javascript 貪吃蛇(詳細注釋版)

2019-11-21 01:22:10

字體：大中小

供稿：網(wǎng)友

<html> <head>     <title>貪吃蛇 Snake v1.0</title> <style>     body{              }     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 v1.0     * author: sunxing007     * 05/14/2009     * 轉(zhuǎn)載請保留 author: sunxing007 謝謝     **/     //貪吃蛇類     var Snake = {         tbl: null,         /**         * body: 蛇身，數(shù)組放蛇的每一節(jié)，         * 數(shù)據(jù)結(jié)構(gòu){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: 200,         //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(chǎn)生初始移動方向             this.direction = Math.floor(Math.random()*4);                          //產(chǎn)生20個松散節(jié)點             for(var i=0; i<20; i++){                 x = Math.floor(Math.random()*50);                 y = Math.floor(Math.random()*50);                 colorIndex = Math.floor(Math.random()*7);                 if(!this.isCellFilled(x,y)){                     this.tbl.rows[y].cells[x].style.backgroundColor = colors[colorIndex];                 }             }             //產(chǎn)生蛇頭             while(true){                 x = Math.floor(Math.random()*50);                 y = Math.floor(Math.random()*50);                 if(!this.isCellFilled(x,y)){                     this.tbl.rows[y].cells[x].style.backgroundColor = "black";                     this.body.push({x:x,y:y,color:'black'});                     break;                 }             }             //alert(this.body[0].x);             //添加鍵盤事件             document.onkeydown= function(){                 var code = event.keyCode;                 switch(code){                     case 37:{//left                         //阻止蛇倒退走                         if(Snake.direction==1){                             break;                         }                         Snake.direction = 3;                         break;                     }                     case 38:{//up                         if(Snake.direction==2){                             break;                         }                         Snake.direction = 0;                         break;                     }                     case 39:{//right                         if(Snake.direction==3){                             break;                         }                         Snake.direction = 1;                         break;                     }                     case 40:{//down                         if(Snake.direction==0){                             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(jié)身體         moveOneStep: function(){             if(this.checkNextStep()==-1){                 clearInterval(this.timer);                 alert("Game over!/nPress F5 to Restart.");                 /**                 $('btn').disabled = false;                 $('btn').onclick = function(){                     Snake.restart();                 };                 **/                 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});                 return;             }             //window.status = this.toString();             var point = this.getNextPos();             var color = this.body[0].color;             this.body.pop();             this.body.unshift({x:point.x,y:point.y,color:color});             //調(diào)試             //window.status = this.toString();         },         //探尋下一步將走到什么地方         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么         checkNextStep: function(){             var point = this.getNextPos();             var x = point.x;             var y = point.y;             if(x<0||x>=50||y<0||y>=50){                 return -1;//觸邊界，游戲結(jié)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                 }             }             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(jié)         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;         },         //用于調(diào)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;         },         restart: function(){             if(this.timer){                 clearInterval(this.timer);             }             for(var i=0; i<this.tbl.rows.length;i++){                 for(var j=0; j<this.tbl.rows.length; i++){                     this.tbl.rows[i].cells[j].style.backgroundColor = "";                 }             }             this.body = [];             this.init();         }         //;     }; </script> <body onload="Snake.init();"> /******************************************* * javascript貪吃蛇 v1.0 * author: sunxing007 * 05/14/2009 * 轉(zhuǎn)載請保留 author: sunxing007 字樣,謝謝 *******************************************/ <button id="btn" onclick="Snake.move();this.disabled=true;">Begin</button> <table id="main" width="500" border="1" cellspacing="0" cellpadding="0"> <tr> <td id="my"> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> 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<td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> </table> </body> </html>

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