效果如下：
index code:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>微信大转盘抽奖</title>
<style>
body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0;}
body{color:#333; font-size:12px;font-family:"Microsoft YaHei"}
ul,ol{list-style-type:none;}
select,input,img,select{vertical-align:middle;}
input{ font-size:12px;}
a{ text-decoration:none; color:#000;}
a:hover{color:#c00; text-decoration:none;}
.clear{clear:both;}
/* 大转盘样式 */
.banner{display:block;width:95%;margin-left:auto;margin-right:auto;margin-bottom: 20px;}
.banner .turnplate{display:block;width:100%;position:relative;}
.banner .turnplate canvas.item{width:100%;}
.banner .turnplate img.pointer{position:absolute;width:36%;height:40%;left:32%;top:28%;}
.more{display: block;width: 100%;position: fixed;top: 0;left: 0;height: 150px;}
.cloud{position: fixed;left: 0;top: 70%;width: 150px;}
.cloud2{position: fixed;right: 0;top: 32%;width: 50px;}
.cloud3{position: fixed;left: 0;top: 30%;width: 100px;}
@media screen and (max-width: 320px) {
.cloud{position: fixed;left: 0;top: 70%;width: 150px;}
.cloud2{position: fixed;right: 0;top: 30%;width: 50px;}
.cloud3{position: fixed;left: 0;top: 23%;width: 100px;}
}
@media screen and (min-width: 321px) and (max-width: 375px) {
.cloud{position: fixed;left: 0;top: 72%;width: 150px;}
.cloud2{position: fixed;right: 0;top: 32%;width: 50px;}
.cloud3{position: fixed;left: 0;top: 25%;width: 100px;}
}
@media screen and (min-width: 376px) {
.cloud{position: fixed;left: 0;top: 68%;width: 150px;}
.cloud2{position: fixed;right: 0;top: 32%;width: 50px;}
.cloud3{position: fixed;left: 0;top: 25%;width: 100px;}
}
@media screen and (max-height: 480px) {
.cloud{position: fixed;left: 0;top: 81%;width: 150px;}
.cloud2{position: fixed;right: 0;top: 35%;width: 50px;}
.cloud3{position: fixed;left: 0;top: 27%;width: 100px;}
}
#mark{width: 100%;height: 100%;background: rgba(0,0,0,0.5);position: fixed;top: 0;left: 0;display: none;}
.red-img{position: fixed;top: 10%;left: 5%;width: 90%;}
</style>
</head>
<body style="background:url(images/body_bg2.jpg);background-size:cover;">
<img src="images/4.png" id="shan-img" style="display:none;" />
<img src="images/3.png" id="diy2-img" style="display:none;" />
<img src="images/5.png" id="diy1-img" style="display:none;" />
<img src="images/6.png" id="diy3-img" style="display:none;" />
<img src="images/7.png" id="diy4-img" style="display:none;" />
<img src="images/7.png" id="diy5-img" style="display:none;" />
<div class="banner" style="margin-top: 35%">
<div class="turnplate" style="background-image:url(images/cj_bg.png);background-size:100% 100%;">
<canvas class="item" id="wheelcanvas" width="422px" height="422px"></canvas>
<img class="pointer" src="images/jt2.png"/>
</div>
</div>
<a href="eventDetails.html" class="more"></a>
<img src="images/9.png" class="cloud">
<img src="images/10.png" class="cloud2">
<img src="images/11.png" class="cloud3">
<div id="mark">
<img src="images/red5.png" class="red-img">
</div>
</body>
</html>
<script src="js/jquery-1.10.2.js"></script>
<script src="js/awardRotate.js"></script>
<script>
var turnplate={
restaraunts:[], //大转盘奖品名称
colors:[], //大转盘奖品区块对应背景颜色
outsideRadius:192, //大转盘外圆的半径
textRadius:155, //大转盘奖品位置距离圆心的距离
insideRadius:68, //大转盘内圆的半径
startAngle:0, //开始角度
bRotate:false //false:停止;ture:旋转
};
$(document).ready(function(){
//动态添加大转盘的奖品与奖品区域背景颜色
turnplate.restaraunts = ["碧根果一袋", "年货红包", "水果拼盘300元月卡", "2元现金红包", "夏威夷果一袋", "3元现金红包", "松子一袋 ", "5元现金红包"];
turnplate.colors = ["#FFFFFF","#5fcbd5", "#FFFFFF", "#5fcbd5", "#FFFFFF","#5fcbd5", "#FFFFFF", "#5fcbd5" ];
var rotateTimeOut = function (){
$('#wheelcanvas').rotate({
angle:0,
animateTo:2160,
duration:8000,
callback:function (){
alert('网络超时，请检查您的网络设置！');
}
});
};
//旋转转盘 item:奖品位置; txt：提示语;
var rotateFn = function (item, txt){
var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length*2));
if(angles<270){
angles = 270 - angles;
}else{
angles = 360 - angles + 270;
}
$('#wheelcanvas').stopRotate();
$('#wheelcanvas').rotate({
angle:0,
animateTo:angles+1800,
duration:8000,
callback:function (){
$('#mark').fadeIn();
//alert(txt);
turnplate.bRotate = !turnplate.bRotate;
$('#mark').click(function(){
$(this).hide();
});
}
});
};
$('.pointer').click(function (){
if(turnplate.bRotate)return;
turnplate.bRotate = !turnplate.bRotate;
//获取随机数(奖品个数范围内)
var item = rnd(1,turnplate.restaraunts.length);
//奖品数量等于10,指针落在对应奖品区域的中心角度[252, 216, 180, 144, 108, 72, 36, 360, 324, 288]
rotateFn(item, turnplate.restaraunts[item-1]);
/* switch (item) {
case 1:
rotateFn(252, turnplate.restaraunts[0]);
break;
case 2:
rotateFn(216, turnplate.restaraunts[1]);
break;
case 3:
rotateFn(180, turnplate.restaraunts[2]);
break;
case 4:
rotateFn(144, turnplate.restaraunts[3]);
break;
case 5:
rotateFn(108, turnplate.restaraunts[4]);
break;
case 6:
rotateFn(72, turnplate.restaraunts[5]);
break;
case 7:
rotateFn(36, turnplate.restaraunts[6]);
break;
case 8:
rotateFn(360, turnplate.restaraunts[7]);
break;
case 9:
rotateFn(324, turnplate.restaraunts[8]);
break;
case 10:
rotateFn(288, turnplate.restaraunts[9]);
break;
} */
console.log(item);
});
});
function rnd(n, m){
var random = Math.floor(Math.random()*(m-n+1)+n);
return random;
}
//页面所有元素加载完毕后执行drawRouletteWheel()方法对转盘进行渲染
window.onload=function(){
drawRouletteWheel();
};
function drawRouletteWheel() {
var canvas = document.getElementById("wheelcanvas");
if (canvas.getContext) {
//根据奖品个数计算圆周角度
var arc = Math.PI / (turnplate.restaraunts.length/2);
var ctx = canvas.getContext("2d");
//在给定矩形内清空一个矩形
ctx.clearRect(0,0,422,422);
//strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式
ctx.strokeStyle = "#FFBE04";
//font 属性设置或返回画布上文本内容的当前字体属性
ctx.font = 'bold 18px Microsoft YaHei';
for(var i = 0; i < turnplate.restaraunts.length; i++) {
var angle = turnplate.startAngle + i * arc;
ctx.fillStyle = turnplate.colors[i];
ctx.beginPath();
//arc(x,y,r,起始角,结束角,绘制方向) 方法创建弧/曲线（用于创建圆或部分圆）
ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);
ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);
ctx.stroke();
ctx.fill();
//锁画布(为了保存之前的画布状态)
ctx.save();
//改变画布文字颜色
var b = i+2;
if(b%2){
ctx.fillStyle = "#FFFFFF";
}else{
ctx.fillStyle = "#E5302F";
};
//----绘制奖品开始----
var text = turnplate.restaraunts[i];
var line_height = 17;
//translate方法重新映射画布上的 (0,0) 位置
ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);
//rotate方法旋转当前的绘图
ctx.rotate(angle + arc / 2 + Math.PI / 2);
/** 下面代码根据奖品类型、奖品名称长度渲染不同效果，如字体、颜色、图片效果。(具体根据实际情况改变) **/
if(text.indexOf("盘")>0){//判断字符进行换行
var texts = text.split("盘");
for(var j = 0; j<texts.length; j++){
ctx.font = j == 0?'bold 20px Microsoft YaHei':'bold 18px Microsoft YaHei';
if(j == 0){
ctx.fillText(texts[j]+"盘", -ctx.measureText(texts[j]+"盘").width / 2, j * line_height);
}else{
ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height*1.2); //调整行间距
}
}
}else if(text.indexOf("盘") == -1 && text.length>8){//奖品名称长度超过一定范围
text = text.substring(0,8)+"||"+text.substring(8);
var texts = text.split("||");
for(var j = 0; j<texts.length; j++){
ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
}
}else{
//在画布上绘制填色的文本。文本的默认颜色是黑色
//measureText()方法返回包含一个对象，该对象包含以像素计的指定字体宽度
ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
}
//添加对应图标
if(text.indexOf(turnplate.restaraunts[0])>=0){
var img= document.getElementById("diy1-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[1])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[2])>=0){
var img= document.getElementById("diy5-img");
img.onload=function(){
ctx.drawImage(img,-25,35);
};
ctx.drawImage(img,-30,35);
};
if(text.indexOf(turnplate.restaraunts[3])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[4])>=0){
var img= document.getElementById("diy3-img");
img.onload=function(){
ctx.drawImage(img,-30,20);
};
ctx.drawImage(img,-30,20);
};
if(text.indexOf(turnplate.restaraunts[5])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
if(text.indexOf(turnplate.restaraunts[6])>=0){
var img= document.getElementById("diy2-img");
img.onload=function(){
ctx.drawImage(img,-30,20);
};
ctx.drawImage(img,-30,20);
};
if(text.indexOf(turnplate.restaraunts[7])>=0){
var img= document.getElementById("shan-img");
img.onload=function(){
ctx.drawImage(img,-35,20);
};
ctx.drawImage(img,-35,20);
};
//把当前画布返回（调整）到上一个save()状态之前
ctx.restore();
//----绘制奖品结束----
}
}
};
</script>