大家好！先上图看看本次案例的整体效果。
实现思路：
- Vue component实现大转盘组件，可以嵌套到任意要使用的页面。
- css3 transform控制大转盘抽奖过程的动画效果。
- 抽奖组件内使用钩子函数watch监听抽奖结果的返回情况播放大转盘动画并给用户弹出中奖提示。
- 中奖结果弹窗，为抽奖组件服务。
实现步骤如下：
1. 构建api奖品配置信息和抽奖接口，vuex全局存放奖品配置和中奖结果数据信息。
api：
export default { getPrizeList () { let prizeList = [ { id: 1, name: '小米8', img: 'https://i1.mifile.cn/f/i/g/2015/cn-index/m8-140.png' }, { id: 2, name: '小米电视', img: 'https://i1.mifile.cn/f/i/g/2015/TV4A-43QC.png' }, { id: 3, name: '小米平衡车', img: 'https://i1.mifile.cn/f/i/g/2015/cn-index/scooter-140!140x140.jpg' }, { id: 4, name: '小米耳机', img: 'https://c1.mifile.cn/f/i/g/2015/video/pinpai140!140x140.jpg' } ] return prizeList }, lottery () { return { id: 4, name: '小米耳机', img: 'https://c1.mifile.cn/f/i/g/2015/video/pinpai140!140x140.jpg' } }}store:
import lotteryApi from '../../api/lottery.api.js'const state = { prizeList: [], lotteryResult: {}}const getters = { prizeList: state => state.prizeList, lotteryResult: state => state.lotteryResult}const mutations = { SetPrizeList (state, { prizeList }) { state.prizeList = prizeList }, SetLotteryResult (state, { lotteryResult }) { state.lotteryResult = lotteryResult }}const actions = { getPrizeList ({ commit }) { let result = lotteryApi.getPrizeList() commit('SetPrizeList', { prizeList: result }) }, lottery ({ commit }) { let result = lotteryApi.lottery() commit('SetLotteryResult', { lotteryResult: result }) }}export default { state, getters, mutations, actions, namespaced: true}2. 编写抽奖组件，为保证通用性，组件只负责播放抽奖结果。接收两个数据和一个方法，如下：
数据一：预置的奖品列表数据（轮播奖品需要）
数据二：抽奖结果，播放抽奖动画和弹出中奖结果需要
方法：抽奖动作，返回的抽奖结果数据即为数据二，响应式传递给组件
大概代码思路如下（仅供参考，不可运行）
<template> <section> <div class="lucky-item"> <img src="//www.cnblogs.com/images/cnblogs_com/codeon/878827/o_backImage.jpg" alt> <div class="lucky-box"> <img src="//www.cnblogs.com/images/cnblogs_com/codeon/878827/o_circle.jpg" alt> <ul id="wheel" class="wheel-list" :style="wheelStyle" :class="transition"> <li v-for="(prize,index) in slotPrizes" :style="{transform: 'rotate('+index*45+'deg)'}" v-bind:key="index"> <div class="fan-item" style="transform: rotate(15deg) skewY(45deg);"></div> <div class="lucky-prize"> <h3>{{prize.name}}</h3> </div> </li> </ul> <div class="wheel-btn" @click="$emit('lottery')"> <a> <img src="//images.cnblogs.com/cnblogs_com/codeon/878827/o_go.jpg" alt> </a> </div> </div> <prize-pop :prize="lotteryResult" v-if="showPrize" @closeLotteryPop="showPrize=false" /> </div> </section></template><script>import PrizePop from './common/prize-pop.vue'export default { name: 'BigTurntable', data () { return { isStart: false, showPrize: false, wheelStyle: { 'transform': 'rotate(0deg)' }, transition: 'transitionclear', playTurns: 5 // 默认先旋转5圈 } }, components: { PrizePop }, props: { prizes: { type: Array, required: false }, lotteryResult: { type: Object, default: () => { } } }, computed: { slotPrizes () { var self = this console.log(self.prizes) let prizeList = [] prizeList.push({ ...self.prizes[0], slotIndex: 1 }) prizeList.push({ name: '谢谢参与', slotIndex: 2 }) prizeList.push({ ...self.prizes[1], slotIndex: 3 }) prizeList.push({ name: '谢谢参与', slotIndex: 4 }) prizeList.push({ ...self.prizes[2], slotIndex: 5 }) prizeList.push({ name: '谢谢参与', slotIndex: 6 }) prizeList.push({ ...self.prizes[3], slotIndex: 7 }) prizeList.push({ name: '谢谢参与', slotIndex: 8 }) console.log(prizeList) return prizeList } }, methods: { /** * 执行抽奖动画 */ playWheel (index) { }, /** * 获取中奖结果所在奖品列表中的索引，以确定抽奖动画最终落在哪个奖品 */ getPrizeIndex (prizeId) { } }, watch: {/** * 监听抽奖结果，一旦有中奖信息就开始执行抽奖动画 */ lotteryResult (newVal, oldVal) { var self = this if (newVal.id && newVal.id > 0) { let index = self.getPrizeIndex(newVal.id) self.playWheel(index) } } }}</script>3. 弹出中奖结果组件，依附于抽奖组件，在上一步的执行抽奖结果动画结束后执行。
<template><div class="subject-pop" style="z-index: 10;" v-if="prize.id>0"> <div class="subject-pop-mask"></div> <div class="subject-pop-box"> <h3>恭喜您</h3> <p> <img :src="prize.img" alt> </p> <h4>获得 <span></span> <span>{{prize.name}}</span> </h4> <div class="subject-pop-footer"> <a href="javascript:;" class="november-btn1" @click="closeLotteryEmit">知道了</a> </div> </div> </div></template><script>export default { props: { prize: { type: Object, default: () => { return { id: 0 } } } }, methods: { closeLotteryEmit () { this.$emit('closeLotteryPop') } }}</script>4. 抽奖组件运用在需要使用的页面中，此页面需要为抽奖组件提前准备好预置奖品列表和中奖结果信息，并提供好抽奖方法供子组件（抽奖组件）触发，触发完更改抽奖结果响应式传入到抽奖组件中。
<template> <section> <div style="width:100%;text-align:center;margin:2rem 0;">您有一次抽奖机会，祝君好运~~~</div> <BigTurntable :prizes="prizeList" :lotteryResult="lotteryResult" @lottery="lottery" /> </section></template><script>import { mapGetters, mapActions } from 'vuex'import BigTurntable from '@/components/bigTurntable.vue'export default { name: 'BigTurntableRun', created () { var self = this self.getPrizeList() }, components: { BigTurntable }, computed: { ...mapGetters({ prizeList: 'lottery/prizeList', lotteryResult: 'lottery/lotteryResult' }) }, methods: { ...mapActions({ getPrizeList: 'lottery/getPrizeList', lottery: 'lottery/lottery' }) }}</script>以上就是大转盘抽奖核心步骤的整体思路，欢迎讨论。