Mini Program: Code to implement click countdown

var interval = null //倒计时函数
Page({
  data: {
    date:'请选择日期',
    fun_id:2,
    time: '获取验证码', //倒计时 
    currentTime:61
  }, 
  getCode: function (options){
    var that = this;
    var currentTime = that.data.currentTime
    interval = setInterval(function () {
      currentTime--;
      that.setData({
        time: currentTime+'秒'
      })
      if (currentTime <= 0) {
        clearInterval(interval)
        that.setData({
          time: &#39;重新发送&#39;,
          currentTime:61,
          disabled: false   
        })
      }
    }, 100)  
  },
  getVerificationCode(){
    this.getCode();
    var that = this
    that.setData({
      disabled:true
    })
  },

})

<button disabled=&#39;{{disabled}}&#39; data-id="2" bindtap="getVerificationCode">
{{time}}
</button>