使用uni中的picker-view实现一个可以使用的滚动I日期选择期，并实现月份变化日期也变化

好的，以下是示例代码：

<template>
  <view>
    <picker-view
      :value="dateValue"
      @change="onDateChange"
      style="width: 100%; height: 200px;"
    >
      <picker-view-column>
        <view v-for="(year, index) in years" :key="index">{{ year }}</view>
      </picker-view-column>
      <picker-view-column>
        <view v-for="(month, index) in months" :key="index">{{ month }}</view>
      </picker-view-column>
      <picker-view-column>
        <view v-for="(day, index) in days" :key="index">{{ day }}</view>
      </picker-view-column>
    </picker-view>
  </view>
</template>

<script>
export default {
  data() {
    const now = new Date();
    const years = [];
    const months = [];
    const days = [];
    for (let i = now.getFullYear() - 10; i <= now.getFullYear() + 10; i++) {
      years.push(i);
    }
    for (let i = 1; i <= 12; i++) {
      months.push(i);
    }
    const maxDays = new Date(now.getFullYear(), now.getMonth() + 1, 0).getDate();
    for (let i = 1; i <= maxDays; i++) {
      days.push(i);
    }
    return {
      years,
      months,
      days,
      dateValue: [
        years.indexOf(now.getFullYear()),
        months.indexOf(now.getMonth() + 1),
        days.indexOf(now.getDate()),
      ],
    };
  },
  methods: {
    onDateChange(e) {
      const [yearIndex, monthIndex] = e.detail.value;
      const year = this.years[yearIndex];
      const month = this.months[monthIndex];
      const maxDays = new Date(year, month, 0).getDate();
      const days = [];
      for (let i = 1; i <= maxDays; i++) {
        days.push(i);
      }
      const dateValue = [...e.detail.value];
      const dayIndex = Math.min(dateValue[2], days.length - 1);
      dateValue[2] = dayIndex;
      this.days = days;
      this.dateValue = dateValue;
    },
  },
};
</script>

这里使用了`picker-view`组件，并通过`picker-view-column`子组件分别渲染了年、月、日三个滚动列。在`data`中初始化了可选的年、月、日数据，以及当前日期的默认值。在`onDateChange`方法中，根据用户选择的年月计算出可选的日数据，并更新`days`和`dateValue`，以便实时渲染出正确的日期选择器。