uniapp实现简单的九宫格抽奖（附源码）

效果展示

实现步骤：

1.该页面可设置8个奖品，每个奖品可设置中奖机会的权重，如下chance越大，中奖概率越高（大于0）

// 示例代码
prizeList: [
	{
		id: 1,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品1",
		chance: 1
	},
	{
		id: 2,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品2",
		chance: 3
	},{
		id: 3,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品3",
		chance: 1
	},
	{
		id: 4,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品4",
		chance: 1
	},
	{
		id: 5,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品5",
		chance: 1
	},
	{
		id: 6,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品6",
		chance: 1
	},
	{
		id: 7,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品7",
		chance: 2
	},
	{
		id: 8,
		image: "https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp",
		name: "奖品8",
		chance: 1
	}
]
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2.该页面8个奖品加上一个立即抽奖，一共9个格子，可使用flex-wrap布局排列，转到哪个格子就使用border高光标注

<view class="lottery">
	<block v-for="(item, index) in prizeList" :key="index">
		<image class="prize" :class="currentIndex==index?'active':''" src="https://img.alicdn.com/imgextra/i4/1939750137/O1CN01XZivln1CsmzUGGtQF_!!0-saturn_solar.jpg_468x468q75.jpg_.webp" />
		<view v-if="index==3" class="goLottery center_row" :style="btnDisabled?'opacity:0.5;':''" @tap="goLottery">
			<view>立即抽奖view>
		view>
	block>
view>
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3.转动可多次使用不同时间的定时器setInterval和clearInterval结合，不断切换格子active的border位置

// 示例代码
data() {
	return {
		currentIndex: 0,
		runIndexList: [0,1,2,4,7,6,5,3],
		lastRunStepList: [0,1,2,7,3,6,5,4],
		btnDisabled: false,
		prizeList: []
	}
},






let timer = setInterval(() => {
	count--
	currentIndex++
	this.currentIndex = (this.runIndexList[currentIndex % 8])
	if (count < this.prizeList.length * 2) {
		clearInterval(timer)
		let timer2 = setInterval(() => {
			count--
			currentIndex++
			this.currentIndex = (this.runIndexList[currentIndex % 8])
			if (count < this.prizeList.length * 1 - 3) {
				clearInterval(timer2)
				let timer3 = setInterval(() => {
					count--
					currentIndex++
					this.currentIndex = (this.runIndexList[currentIndex % 8])
					if (count <= 0) {
						clearInterval(timer3)
						this.btnDisabled = false
						uni.showToast({
							title: `恭喜您，抽中了${this.prizeList[this.currentIndex].name}`,
							icon: "none"
						})
					}
				}, 400)
			}
	}, 200)
	}
}, 100)
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4.根据提前设定好的奖品概率change随机抽取奖品

// 示例代码
// 返回抽奖结果奖品的index
getResultIndex() {
	let totalChance = 0
	for (let i in this.prizeList) {
		totalChance += Number(this.prizeList[i].chance ? this.prizeList[i].chance : 1)
	}
	// 0 ~ 1
	let random = Math.random()
	let index = 0
	let num = 0
	for (let i in this.prizeList) {
		num += (Number(this.prizeList[i].chance) / totalChance)
		if (random < num) {
			index = Number(i)
			break
		}
	}
	return index
}
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大功告成！

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