javascript跑马灯抽奖实例讲解

本文实例讲解了javascript跑马灯抽奖特效，特别适合用于抽奖活动，分享给大家供大家参考，具体内容如下

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>抽奖游戏</title>
<style>
#box{
  width:720px;
  margin:0 auto;
  margin-top:20px;
  box-shadow:0px 0px 2px #333;
}
.pic{
  width:200px;
  height:200px;
  float:left;
  line-height:200px;
  margin:10px;
  border:5px #fff solid;
  color:blue;
  font-size: 35px;
  text-align: center;
}
.anniu{
  width:200px;
  height:200px;
  float:left;
  margin:10px;
}
#drawBtn{
  color:red;
  font-size:30px;
  width:200px;
  height:200px;
  box-shadow:0px 0px 2px #333;
  font-weight: bold;
}
  </style>
  <script>
  window.onload=init;
    var setting={
    count:0,
    total:24,
    delay:20,
    picIndex:[0,1,2,4,7,6,5,3]
  }
    function init(){
    document.getElementById("drawBtn").onclick=function(){
      setting.count=0;
      setting.delay=20;
      this.disable=true;//禁用按钮
      var drawBtn=this;
      //获取所有图片的div
      var allDivs=document.getElementsByClassName("pic");
      //获得一个随机整数，代表中奖的那个位置，3*8+(0-7)
      setting.total+=Math.floor(Math.random()*allDivs.length);
      //设置定时器，依次修改每个div边框的颜色.
      setTimeout(function show(){
        //重置上一个边框的颜色
       for (var i=0;i<allDivs.length;i++){
         allDivs[i].style.borderColor="#fff";
         allDivs[i].style.opacity=0.7;
       }
        //找到要修改的那个边框的颜色设置
          var currentPic=allDivs[setting.picIndex[setting.count%8]];
          currentPic.style.borderColor="red";
          currentPic.style.opacity=1.0;
        setting.count++;
        setting.delay+=2*setting.count;
          if(setting.count>setting.total){
            alert("您中奖了，哈哈");
            drawBtn.disable=false;
            return;
          }
          setTimeout(show,setting.delay);
      },setting.delay);
    }
    }
  </script>
</head>
<body>
<div id="box">
  <div class="pic">1</div>
  <div class="pic">2</div>
  <div class="pic">3</div>
  <div class="pic">4</div>
  <div class="anniu"><input type="button" value="我要抽奖" id="drawBtn"/></div>
  <div class="pic">5</div>
  <div class="pic">6</div>
  <div class="pic">7</div>
  <div class="pic">8</div>
</div>
</body>
</html>

以上就是本文的详细内容，希望对大家的学习有所帮助。