1、样式
page {width: 100%;height: 100%;}.container {z-index: 1;padding-top: 220rpx;padding-bottom: 20rpx;box-sizing: border-box;height: 100%;}.plate-wrap-box {position: relative;z-index: 999;width: 500rpx;height: 500rpx;border-radius: 50%;margin: 0 auto 60rpx;}.plate-border {position: relative;z-index: 9;width: 500rpx;height: 500rpx;background-color: #22a7ca;border-radius: 50%;}.plate-wrap {position: absolute;left: 50%;top: 50%;transform: translate(-50%, -50%);z-index: 9;width: 440rpx;height: 440rpx;border: 1rpx solid #1f0193;border-radius: 50%;overflow: hidden;margin: auto;}.plate-light {z-index: 1;width: 500rpx;height: 500rpx;border: none;}.plate-box {position: absolute;z-index: 1;left: 50%;width: 0;height: 0;font-size: 24rpx;}.bulb {position: absolute;width: 12rpx;height: 12rpx;left: 50%;top: -242rpx;transform: translate(-50%, 0);border-radius: 50%;background-color: #fdcf03;filter: blur(0.5rpx);}.text-box {position: absolute;text-align: center;display: inline-block;width: 15rpx;word-break: break-all;top: -200rpx;transform: translate(-100%, 0);font-size: 28rpx;}.plate-btn-wrap {position: absolute;z-index: 10;left: 50%;top: 50%;transform: translate(-50%, -50%);width: 110rpx;height: 110rpx;border-radius: 50%;}.plate-btn-wrap::before {content: '';position: absolute;z-index: 9;left: calc(50% - 10rpx);top: -40rpx;transform: translate(-50%, 0);width: 0;height: 0;border-bottom: 80rpx solid #fdcf03;border-left: 20rpx solid transparent;}.plate-btn-wrap::after {content: '';position: absolute;z-index: 9;left: calc(50% + 10rpx);top: -40rpx;transform: translate(-50%, 0);width: 0;height: 0;border-bottom: 80rpx solid #fdcf03;border-right: 20rpx solid transparent;}.plate-btn-box {position: relative;z-index: 11;width: 100%;height: 100%;border-radius: 50%;background-color: #ffe401;display: flex;justify-content: center;align-items: center;}.plate-inner-btn {position: relative;z-index: 999;width: 90rpx;height: 90rpx;border-radius: 50%;background-color: #fdcf03;font-size: 28rpx;font-weight: 800;color: #1f0193;display: flex;justify-content: center;align-items: center;}
2、wxml文件
<view class="container"><view class="plate-wrap-box"><view class="plate-border" animation="{{ aniData }}"><!-- 转盘以及文字 --><view class="plate-wrap"><view class="plate-box" wx:for="{{ lottery }}" wx:key="" style="top:-{{ (lottery.length - 6)<=2?(36+4*(lottery.length - 6)):50 }}rpx;transform-origin: 50% {{ (lottery.length - 6) <=2?(256+4*(lottery.length - 6)):270 }}rpx;border-top: {{ (lottery.length - 6) <=2?(256+4*(lottery.length - 6)):270 }}rpx solid #{{ index % 2==0?'1f0193':'22a7ca' }};transform:translate(-50%,0) rotate({{ 360 / lottery.length * ( index )}}deg);border-left: {{ 440 / lottery.length * 2 }}rpx solid transparent;border-right: {{ 440 / lottery.length * 2 }}rpx solid transparent;"><text class="text-box" style="color:#{{ index % 2==0?'fcff0c':'fcff0c' }}">{{ item }}</text></view></view><!-- 边框的小灯泡 --><view class="plate-wrap plate-light"><view class="plate-box" wx:for="{{ lottery }}" wx:key="" style="top:-{{ (lottery.length - 6)<=2?(44+4*(lottery.length - 6)):60 }}rpx; transform-origin: 50% {{ (lottery.length - 6) <=2?(294+4*(lottery.length - 6)):310 }}rpx;border-top: {{ (lottery.length - 6) <=2?(294+4*(lottery.length - 6)):310 }}rpx solid transparent;transform:translate(-50%,0) rotate({{ 360 / lottery.length * ( index )}}deg);border-left: {{ 500 / lottery.length * 2 }}rpx solid transparent;border-right: {{ 500 / lottery.length * 2 }}rpx solid transparent;"><view class="bulb"></view></view></view></view><view class="plate-btn-wrap" bindtap="startRollTap"><view class="plate-btn-box"><view class="plate-inner-btn"><text>GO</text></view></view></view></view></view>
3、js文件
let canRoll = true, //加控制，防止用户点击两次num = 1, //用在动画上，让用户在第二次点击的时候可以接着上次转动的角度继续转lotteryArrLen = 0, //放奖品的数组的长度lottery = ['奖品1', '奖品2','奖品3']; //放奖品Page({data: {},onLoad(opt) {this.setPlateData(); //执行设置转盘表面的文字let that = this;let aniData = wx.createAnimation({ //创建动画对象duration: 2000,timingFunction: 'ease'});this.aniData = aniData; //将动画对象赋值给this的aniData属性},setPlateData() { //设置奖品数组lotteryArrLen = lottery.length; //获取奖品数组的长度，用来判断if (lotteryArrLen < 2) { //数组的奖品只有一个，扩展数组的长度到4let evenArr = new Array(4); //创建一个数组，方便操作。for (let i = 0; i < 4; i++) {if (i % 2 == 1) { //这里为什么要取1是为了在默认的界面将指针放在谢谢的地方，防止别人拿着中奖的截图来要奖品evenArr[i] = lottery[0]; //将原数组的内容赋值到新的数组} else {evenArr[i] = '谢谢' //在数组中间隔插入谢谢}}lottery = [...evenArr]; //将整合好的数组赋值给lottery数组} else { //数组中的奖品超过1个，则正常扩展数组，扩展的数组为原来的2倍let dataLen = 0; //用来放原来数组的索引let evenArr = new Array(lotteryArrLen * 2); //创建扩展数组for (let i = 0; i < (lotteryArrLen * 2); i++) {if (i % 2 == 1) {evenArr[i] = lottery[dataLen]; //将原来数组的值赋值给新数组dataLen++; //原来数组的索引加一} else {evenArr[i] = '谢谢'}}lottery = [...evenArr]; //将整合好的数组赋值给lottery数组}lotteryArrLen = lottery.length; //获取新的数组长度this.setData({lottery: lottery //设置好值，用于页面展示})},startRollTap() { //开始转盘let that = this;if (canRoll) {canRoll = false;let aniData = this.aniData; //获取this对象上的动画对象let rightNum = ~~(Math.random() * lotteryArrLen); //生成随机数console.log(`随机数是${rightNum}`);console.log(`奖品是：${lottery[rightNum]}`);aniData.rotate(3600 * num - 360 / lotteryArrLen * rightNum).step();this.setData({aniData: aniData.export()})num++;canRoll = true;}}})
4、可能大家会发现一个问题，就是每次回退再次进行抽奖页面扇形面积会增加一倍的奖品数量，后台加上真实数据就可以了。
