最近用mpvue做小程序，有一个需求是做九宫格抽奖。因此参考了一篇文章从而封装了一个九宫格抽奖组件，可以直接拿来用。废话不再多说。直接上图上代码。
九宫格组件html代码：
<template>
<div class="container" :style="{width:width,height:height}">
<!-- 背景图 -->
<image :src="backgroundImageUrl" model="aspectFill" class="background_image" v-if="backgroundImageUrl"></image>
<!-- 九宫格 -->
<div class='sudoku'>
<div class="square" :style="{opacity:activatedColorIndex==0?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[0]" model="aspcetFit"></image>
</div>
<div class="square" :style="{opacity:activatedColorIndex==1?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[1]" model="aspcetFit"></image>
</div>
<div class="square" :style="{opacity:activatedColorIndex==2?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[2]" model="aspcetFit"></image>
</div>
<div class="square" :style="{opacity:activatedColorIndex==7?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[7]" model="aspcetFit"></image>
</div>
<div class="square" @click="clickLuck" :style="{width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src='lotteryButtonImage' model="aspcetFit"></image>
</div>
<div class="square" :style="{opacity:activatedColorIndex==3?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[3]" model="aspcetFit"></image>
</div>
<div class="square marginBottomNo" :style="{opacity:activatedColorIndex==6?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[6]" model="aspcetFit"></image>
</div>
<div class="square marginBottomNo" :style="{opacity:activatedColorIndex==5?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[5]" model="aspcetFit"></image>
</div>
<div class="square marginBottomNo" :style="{opacity:activatedColorIndex==4?'1': ( startGame ? '0.5' : '1' ),width:squareWidth,height:squareHeight,marginLeft:squareMarginLeft,marginBottom:squareMarginBottom}">
<image :src="prizeImages[4]" model="aspcetFit"></image>
</div>
</div>
</div>
</template>
九宫格组件js代码：
<script>
/*
* @Author: wujiayi
* @Date: 2019-08-19
* @Last Modified by: wujiayi
* @Last Modified time: 2019-08-19
*/
//定时器
let interval = null;
let timer = null;
//九宫格旋转速度，值越大速度越慢
let rotationalSpeed = 30;
export default {
props:{
width:{ //九宫格容器宽度
type:String,
default:'100%',
},
height:{ //九宫格容器高度
type:String,
default:'100%',
},
backgroundImageUrl:{ //九宫格容器背景图片
type:String,
default:'',
},
squareWidth:{ //九宫格格子宽度
type:String,
default:'31.28%',
},
squareHeight:{ //九宫格格子高度
type:String,
default:'200rpx',
},
squareMarginLeft:{ //九宫格格子左边距
type:String,
default:'3.08%',
},
squareMarginBottom:{ //九宫格格子下边距
type:String,
default:'20rpx',
},
bgColor:{ //九宫格格子背景颜色
type:String,
default:'none',
},
prizeImages:{ //奖品列表图片
type:Array
},
lotteryButtonImage:{ //抽奖按钮图片
type:String,
},
lotteryCount:{ //抽奖次数
type:Number,
default:0,
},
},
data() {
return {
activatedColorIndex: -1, //当前位置选中状态
btnDisabled:false,//抽奖按钮是否可以点击
startGame:false,//是否正在抽奖
};
},
methods: {
//点击抽奖按钮
clickLuck() {
let that = this;
//判断是否可以点击抽奖按钮
if (that.lotteryCount<=0) {
mpvue.showToast({
title:'抽奖次数为0，不可抽奖！',
icon:'none'
})
return
}
if (this.btnDisabled) {
return
}
this.btnDisabled = !this.btnDisabled;
this.startGame = true;
that.lotteryCount--;
interval && clearInterval(interval);
// 九宫格旋转(设置当前位置选中状态)
let index = 0;
interval = setInterval(function() {
if (index > 7) {
index = 0;
}
that.activatedColorIndex = index;
index++;
}, rotationalSpeed);
that.$emit('getlotteryPosition')
},
// 九宫格旋转减速
stop(lotteryPosition) {
let that = this;
interval && clearInterval(interval);
let currentIndex = that.activatedColorIndex + 1;
that.stopLuck(lotteryPosition, currentIndex, rotationalSpeed, 30);
},
/**
* lotteryPosition:中奖位置
* currentIndex:当前选中位置
* speed：九宫格旋转速度
* stepTime：每次增加的旋转时间 值越大旋转速度越慢
*/
stopLuck(lotteryPosition, currentIndex, speed, stepTime) {
let that = this;
timer && clearTimeout(timer);
timer = setTimeout(()=> {
if (currentIndex > 7) {
currentIndex = 0;
}
//当前位置为选中状态
that.activatedColorIndex = currentIndex;
//如果旋转时间过短或者当前位置不等于中奖位置则递归执行直到旋转至中奖位置
if (speed < 300 || currentIndex != lotteryPosition) {
//旋转速度越来越慢
stepTime++;
speed += stepTime;
//当前位置+1
currentIndex++;
that.stopLuck(lotteryPosition, currentIndex, speed, stepTime);
} else {
//抽奖结束
//假设中奖
setTimeout(()=>{
mpvue.showModal({
title: '恭喜中奖',
content: '恭喜您获得xxx',
showCancel: false,
success: function(res) {
if (res.confirm) {
that.activatedColorIndex = -1;
that.btnDisabled = !that.btnDisabled;
that.startGame = false;
}
}
})
},500)
}
}, speed);
}
}
};
</script>
九宫格组件css代码：
<style lang="less" scoped>
.container {
position: relative;
margin: auto;
> .background_image {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
> .sudoku {
width: 100%;
display: flex;
flex-wrap: wrap;
position: relative;
z-index: 2;
> .square {
border-radius: 20rpx;
box-shadow: 0 0 6rpx #e6e6e6;
&:nth-of-type(3n-2) {
margin-left: 0 !important;
}
> image {
width: 100%;
height: 100%;
}
}
> .marginBottomNo {
margin-bottom: 0 !important;
}
}
}
</style>
使用组件demo
<template>
<div style="width:100%;padding:0 40rpx;">
<lottery ref="lottery" @getlotteryPosition = "getlotteryPosition" :lotteryCount="lotteryCount" :prizeImages="prizeImages" :lotteryButtonImage="lotteryButtonImage"></lottery>
</div>
</template>
<script>
import lottery from '@/components/lottery';
export default {
components:{
lottery
},
data() {
return {
lotteryCount:99,//抽奖次数
prizeImages:["https://xxx","https://xxx","https://xxx"...], //奖品列表图片
lotteryButtonImage:"https://xxx",//抽奖按钮图片
};
},
methods: {
getlotteryPosition(){
let that = this;
//模拟网络请求时间
setTimeout(function() {
// 中奖位置
let lotteryPosition = Math.floor(Math.random()*5)+Math.floor(Math.random());
that.$refs.lottery.stop(lotteryPosition);
}, 1000);
}
}
};
</script>
参考文章链接 ：微信小程序九宫格抽奖
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