在vue中添加实时时间

　　　　一：在data中定义一个字符串，用于保存时间：nowTime

　　　　二：在methods钩子函数中定义三个函数（注意："星期"+'日一二三四五六'.charAt(new Date().getDay())   这段代码用来获取具体的星期几）　

timeFormate(timeStamp) {
  let year = new Date(timeStamp).getFullYear();
  let month =new Date(timeStamp).getMonth() + 1 < 10? "0" + (new Date(timeStamp).getMonth() + 1): new Date(timeStamp).getMonth() + 1;
  let date =new Date(timeStamp).getDate() < 10? "0" + new Date(timeStamp).getDate(): new Date(timeStamp).getDate();
  let hh =new Date(timeStamp).getHours() < 10? "0" + new Date(timeStamp).getHours(): new Date(timeStamp).getHours();
  let mm =new Date(timeStamp).getMinutes() < 10? "0" + new Date(timeStamp).getMinutes(): new Date(timeStamp).getMinutes();
  let ss =new Date(timeStamp).getSeconds() < 10? "0" + new Date(timeStamp).getSeconds(): new Date(timeStamp).getSeconds();
  this.nowTime = year + "." + month + "." + date +"  "+"星期"+'日一二三四五六'.charAt(new Date().getDay())+" "+hh+":"+mm+':'+ss ;
},
nowTimes(){
  this.timeFormate(new Date());
  setInterval(this.nowTimes,1000);
  this.clear()
},
clear(){
  clearInterval(this.nowTimes)
  this.nowTimes = null;
}

　　　　三：在mounted钩子函数中调用nowTimes函数、在beforeDestroy钩子函数中调用clear函数

mounted() {
      this.nowTimes();
    },
    beforeDestroy() {
      this.clear();
    }

　　　　四：最后，显示在界面上

<div class="head_date">{{nowTime}}</div>

借鉴地址：https://blog.csdn.net/qq_42647749/article/details/100741957