這篇文章主要是對javascript貪吃蛇完整版(源碼)進行了詳細的分析介紹，需要的朋友可以過來參考下，希望對大家有所幫助
javascript貪吃蛇完整版 注釋完整，面向對象 代碼如下: <html> <head> <title>貪吃蛇 Snake v2.4</title> <style> body{ font-size:9pt; } table{ border-collapse: collapse; border:solid #333 1px; } td{ height: 10px; width: 10px; font-size: 0px; } .filled{ background-color:blue; } </style> </head> <script> function $(id){return document.getElementById(id);} /************************************************************** * javascript貪吃蛇 v2.4 <br /> * v2.4修正了蛇身顏色可以隨著蛇前進而移動 **************************************************************/ //貪吃蛇類 var Snake = { tbl: null, /** * body: 蛇身，數組放蛇的每一節， * 數據結構{x:x0, y:y0, color:color0}, * x,y表示坐標,color表示顏色 **/ body: [], //當前移動的方向,取值0,1,2,3, 分別表示向上,右,下,左, 按鍵盤方向鍵可以改變它 direction: 0, //定時器 timer: null, //速度 speed: 250, //是否已經暫停 paused: true, //行數 rowCount: 30, //列數 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; //產生初始移動方向 this.direction = Math.floor(Math.random()*4); //構造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); } } //產生20個松散節點 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]; } } //產生蛇頭 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; //添加鍵盤事件 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{ //如果沒有暫停，則停止移動 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 //快捷鍵在這裡起作用 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; } } } }, //移動 move: function(){ this.timer = setInterval(function(){ Snake.erase(); Snake.moveOneStep(); Snake.paint(); }, this.speed); }, //移動一節身體 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}); //因為吃了一個食物，所以再產生一個食物 this.generateDood(); return; } //window.status = this.toString(); var point = this.getNextPos(); //保留第一節的顏色 var color = this.body[0].color; //顏色向前移動 for(var i=0; i<this.body.length-1; i++){ this.body[i].color = this.body[i+1].color; } //蛇尾減一節， 蛇尾加一節，呈現蛇前進的效果 this.body.pop(); this.body.unshift({x:point.x,y:point.y,color:color}); //window.status = this.toString(); }, //探尋下一步將走到什麼地方 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--; } //返回一個坐標 return {x:x,y:y}; }, //檢查將要移動到的下一步是什麼 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;//觸邊界，游戲結束 } for(var i=0; i<this.body.length; i++){ if(this.body[i].x==x&&this.body[i].y==y){ return -1;//碰到自己的身體,游戲結束 } } if(this.isCellFilled(x,y)){ return 1;//有東西 } 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); } }, //繪制蛇身 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); } }, //擦除一節 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; }, //得到一個坐標上的顏色 getColor: function(x,y){ return this.tbl.rows[y].cells[x].style.backgroundColor; }, //用於調試 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; }, //檢查一個坐標點有沒有被填充 isCellFilled: function(x,y){ if(this.tbl.rows[y].cells[x].style.backgroundColor == ""){ return false; } return true; }, //重新開始 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(); } }, //產生食物。 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> <body onload="Snake.init();"> /*************************************************************<br /> * javascript貪吃蛇 v2.4<br /> **************************************************************/<br /> <table id="main" border="1" cellspacing="0" cellpadding="0"></table> <input type="button" id="btn" value="開始/暫停" />點左邊按鈕或按Enter開始/暫停游戲<br /> <input type="button" id="reset" value="重新開始" /><br /> <input type="button" id="upSpeed" value="加速" />點左邊按鈕或按Ctrl + ↑加速<br /> <input type="button" id="downSpeed" value="減速" />點左邊按鈕或按Ctrl + ↓減速 <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> </body> </html>