// components/animate-numbers/index.js
Component({
  properties: {
    number: {
      type: Number,
      value: 0
    },
    duration: {
      type: Number,
      value: 1000
    }
  },
  data: {
    displayNumber: 0,
    animationFrameId: null
  },
  observers: {
    'number': function (newNumber) {
      this.animateNumber(newNumber);
    }
  },
  methods: {
    animateNumber(targetNumber) {
      const start = this.data.displayNumber;//舊值
      const end = targetNumber;//新值
      const duration = this.properties.duration;
      const increment = (end - start) / (duration / 16); // 假設(shè)每秒60幀，每幀間隔約16ms
      let current = start;
      if(this.data.animationFrameId){
        clearInterval(this.data.animationFrameId);
      }
      const animate = () => {
        current += increment;
        if ((increment > 0 && current >= end) || (increment < 0 && current <= end)) {
          clearInterval(this.data.animationFrameId);
          this.setData({ displayNumber: end });
        } else {
          this.setData({ displayNumber: Math.round(current) });
        }
      };
      this.data.animationFrameId = setInterval(animate, 16);
    }
  },
  // 組件被移除時清除定時器
  detached() {
    clearInterval(this.data.animationFrameId);
  }
});

<view>{{displayNumber}}</view>

page {
  font-size: 48rpx;
  font-weight: bold;
}

 <animate-numbers number="{{attendanceInfo.month_avg_days}}" duration="1000"/>