基于javascript实现简单的抽奖系统

Z时代
2024-01-10
分类：综合

本文实例为大家分享了js实现简单的抽奖系统，供大家参考，具体内容如下


<!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>