基于javascript实现简单的抽奖系统

2019-11-20 10:19:51

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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>

效果图：