<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="description" content="">
<meta name="author" content="熊仔其人">
<title>转盘抽奖效果</title>
<!-- 这里是css部分 -->
<style>
#bg {
width: 650px;
height: 600px;
margin: 0 auto;
background: url(turntable-bg.jpg) no-repeat;
position: relative;
}
img[src^="pointer"] {
position: absolute;
z-index: 10;
top: 155px;
left: 247px;
}
img[src^="turntable"] {
position: absolute;
z-index: 5;
top: 60px;
left: 116px;
transition: all 4s;
}
</style>
</head>
<body>
<!-- 这里是HTML结构部分 -->
<div id="bg"><img src="pointer.png" alt="pointer"><img src="turntable.png" alt="turntable"></div>
<!-- 这里是js部分 -->
<script>
var oPointer = document.getElementsByTagName("img")[0];
var oTurntable = document.getElementsByTagName("img")[1];
var cat = 51.4; //总共7个扇形区域，每个区域约51.4度
var num = 0; //转圈结束后停留的度数
var offOn = true; //是否正在抽奖
oPointer.onclick = function () {
if (offOn) {
oTurntable.style.transform = "rotate(0deg)";
offOn = !offOn;
ratating();
}
}
//旋转
function ratating() {
var timer = null;
var rdm = 0; //随机度数
clearInterval(timer);
timer = setInterval(function () {
if (Math.floor(rdm / 360) < 3) { rdm = Math.floor(Math.random() * 3600); }
else {
oTurntable.style.transform = "rotate(" + rdm + "deg)";
clearInterval(timer);
setTimeout(function () {
offOn = !offOn;
num = rdm % 360;
if (num <= cat * 1) { alert("4999元"); console.log("rdm=" + rdm + "，num=" + num + "，" + "4999元"); }
else if (num <= cat * 2) { alert("50元"); console.log("rdm=" + rdm + "，num=" + num + "，" + "50元"); }
else if (num <= cat * 3) { alert("10元"); console.log("rdm=" + rdm + "，num=" + num + "，" + "10元"); }
else if (num <= cat * 4) { alert("5元"); console.log("rdm=" + rdm + "，num=" + num + "，" + "5元"); }
else if (num <= cat * 5) { alert("免息服务"); console.log("rdm=" + rdm + "，num=" + num + "，" + "免息服务"); }
else if (num <= cat * 6) { alert("提交白金"); console.log("rdm=" + rdm + "，num=" + num + "，" + "提交白金"); }
else if (num <= cat * 7) { alert("未中奖"); console.log("rdm=" + rdm + "，num=" + num + "，" + "未中奖"); }
}, 4000);
}
}, 30);
}
</script>
</body>
</html>
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