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web前端项目-贪吃蛇小游戏
【贪吃蛇】是一款经典的小游戏，采用HTML、CSS和JavaScript技术进行开发，玩家通过控制一条蛇在地图上移动，蛇的目的是吃掉地图上的食物，并且让自己变得更长。游戏的核心玩法是控制蛇的移动方向和长度，同时避免蛇头碰到自己的身体或者游戏边界
运行效果：上下左右键控制蛇的移动；空格为游戏开始/暂停；可以在游戏界面设置蛇的移动速度
HTML源码–index.html：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>贪吃蛇小游戏</title>
<link rel="stylesheet" href="css/snake.css">
<script type="text/javascript" src="js/snake.js"></script>
</head><body>
<div class="box"><span>分数：<span id="foodNum"></span></span><span>选择速度：<select id="setSpeed"><option value="200">慢速</option><option value="100">中速</option><option value="50">快速</option></select></span><span>开始/暂停(空格键)</span>
</div>
<table id="map"></table>
</body>
</html>
js源码–snake.js：
function Snake(){this.rows = 21;//21行this.cols = 21;//21列this.speed = 200;//前进速度this.curKey = 0;//当前方向按键键码值this.timer = 0;this.pos = [];//蛇身位置this.foodPos = {"x":-1,"y":-1};this.foodNum = 0;//吃掉食物数量this.dom = document.getElementById("map");//地图元素this.pause = 1;//1表示暂停，-1表示开始
}
Snake.prototype.map = function(){//创建地图if(this.dom.firstChild){this.dom.removeChild(this.dom.firstChild);//重新开始 删除之前创建的tbody}for( j = 0; j < this.rows; j++ ){var tr = this.dom.insertRow(-1);//插入一行for( i = 0; i < this.cols; i++ ){tr.insertCell(-1);//插入一列}}
}
Snake.prototype.food = function(){//生成食物do{this.foodPos.y = Math.floor( Math.random()*this.rows );this.foodPos.x = Math.floor( Math.random()*this.cols );}while( this.dom.rows[this.foodPos.y].cells[this.foodPos.x].className != "" )//防止食物生成在蛇身上this.dom.rows[this.foodPos.y].cells[this.foodPos.x].className="snakefood";//设置食物样式document.getElementById("foodNum").innerHTML=this.foodNum++;//设置分数
}
Snake.prototype.init = function(){this.map();//创建地图arguments[0] ? this.speed=arguments[0] : false;//选择速度this.pos = [{"x":2,"y":0},{"x":1,"y":0},{"x":0,"y":0}];//定义蛇身位置for(var j=0; j<this.pos.length; j++ ){//显示蛇身this.dom.rows[this.pos[j].y].cells[this.pos[j].x].className="snakebody";}this.dom.rows[this.pos[0].y].cells[this.pos[0].x].className="snakehead";//为蛇头设置样式this.curKey = 0;//当前方向按键键码值this.foodNum = 0;//吃掉食物数量this.food();//生成食物this.pause = 1;//1表示暂停，-1表示开始
}
Snake.prototype.trigger = function(e){var _t=this;var e = e || event;var eKey = e.keyCode;//获取按键键码值if( eKey>=37 && eKey<=40 && eKey!=this.curKey && !( (this.curKey == 37 && eKey == 39) || (this.curKey == 38 && eKey == 40) || (this.curKey == 39 && eKey == 37) || (this.curKey == 40 && eKey == 38) ) && this.pause==-1 ){//如果按下的是方向键，并且不是当前方向，也不是反方向和暂停状态this.curKey = eKey; //设置当前方向按键键码值 }else if( eKey==32 ){this.curKey = (this.curKey==0) ? 39 : this.curKey;this.pause*=-1;if(this.pause==-1){this.timer=window.setInterval(function(){_t.move()},this.speed);//蛇身移动}else{window.clearInterval(this.timer);//停止}}
}
Snake.prototype.move = function(){//移动switch(this.curKey){case 37: //左方向if( this.pos[0].x <= 0 ){ //蛇头撞到边界this.over(); return; }else{ this.pos.unshift( {"x":this.pos[0].x-1,"y":this.pos[0].y}); //添加元素}break;case 38: //上方向if( this.pos[0].y <= 0 ){ this.over(); return; }else{ this.pos.unshift( {"x":this.pos[0].x,"y":this.pos[0].y-1}); }break;case 39://右方向if( this.pos[0].x >= this.cols-1 ){ this.over(); return; }else{ this.pos.unshift( {"x":this.pos[0].x+1,"y":this.pos[0].y}); }break;case 40: //下方向if( this.pos[0].y >= this.rows-1 ){ this.over(); return; }else{ this.pos.unshift( {"x":this.pos[0].x,"y":this.pos[0].y+1}); }break;}if( this.pos[0].x == this.foodPos.x && this.pos[0].y == this.foodPos.y ){//蛇头位置与食物重叠this.food();//生成食物}else if( this.curKey != 0 ){this.dom.rows[this.pos[this.pos.length-1].y].cells[this.pos[this.pos.length-1].x].className="";this.pos.pop();//删除蛇尾}for(i=3;i<this.pos.length;i++){//从蛇身的第四节开始判断是否撞到自己if( this.pos[i].x == this.pos[0].x && this.pos[i].y == this.pos[0].y ){ this.over();//游戏结束return;}}this.dom.rows[this.pos[0].y].cells[this.pos[0].x].className="snakehead";//画新蛇头this.dom.rows[this.pos[1].y].cells[this.pos[1].x].className="snakebody";//原蛇头变为蛇身
}
Snake.prototype.over = function(){alert("游戏结束");window.clearInterval(this.timer);//停止this.init();//重置游戏
}
window.onload = function(){var snake = new Snake();//创建对象实例snake.init();//调用初始化方法document.onkeydown = function(e){ snake.trigger(e); //按下按键时调用方法}document.getElementById("setSpeed").onchange = function(){ this.blur(); snake.init(this.value); }
}
CSS源码–snake.css：
* { margin:0; padding:0; font-family:Verdana,宋体; font-size:12px;}table#map { width:auto; height:auto; margin:0 auto; border-collapse:collapse; border-spacing:0; background-color:#EAEAEA; clear:both; background:#74AFE0}td { width:10px; height:10px; border:1px solid black;}.snakehead { background-color: orangered;}.snakebody { background-color:#FFCC00;}.snakefood { background-color: orangered;}.box { width:310px; margin:0 auto; padding:3em 0; list-style:none;}.box>span{ float:left; height:30px; margin-right:1.5em; line-height:30px;}
注： 以上为本项目的所有源码，无图片素材