vue 15分钟倒计时

HTML:

<span>{{minute}}:{{second}}</span>

script:

一         

二

// 倒计时
      num(n) {
        return n < 10 ? '0' + n : '' + n
      },
       timer () {
        var _this = this
        var time = window.setInterval(function () {
          if (_this.seconds === 0 && _this.minutes !== 0) {
            _this.seconds = 59
            _this.minutes -= 1
          } else if (_this.minutes === 0 && _this.seconds === 0) {
            _this.seconds = 0
            window.clearInterval(time)
          } else {
            _this.seconds -= 1
          }
        }, 1000)
      }

三      

四

 mounted() {
      this.timer()
    },
    watch: {
      second: {
        handler (newVal) {
          this.num(newVal)

        }
      },
      minute: {
        handler (newVal) {
          this.num(newVal)
        }
      }