<template>
	<div>{{nowDate}}</div>
</template>

<script>
export default {
data() {
    return {
       nowDate: "", // 当前日期
    };
  },
 mounted() {
    this.currentTime();
  },
methods: {

   currentTime() {
     setInterval(this.formatDate, 500);
    },
   formatDate() {
     let date = new Date();
     let year = date.getFullYear(); // 年
     let month = date.getMonth() + 1; // 月
     let day = date.getDate(); // 日
     let week = date.getDay(); // 星期
     let weekArr = [ "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" ];
     let hour = date.getHours(); // 时
     hour = hour < 10 ? "0" + hour : hour; // 如果只有一位，则前面补零
     let minute = date.getMinutes(); // 分
     minute = minute < 10 ? "0" + minute : minute; // 如果只有一位，则前面补零
     let second = date.getSeconds(); // 秒
     second = second < 10 ? "0" + second : second; // 如果只有一位，则前面补零
     this.nowDate = `${year}-${month}-${day} ${hour}:${minute}:${second}`;
   },
   }
   }
   </script>

第二种写法


export function getTime(){
  var now = new Date();
  var year=now.getFullYear();
  var month=now.getMonth()+1;
  var date=now.getDate();
  var hour=now.getHours();
  var minute=now.getMinutes();
  var second=now.getSeconds();
  if(month<10){
    month = '0'+month
  }if(date<10){
    date = '0'+date
  }if(hour<10){
    hour = '0'+hour
  }if(minute<10){
    minute = '0'+minute
  }if(second<10){
    second = '0'+second
  }
  let obj=year+'-'+month+'-'+date+' '+hour+':'+minute
  return obj
}