一、用到的素材
二、代码如下，重点是js部分
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jQuery九宫格大转盘抽奖</title> <style> #lottery{width:570px;height:510px;margin:0px auto;border:4px solid #ba1809;} #lottery table{background-color:yellow;} #lottery table td{position:relative;width:190px;height:170px;text-align:center;color:#333;font-index:-999} #lottery table td img{display:block;width:190px;height:170px;} #lottery table td a{width:190px;height:170px;display:block;text-decoration:none;background:url(images/lottery1.jpg) no-repeat top center;} #lottery table td a:hover{background-image:url(images/lottery2.jpg);} #lottery table td.active .mask{display:block;} .mask{ width:100%; height:100%; position:absolute; left:0; top:0; background:url(images/mask.png) no-repeat; display:none; } </style> </head> <body> <> <div id="lottery"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><img src="images/gift0.jpg"><div></div></td> <td><img src="images/gift1.jpg"><div></div></td> <td><img src="images/gift2.jpg"><div></div></td> </tr> <tr> <td><img src="images/gift7.jpg"><div></div></td> <td><a href="#"></a></td> <td><img src="images/gift3.jpg"><div></div></td> </tr> <tr> <td><img src="images/gift6.jpg"><div></div></td> <td><img src="images/gift5.jpg"><div></div></td> <td><img src="images/gift4.jpg"><div></div></td> </tr> </table> </div> <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> var lottery={ index:-1, //当前转动到哪个位置，起点位置 count:0, //总共有多少个位置 timer:0, //setTimeout的ID，用clearTimeout清除 speed:20, //初始转动速度 times:0, //转动次数 cycle:50, //转动基本次数：即至少需要转动多少次再进入抽奖环节 prize:-1, //中奖位置 init:function(id){ if ($("#"+id).find(".lottery-unit").length>0) { $lottery = $("#"+id); $units = $lottery.find(".lottery-unit"); this.obj = $lottery; this.count = $units.length; $lottery.find(".lottery-unit-"+this.index).addClass("active"); }; }, roll:function(){ var index = this.index; var count = this.count; var lottery = this.obj; $(lottery).find(".lottery-unit-"+index).removeClass("active"); index += 1; if (index>count-1) { index = 0; }; $(lottery).find(".lottery-unit-"+index).addClass("active"); this.index=index; return false; }, stop:function(index){ this.prize=index; return false; } }; function roll(){ lottery.times += 1; lottery.roll();//转动过程调用的是lottery的roll方法，这里是第一次调用初始化 if (lottery.times > lottery.cycle+10 && lottery.prize==lottery.index) { clearTimeout(lottery.timer); lottery.prize=-1; lottery.times=0; click=false; }else{ if (lottery.times<lottery.cycle) { lottery.speed -= 10; }else if(lottery.times==lottery.cycle) { var index = Math.random()*(lottery.count)|0; lottery.prize = index; }else{ if (lottery.times > lottery.cycle+10 && ((lottery.prize==0 && lottery.index==7) || lottery.prize==lottery.index+1)) { lottery.speed += 110; }else{ lottery.speed += 20; } } if (lottery.speed<40) { lottery.speed=40; }; //console.log(lottery.times+'^^^^^^'+lottery.speed+'^^^^^^^'+lottery.prize); lottery.timer = setTimeout(roll,lottery.speed);//循环调用 } return false; } var click=false; window.onload=function(){ lottery.init('lottery'); $("#lottery a").click(function(){ if (click) {//click控制一次抽奖过程中不能重复点击抽奖按钮，后面的点击不响应 return false; }else{ lottery.speed=100; roll(); //转圈过程不响应click事件，会将click置为false click=true; //一次抽奖完成后，设置click为true，可继续抽奖 return false; } }); }; </script> <> </body> </html>
效果如下：
三、注意事项
.mask开始如下，用的是rgba，但是IE8不兼容，改为使用png图片background:url(images/mask.png) no-repeat;
.mask { width: 100%; height: 100%; position: absolute; left: 0; top: 0; background-color: rgba(252,211,4,0.5); display: none }
希望大家可以从小编整理的这篇文章中有所收获，对大家实现抽奖功能有所帮助。
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