javascript贪吃蛇完整版(源码)_javascript技巧-tutorial js-php.cn

javascript贪吃蛇完整版注释完整，面向对象

贪吃蛇 Snake v2.4

<script> function $(id){return document.getElementById(id);} /************************************************************** * javascript贪吃蛇 v2.4 * v2.4修正了蛇身颜色可以随着蛇前进而移动 **************************************************************/ //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, 按键盘方向键可以改变它 direction: 0, //定时器 timer: null, //速度 speed: 250, //是否已经暂停 paused: true, //行数 rowCount: 30, //列数 colCount: 30, //初始化 init: function(){ var colors = ['red','orange','yellow','green','blue','purple','#ccc']; this.tbl = $("main"); var x = 0; var y = 0; var colorIndex = 0; //产生初始移动方向 this.direction = Math.floor(Math.random()*4); //构造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); } } //产生20个松散节点 for(var i=0; i<10; i++){ x = Math.floor(Math.random()*this.colCount); y = Math.floor(Math.random()*this.rowCount); colorIndex = Math.floor(Math.random()*7); if(!this.isCellFilled(x,y)){ this.tbl.rows[y].cells[x].style.backgroundColor = colors[colorIndex]; } } //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 = "black"; this.body.push({x:x,y:y,color:'black'}); break; } } this.paused = true; //添加键盘事件 document.onkeydown= function(e){ if (!e)e=window.event; switch(e.keyCode | e.which | e.charCode){ case 13: { if(Snake.paused){ Snake.move(); Snake.paused = false; } else{ //如果没有暂停，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(){ this.timer = setInterval(function(){ Snake.erase(); Snake.moveOneStep(); Snake.paint(); }, this.speed); }, //移动一节身体 moveOneStep: function(){ if(this.checkNextStep()==-1){ clearInterval(this.timer); alert("Game over!/nPress Restart to continue."); return; } if(this.checkNextStep()==1){ var _point = this.getNextPos(); var _x = _point.x; var _y = _point.y; var _color = this.getColor(_x,_y); this.body.unshift({x:_x,y:_y,color:_color}); //因为吃了一个食物，所以再产生一个食物 this.generateDood(); return; } //window.status = this.toString(); var point = this.getNextPos(); //保留第一节的颜色 var color = this.body[0].color; //颜色向前移动 for(var i=0; i<this.body.length-1; i++){ this.body[i].color = this.body[i+1].color; } //蛇尾减一节，蛇尾加一节，呈现蛇前进的效果 this.body.pop(); this.body.unshift({x:point.x,y:point.y,color:color}); //window.status = this.toString(); }, //探寻下一步将走到什么地方 pause: function(){ clearInterval(Snake.timer); this.paint(); }, getNextPos: function(){ var x = this.body[0].x; var y = this.body[0].y; var color = this.body[0].color; //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,this.body[i].color); } }, //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; }, //得到一个坐标上的颜色 getColor: function(x,y){ return this.tbl.rows[y].cells[x].style.backgroundColor; }, //用于调试 toString: function(){ var str = ""; for(var i=0; i<this.body.length; i++){ str += "x:" + this.body[i].x + " y:" + this.body[i].y + " color:" + this.body[i].color + " - "; } return str; }, //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; }, //重新开始 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(); } }, //产生食物。 generateDood: function(){ var colors = ['red','orange','yellow','green','blue','purple','#ccc']; var x = Math.floor(Math.random()*this.colCount); var y = Math.floor(Math.random()*this.rowCount); var colorIndex = Math.floor(Math.random()*7); if(!this.isCellFilled(x,y)){ this.tbl.rows[y].cells[x].style.backgroundColor = colors[colorIndex]; } } }; </script>

/*************************************************************

* javascript贪吃蛇 v2.4

**************************************************************/

点左边按钮或按Enter开始/暂停游戏

点左边按钮或按Ctrl + ↑加速

点左边按钮或按Ctrl + ↓减速
<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>