HTML + CSS + JS 實現隨機抽獎
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#wrap{
text-align: center;
width:500px;
margin: 100px auto;
position: relative;
}
#ul1{
width: 303px;
height: 303px;
margin: 50px auto;
padding:0;
border-top:1px solid black;
border-left: 1px solid black;
}
#ul1 li{
float: left;
border-right: 1px solid black;
border-bottom: 1px solid black;
list-style: none;
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
}
#tooltips{
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.5);
position: absolute;
top: 0;
z-index: 999;
display: none;
}
#info{
width: 400px;
height: 200px;
background-color: white;
margin: 150px auto;
}
#info .title{
width: 100%;
height: 40px;
background-color: #009f95;
line-height: 40px;
color: white;
padding-left: 20px;
box-sizing: border-box;
}
#info .btn button{
background-color: #009f95;
color: white;
outline: none;
font-size: 10px;
width:60px;
height: 30px;
margin-left: 300px;
}
#info .content {
height: 120px;
padding: 20px;
box-sizing: border-box;
}
</style>
</head>
<body>
<div id="wrap">
<button id="btn">開始抽獎</button>
<button id="btn2">停止</button>
<ul id="ul1">
<li>鼠標</li>
<li>1000萬</li>
<li>100優惠券</li>
<li>很遺憾</li>
<li>鍵盤</li>
<li>iphoneX</li>
<li>很遺憾</li>
<li>迪拜10日遊</li>
<li>很遺憾</li>
</ul>
</div>
<!-- 提示信息 -->
<div id="tooltips">
<div id="info">
<div class="title">信息</div>
<div class="content" id="content-z">恭喜你,中獎了</div>
<div class="btn">
<button id="confirm">確定</button>
</div>
</div>
</div>
<script type="text/javascript">
//思路: 1 實現紅色背景切換 2 當運動停止,彈出對話框--用js去修改tooltips的display 變爲block
var oStart = document.getElementById("btn")
var aLi = document.getElementsByTagName("li")
var oStop = document.getElementById("btn2")
var oTooltips = document.getElementById("tooltips")
var oConfirm = document.getElementById("confirm")
var oContentz = document.getElementById("content-z")
var nowIndex = 0
var timer = null
oStart.onclick = function(){
clearInterval(timer)
timer = setInterval(function(){
for(var i = 0;i<aLi.length;i++){
aLi[i].style.backgroundColor = "white"
}
aLi[nowIndex].style.backgroundColor = "red"
nowIndex = (nowIndex+1) % (aLi.length)
},10)
}
oStop.onclick = function(){
clearInterval(timer)
oTooltips.style.display = "block"
var zhong_jiang = aLi[nowIndex].innerText
console.log(zhong_jiang)
if(zhong_jiang == "很遺憾"){
oContentz.innerText = "很遺憾,沒有中獎"
}else{
oContentz.innerText = "恭喜你,抽中了" + zhong_jiang + "!"
}
}
oConfirm.onclick = function(){
oTooltips.style.display = "none"
for(var i = 0;i<aLi.length;i++){
aLi[i].style.backgroundColor = "white"
}
}
</script>
</body>
</html>