JavaScript抽奖系统 - 黑马程序员技术交流社区

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<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>
</body>
</html>

复制代码