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[Java教程]jquery——九宫格大转盘抽奖


 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 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;    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><!--效果html结束--></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}

 

 

本文作者starof,因知识本身在变化,作者也在不断学习成长,文章内容也不定时更新,为避免误导读者,方便追根溯源,请诸位转载注明出处:http://www.cnblogs.com/starof/p/4933907.html有问题欢迎与我讨论,共同进步。