参考博客:http://blog.csdn.net/sunxing007/article/details/4187038
上面的博客是一个参考,竟第一次做。真让自己盲人摸象做不出来。
只是我在其上做了一些改进。界面等效果看起来更好一些。
下图是在Chrome上执行的效果,可是火狐和IE会不兼容。onkeydown事件不能正确调用
这里用了一张图把贪吃蛇制作过程的思想画了出来,画的有点简陋:
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以下就是把代码发上来。上边有具体的解释:
<html> <head> <title>贪吃蛇 By Big_Adamapple</title> <style> body{ margin-left:auto; margin-right:auto; font-size:9px; background:#333333; } table{margin:140px auto 10px auto; overflow:hidden; border-collapse:collapse; } td {width:20px; height:20px; border:1px solid #eee; background:#f4f4f4} input{width:80px; height:30px; margin-left:10px;} #operate{margin-left:650px; font-size:20px;} #speed,#core{height:30px; width:50px; text-align:center; color:red; font-size:20px;} #operate span{color:white;} </style> </head> <script> function $(id){return document.getElementById(id);} //贪吃蛇类 var Snake = { tbl: null, /** * body: 蛇身。数组放蛇的每一节, * 数据结构{x:x0, y:y0, color:color0}, * x,y表示坐标,color表示颜色 **/ body: [], //当前移动的方向,取值0,1,2,3, 分别表示向上,右,下,左, 按键盘方向键能够改变它 direction: 0, //定时器 timer: null, //速度 speed: 250, //是否已经暂停 paused: true, //行数 rowCount: 20, //列数 colCount: 20, //分数 core: 0, //初始化 init: function(){ this.tbl = $("main"); var x = 0; var y = 0; this.direction = Math.floor(Math.random()*4); //产生随机移动方向 //产生table for(var row=0;row<this.rowCount;row++){ var tr=this.tbl.insertRow(-1); for(var col=0;col<this.colCount;col++) { var td=tr.insertCell(-1); } } //初始化产生食物 for(var i=0; i<1; i++){ x = Math.floor(Math.random()*this.colCount); y = Math.floor(Math.random()*this.rowCount); if(!this.isCellFilled(x,y)){ this.tbl.rows[y].cells[x].style.backgroundColor = '#009933'; } } //产生蛇头 while(true){ x = Math.floor(Math.random()*this.colCount); y = Math.floor(Math.random()*this.rowCount); if(!this.isCellFilled(x,y)){ this.tbl.rows[y].cells[x].style.backgroundColor = "#3399CC"; this.body.push({x:x,y:y,color:'black'}); break; } } this.paused = true; //设置開始 //加入键盘事件 document.onkeydown= function(e){ if (!e) e = e || window.event; switch(e.which){ case 13: { if(Snake.paused){ Snake.move(); Snake.paused = false; } else{ //假设没有暂停,则停止移动 Snake.pause(); Snake.paused = true; } break; } case 37:{//left //阻止蛇倒退走 if(Snake.direction==1){ break; } Snake.direction = 3; break; } case 38:{//up //快捷键在这里起作用 if(event.ctrlKey){ Snake.speedUp(-20); break; } if(Snake.direction==2){//阻止蛇倒退走 break; } Snake.direction = 0; break; } case 39:{//right if(Snake.direction==3){//阻止蛇倒退走 break; } Snake.direction = 1; break; } case 40:{//down if(event.ctrlKey){ Snake.speedUp(20); break; } if(Snake.direction==0){//阻止蛇倒退走 break; } Snake.direction = 2; break; } } } }, //移动 move: function(){ $("btn").value="暂停"; this.timer = setInterval(function(){ Snake.erase(); Snake.moveOneStep(); Snake.paint(); $("core").value = Snake.core; $("speed").value = Snake.speedClass(); }, this.speed); }, //移动一节身体 moveOneStep: function(){ if(this.checkNextStep()==-1){ clearInterval(this.timer); alert("Game Over"); return; } if(this.checkNextStep()==1){ var _point = this.getNextPos(); var _x = _point.x; var _y = _point.y; var _color = 'red'; Snake.core += 10; this.body.unshift({x:_x,y:_y,color:_color}); this.generateDood(); //由于吃了一个食物。所以再产生一个食物 return; } var point = this.getNextPos(); var color = '#3399CC'; //蛇尾减一节。 蛇头加一节,呈现蛇前进的效果 this.body.pop(); this.body.unshift({x:point.x,y:point.y,color:color}); }, pause: function(){ $("btn").value="開始"; clearInterval(Snake.timer); this.paint(); }, //探寻下一步将走到什么地方 getNextPos: function(){ var x = this.body[0].x; var y = this.body[0].y; //向上 if(this.direction==0){ y--; } //向右 else if(this.direction==1){ x++; } //向下 else if(this.direction==2){ y++; } //向左 else{ x--; } //返回一个坐标 return {x:x,y:y}; }, //检查将要移动到的下一步是什么 checkNextStep: function(){ var point = this.getNextPos(); var x = point.x; var y = point.y; if(x<0 || x>=this.colCount || y<0 || y>=this.rowCount){ return -1;//触边界,游戏结束 } for(var i=0; i<this.body.length; i++){ if(this.body[i].x==x && this.body[i].y==y){ return -1;//碰到自己的身体,游戏结束 } } if(this.isCellFilled(x,y)){ return 1;//有东西 } return 0;//空地 }, //擦除蛇身 erase: function(){ for(var i=0; i<this.body.length; i++){ this.eraseDot(this.body[i].x, this.body[i].y); } }, //绘制蛇身 paint: function(){ for(var i=0; i<this.body.length; i++){ this.paintDot(this.body[i].x, this.body[i].y,'#3399CC'); } }, //擦除一节 eraseDot: function(x,y){ this.tbl.rows[y].cells[x].style.backgroundColor = ""; }, paintDot: function(x,y,color){ this.tbl.rows[y].cells[x].style.backgroundColor = color; }, //检查一个坐标点有没有被填充 isCellFilled: function(x,y){ if(this.tbl.rows[y].cells[x].style.backgroundColor == ""){ return false; } return true; }, //又一次開始 restart: function(){ if(this.timer){ clearInterval(this.timer); } for(var i=0; i<this.rowCount;i++){ this.tbl.deleteRow(0); } this.body = []; this.init(); this.speed = 250; }, //加速 speedUp: function(time){ if(!this.paused){ if(this.speed+time<10||this.speed+time>2000){ return; } this.speed +=time; this.pause(); this.move(); } }, speedClass:function(){ var speedClass = (250-Snake.speed)/20; return speedClass; }, //产生食物。 generateDood: function(){ var x = Math.floor(Math.random()*this.colCount); var y = Math.floor(Math.random()*this.rowCount); var color = '#009933'; while (true) { if (!this.isCellFilled(x, y)) { this.tbl.rows[y].cells[x].style.backgroundColor = color; break; } x = Math.floor(Math.random()*this.colCount); y = Math.floor(Math.random()*this.rowCount); } } }; </script> <body onLoad="Snake.init();"> <div id="pannel"> <table id="main" border="1" cellspacing="0" cellpadding="0"> </table> <div id="operate"> <input type="button" id="btn" value="開始" /> <input type="button" id="reset" value="又一次開始" /> <input type="button" id="upSpeed" value="加速" /> <input type="button" id="downSpeed" value="减速" /><br><br> <span>当前分数:<input type="text" id="core" value=0 readonly="readonly" /></span> <span>当前速度<input type="text" id="speed" value=0 readonly="readonly" /></span> <div> </div> <script> $('btn').onclick = function(){ if(Snake.paused){ Snake.move(); Snake.paused = false; } else{ Snake.pause(); Snake.paused = true; } }; $("reset").onclick = function(){ Snake.restart(); this.blur(); }; $("upSpeed").onclick = function(){ Snake.speedUp(-20); }; $("downSpeed").onclick = function(){ Snake.speedUp(20); }; </script> </body> </html>
代码可能有点多,并且bug也有好几个。可是对于刚開始学习的人我感觉应该是挺easy理解的。
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时间: 2024-10-13 13:25:54