VUE使用day.js显示时分秒并实时更新时间效果实例

npm install dayjs

import dayjs from 'dayjs'

data(){
	return {
	   timeId: null,
	   weeks: ['日', '一', '二', '三', '四', '五', '六'],
       day: dayjs().format('YYYY/MM/DD'),//格式化年月日
       time: dayjs().add(1, 'second').format('HH:mm:ss'),
       //格式化时分秒,用add方法的原因是因为
       week: dayjs().day(),//获取星期几
	}
},
computed: {
	//获得星期几的汉字
	dWeek() {
	   return this.weeks[this.week + 0]
	 }
},
mounted() {
	this.timeId = setInterval(() => {
	  this.time = dayjs().add(1, 'second').format('HH:mm:ss');
	}, 1000);
},
beforeDestroy() {
	  //组件销毁前清楚定时器
	  if (this.timeId) {
	    clearInterval(this.timeId)
	  }
},

<div class="time_text">{{time}}</div>t
<div class="data_text">
  <span>星期{{dWeek}}</span>
  <span>{{day}}</span>
</div>

<template>
  <div>
    <div class="time_text">{{time}}</div>
    <div class="data_text">
      <span>星期{{dWeek}}</span>
      <span>{{day}}</span>
    </div>
  </div>
</template>

<script>
  import dayjs from 'dayjs'
  export default {
    data () {
      return {
        timeId: null,
        weeks: ['日', '一', '二', '三', '四', '五', '六'],
        day: dayjs().format('YYYY/MM/DD'),//格式化年月日
        time: dayjs().add(1, 'second').format('HH:mm:ss'),
        //格式化时分秒,用add方法的原因是因为
        week: dayjs().day(),//获取星期几
      }
    },
    computed: {
      //获得星期几的汉字
      dWeek () {
        return this.weeks[this.week + 0]
      }
    },
    mounted () {
      this.timeId = setInterval(() => {
        this.time = dayjs().add(1, 'second').format('HH:mm:ss');
      }, 1000);
    },
    beforeDestroy () {
      //组件销毁前清楚定时器
      if (this.timeId) {
        clearInterval(this.timeId)
      }
    },
  }
</script>

<style lang="scss" scoped>
//代码样式根据需要调整
</style>

安装
npm install dayjs --save
想要使用的页面引入
var dayjs = require('dayjs')
var dayjsTime = dayjs(`${new Date()}`).format('YYYY-MM-DD HH:mm:ss')   // new Date() 换成自己需要转换的数据
 console.log(dayjsTime) 						// 2019-10-12 15:19:28