Implementing a simple lottery system based on javascript

Implementing a simple lottery system based on javascript_javascript skills

WBOY

Release： 2016-05-16 15:07:38

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The example in this article shares a simple lottery system implemented in js for your reference. The specific content is as follows

<!doctype html>
<html lang="en">
<head>
  <meta charset="gb2312">
  <title>抽奖活动</title>
  <style>
*{
 margin:0;padding:0;
}
#title{
 color:red;text-align:center;margin:0 auto;width:240px;height:70px;padding-top:10px;background:opacity(0);
}
.btns{
 width:190px;height:30px;margin:0px auto;
}
 
.btns span{
 display:block;float:left;width:80px;height:28px;text-align:center;background:#036;color:#fff;cursor:pointer;border:1px solid #eee;border-radius:8px;font-family:"微软雅黑";font-size:14px;line-height:28px;margin-right:10px;
}
#txt{
 font-size:14px;color:#ccc999;text-align:center;margin:0 auto;width:190px;height:50px;padding-top:10px;
}
  </style>
  <script>
 var mytype=["iPhone6s","iPad Air2","DELL外星人","键鼠套装","1000元超市购物卡","200元话费充值卡","谢谢参与","品牌耳机","港澳台7日游","50元优惠券"],//定义奖品池
   timer=null,
   count=0;
//加载时触发
 window.onload=function(){
 var start = document.getElementById("start");
 var stop = document.getElementById("stop");
 
 start.onclick=startFun;//这个函数后面加括号，就直接调用了该函数，所以不要加
 stop.onclick=stopFun;
 
 //绑定键盘事件
 document.onkeyup=function(e){
   e = e || window.event;
  if(e.keyCode==13){
    if(count==0){
    startFun();
    count=1;
    }
  else{  
    stopFun();
    count=0;
    }
  }
 }
 }
 
//点击开始，标题栏开始轮动
 function startFun(){
  clearInterval(timer);//开始时，清除计时器，避免二次触发
  var title = document.getElementById("title");
  var start = document.getElementById("start");
 
  timer = setInterval(function(){
    var num= Math.floor(Math.random()*mytype.length);
    title.innerHTML=mytype[num];
  },50);
  start.style.background="#ccc";
 
 }
 //点击停止，标题栏停止轮动并输出轮动结果
 function stopFun(){
  var start = document.getElementById("start"),
    txt = document.getElementById("txt"),
    title = document.getElementById("title");
  clearInterval(timer);//清除计时器，停止计时器
  start.style.background="#036";
 }
 
 
  </script>
<body>
 <div>
 <h2 id="title">开始抽奖！</h2>
 </div>
 <div class="btns">
 <span id="start">开始</span>
 <span id="stop">停止</span>
 </div>
 <div id="txt">支持回车键(Enter)开始/停止。</div>
</body>
</html>

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