jquery实现九宫格抽奖的方法：1、创建好前端展示的代码；2、通过jquery代码“$(“#lottery a”).cpck(function(){…}”实现九宫格抽奖即可。
本文操作环境：windows7系统、jquery3.2.1版、DELL G3电脑
jquery怎么实现九宫格抽奖？
jquery——九宫格大转盘抽奖实例
一、用到的图片
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 sopd #ba1809;}#lottery table{background-color:yellow;}#lottery table td{position:relative;width:190px;height:170px;text-apgn: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 class=”keBody”><!–效果html开始–><div id=”lottery”> <table border=”0″ cellpadding=”0″ cellspacing=”0″> <tr> <td class=”lottery-unit lottery-unit-0″><img src=”images/gift0.jpg”><div class=”mask”></div></td> <td class=”lottery-unit lottery-unit-1″><img src=”images/gift1.jpg”><div class=”mask”></div></td> <td class=”lottery-unit lottery-unit-2″><img src=”images/gift2.jpg”><div class=”mask”></div></td> </tr> <tr> <td class=”lottery-unit lottery-unit-7″><img src=”images/gift7.jpg”><div class=”mask”></div></td> <td><a href=”#”></a></td> <td class=”lottery-unit lottery-unit-3″><img src=”images/gift3.jpg”><div class=”mask”></div></td> </tr> <tr> <td class=”lottery-unit lottery-unit-6″><img src=”images/gift6.jpg”><div class=”mask”></div></td> <td class=”lottery-unit lottery-unit-5″><img src=”images/gift5.jpg”><div class=”mask”></div></td> <td class=”lottery-unit lottery-unit-4″><img src=”images/gift4.jpg”><div class=”mask”></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; cpck=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 cpck=false;window.onload=function(){ lottery.init(‘lottery’); $(“#lottery a”).cpck(function(){ if (cpck) {//cpck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cpck事件，会将cpck置为false cpck=true; //一次抽奖完成后，设置cpck为true，可继续抽奖 return false; } });};</script><!–效果html结束–></body></html>
效果如下：
三、注意事项
1、抽奖过程说明
上面只是前端展示的效果。中奖物品通过一个随机数生成。
var index = Math.random()*(lottery.count)|0;
真正开发中中奖物品是通过向后端接口发送请求返回的。
$(“#lottery a”).cpck(function(){ var islogin=checkLogin(); if(islogin){//已登录用户才能去抽奖 if (cpck) { return false; }else{ //向后端接口发请求返回中奖结果 var geturl=”http://xxxxxx?username=”+username+”&token=”+token; $.ajax({ url:geturl, type:”GET”, dataType:”json”, async:false, success:function(data){ if(data.errorcode==0){ var rewardid=data[“message”][“rewardid”]; var cardno=data[“message”][“rewardCardNo”]; var passno=data[“message”][“rewardCardPass”]; var prize=-1; var content=””; if(rewardid==”iphone6″){ lottery.prize=0; prize=0; content=”一部iphone6手机”; $(“#content1″).html(content); }else if(rewardid==”PPTVKING”){ lottery.prize=1; prize=1; content=”一部PPTV KING7s 3D影音手机”; $(“#content1″).html(content); /*… */ }else if(rewardid==”legao”){ lottery.prize=5; prize=5; content=”一份乐高的玩具”; $(“#content1”).html(content); } lottery.speed=100; roll(); cpck=true; return false; }else{ /*错误处理*/ if(data.errorcode==3){ $(“#novip”).show(); }else{ $(“#notime”).show(); } } }/*function结束*/ });/*ajax结束*/ }/*else结束*/ }});
2、兼容性说明
.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}
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