如何基于vue实现倒计时效果

基于vue2 + element

实现画面效果

代码

<template>
    <div>
        <div class="Box">
            <div style="position: relative;">
                <el-progress type="circle" :width="300" :percentage="percentage" :show-text="false">el-progress>
                <div class="time">
                    <h2 v-if="countdown > 0">倒计时{{ countdown }}秒h2>
                    <h2 v-else>倒计时结束h2>
                div>
            div>
            <div style="margin-top: 10px;">
                <el-tag @click="chooseTime(item.num)" style="margin-left: 10px;" v-for="(item, index) in timeList"
                    :key="index">
                    {{ item.name }}
                el-tag>
            div>
            <el-button type="primary" v-if="!is_pause" style="margin-top: 30px;" @click="timeFn">开始el-button>
            <el-button type="danger" v-if="is_pause" style="margin-top: 30px;" @click="pauseFn">暂停el-button>
        div>
    div>
template>

<script>
export default {
    data() {
        return {
            countdown: 60,//倒计时
            countdownNum: 60,
            timer: null,//定时器
            is_pause: false,//是否暂停
            percentage: 100,//圆环百分比
            timeList: [
                {
                    name: '10秒',
                    num: 10
                },
                {
                    name: '30秒',
                    num: 30
                },
                {
                    name: '1分钟',
                    num: 60
                },
                {
                    name: '2分钟',
                    num: 120
                },
                {
                    name: '5分钟',
                    num: 300
                },
            ]
        }
    },
    methods: {
        //开始倒计时
        timeFn() {
            this.is_pause = true
            this.timer = setInterval(() => {
                if (this.countdown > 0) {
                    this.countdown--;
                    // console.log('打印', this.countdown / this.countdownNum)
                    this.percentage = (this.countdown / this.countdownNum).toFixed(2) * 100  //计算圆环百分比
                } else {
                    clearInterval(this.timer);
                    // 倒计时结束后需要执行的操作
                    this.is_pause = false
                }
            }, 1000);
        },
        //暂停倒计时
        pauseFn() {
            clearInterval(this.timer);
            this.is_pause = false
        },
        //选择时间
        chooseTime(num) {
            this.percentage = 100
            this.countdown = num
            this.countdownNum = num
            this.is_pause = false
            clearInterval(this.timer);
        }
    }
}

script>

<style scoped>
.Box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 450px;
    width: 100%;
    padding: 30px 20px;
    box-sizing: border-box;
}

.Box .time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
}
style>