<!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>开始抽奖！</h2> </div> <div> <span>开始</span> <span>停止</span> </div> <div>支持回车键(Enter)开始/停止。</div> </body> </html>
效果图：
