jquery——九宮格大轉盤抽獎

時間 2019-12-01

原文原文鏈接

1、用到的圖片

2、代碼以下，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,    //當前轉動到哪一個位置，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,    //初始轉動速度
    times:0,    //轉動次數
    cycle:50,    //轉動基本次數：即至少須要轉動多少次再進入抽獎環節
    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();//轉動過程調用的是lottery的roll方法，這裏是第一次調用初始化
    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);//循環調用
    }
    return false;
}

var click=false;

window.onload=function(){
    lottery.init('lottery');
    $("#lottery a").click(function(){
        if (click) {//click控制一次抽獎過程當中不能重複點擊抽獎按鈕，後面的點擊不響應
            return false;
        }else{
            lottery.speed=100;
            roll();    //轉圈過程不響應click事件，會將click置爲false
            click=true; //一次抽獎完成後，設置click爲true，可繼續抽獎
            return false;
        }
    });
};
</script>
<!--效果html結束-->

</body>
</html>

效果以下：

3、注意事項

一、抽獎過程說明

上面只是前端展現的效果。中獎物品經過一個隨機數生成。javascript

var index = Math.random()*(lottery.count)|0;

真正開發中中獎物品是經過向後端接口發送請求返回的。html

$("#lottery a").click(function(){
             var islogin=checkLogin();
             if(islogin){//已登陸用戶才能去抽獎
                 if (click) {
                    return false;
                }else{
                    //向後端接口發請求返回中獎結果
                    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結束*/
                 });/*ajax結束*/
            }/*else結束*/
           }
});

二、兼容性說明

.mask開始以下，用的是rgba，可是IE8不兼容，改成使用png圖片background:url(images/mask.png) no-repeat;前端

.mask {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-color: rgba(252,211,4,0.5);
    display: none
}

本文做者starof,因知識自己在變化，做者也在不斷學習成長，文章內容也不定時更新，爲避免誤導讀者，方便追根溯源，請諸位轉載註明出處：http://www.cnblogs.com/starof/p/4933907.html有問題歡迎與我討論，共同進步。java

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