下面我们来分享一个九宫格抽奖特效
特效说明：
一款jQuery九宫格大转盘抽奖代码网页特效，点击抽奖按钮开始随机抽奖选择奖品，可设置起点位置、奖品数量、转动次数、中奖位置参数。（兼容测试：IE7及以上、Firefox、Chrome、Opera、Safari、360等主流浏览器）
HTML:
<> <div id="lottery"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><img src="images/1.png"></td> <td><img src="images/2.png"></td> <td><img src="images/4.png"></td> <td><img src="images/3.png"></td> </tr> <tr> <td><img src="images/7.png"></td> <td colspan="2" rowspan="2"><a href="#"></a></td> <td><img src="images/5.png"></td> </tr> <tr> <td><img src="images/1.png"></td> <td><img src="images/6.png"></td> </tr> <tr> <td><img src="images/3.png"></td> <td><img src="images/6.png"></td> <td><img src="images/8.png"></td> <td><img src="images/7.png"></td> </tr> </table> </div>
js部分
<script type="text/javascript" src="jquery-1.8.3.min.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(); 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); } return false; } var click=false; window.onload=function(){ lottery.init('lottery'); $("#lottery a").click(function(){ if (click) { return false; }else{ lottery.speed=100; roll(); click=true; return false; } }); }; </script>
CSS部分
/* 效果CSS开始 */ #lottery{width:574px;height:584px;margin:0px auto;background:url(../images/bg.jpg) no-repeat;padding:50px 55px;} #lottery table td{width:142px;height:142px;text-align:center;vertical-align:middle;font-size:24px;color:#333;font-index:-999} #lottery table td a{width:284px;height:284px;line-height:150px;display:block;text-decoration:none;} #lottery table td.active{background-color:#ea0000;} /* 效果CSS结束 */
JS中可设置参数：
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
最后奉上演示图
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