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需求：根据后台返回的失效时间进行倒计时计算，并实时进行倒计时内容变化

效果：

image-20220324113624357

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//倒计时计算 endDate格式：'2022-03-16 22:19:02'
    
queryTime: function(endDate) {
      var interKey = setInterval(
        () => {
          let date1 = new Date().getTime()
          //处理火狐IE浏览器不兼容问题
          var endtime = endDate.replace(/-/g, '/')
          let date2 = new Date(endtime).getTime()
          let date3 = date2 - date1
          //计算出相差天数
          let days = Math.floor(date3 / (24 * 3600 * 1000))
          //计算出小时数
          let leave1 = date3 % (24 * 3600 * 1000)
          //计算天数后剩余的毫秒数
          let hours = Math.floor(leave1 / (3600 * 1000))
          //计算相差分钟数
          let leave2 = leave1 % (3600 * 1000)
          //计算小时数后剩余的毫秒数
          let minutes = Math.floor(leave2 / (60 * 1000))
          //计算相差秒数
          let leave3 = leave2 % (60 * 1000)
          //计算分钟数后剩余的毫秒数
          let seconds = Math.round(leave3 / 1000)
          console.log(obtainEndDate)
          if (days <= 0 && hours <= 0 && minutes <= 0 && seconds <= 0) {
            this.sydate = '0天0时0分0秒'
            clearInterval(interKey)
            return false
          }
          this.sydate =
            days + '天' + hours + '时' + minutes + '分' + seconds + '秒'
        },
        1000,
        ''
      )
    },