再玩一次</a> </div> </div> </div> <div style="text-align:center;"> </div> </body> </html>

原文发布于微信公众号 - 数据库SQL(SQLdba)

原文发表时间:2015-06-11

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