一、用到的圖片
二、代碼如下，重點是js部分
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>jQuery九宮格大轉(zhuǎn)盤抽獎</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 class="keBody"><!--效果html開始--><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, //當前轉(zhuǎn)動到哪個位置，起點位置 count:0, //總共有多少個位置 timer:0, //setTimeout的ID，用clearTimeout清除 speed:20, //初始轉(zhuǎn)動速度 times:0, //轉(zhuǎn)動次數(shù) cycle:50, //轉(zhuǎn)動基本次數(shù)：即至少需要轉(zhuǎn)動多少次再進入抽獎環(huán)節(jié) prize:-1, //中獎位置 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();//轉(zhuǎn)動過程調(diào)用的是lottery的roll方法，這里是第一次調(diào)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);//循環(huán)調(diào)用 } return false;}var click=false;window.onload=function(){ lottery.init('lottery'); $("#lottery a").click(function(){ if (click) {//click控制一次抽獎過程中不能重復(fù)點擊抽獎按鈕，后面的點擊不響應(yīng) return false; }else{ lottery.speed=100; roll(); //轉(zhuǎn)圈過程不響應(yīng)click事件，會將click置為false click=true; //一次抽獎完成后，設(shè)置click為true，可繼續(xù)抽獎 return false; } });};</script><!--效果html結(jié)束--></body></html>效果如下：
三、注意事項
1、抽獎過程說明
上面只是前端展示的效果。中獎物品通過一個隨機數(shù)生成。
var index = Math.random()*(lottery.count)|0;
真正開發(fā)中中獎物品是通過向后端接口發(fā)送請求返回的。
$("#lottery a").click(function(){ var islogin=checkLogin(); if(islogin){//已登錄用戶才能去抽獎 if (click) { return false; }else{ //向后端接口發(fā)請求返回中獎結(jié)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手機"; $("#content1").html(content); }else if(rewardid=="PPTVKING"){ lottery.prize=1; prize=1; content="一部PPTV KING7s 3D影音手機"; $("#content1").html(content); /*... */ }else if(rewardid=="legao"){ lottery.prize=5; prize=5; content="一份樂高的玩具"; $("#content1").html(content); } lottery.speed=100; roll(); click=true; return false; }else{ /*錯誤處理*/ if(data.errorcode==3){ $("#novip").show(); }else{ $("#notime").show(); } } }/*function結(jié)束*/ });/*ajax結(jié)束*/ }/*else結(jié)束*/ }});2、兼容性說明
.mask開始如下，用的是rgba，但是IE8不兼容，改為使用png圖片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}以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持武林網(wǎng)。
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