小程序开发中如何实现一个日历功能

<!-- 日历 -->
 <view class="gradient">
  <view class="box">
  <view class="spaceAroundCenter flex_align_justify_b">
   <view class="flex-item">
   <view class="item-content flex_align_justify_c" bindtap="doDay" data-key='left'>
    <view class="glyphicon glyphicon-triangle-left">
    <van-icon name="arrow-left" class="flex_align" />
    </view>
   </view>
   </view>
   <view class="flex-item item-content-current-day">
   <view class="item-content flex_align_justify_c">{{currentDate}}</view>
   </view>
   <view class="flex-item">
   <view class="item-content flex_align_justify_c" bindtap="doDay" data-key="right">
    <view class="glyphicon glyphicon-triangle-right">
    <van-icon name="arrow" class="flex_align" />
    </view>
   </view>
   </view>
  </view>

  <view class="spaceAroundCenter">
   <view class="spaceAroundCenter_date">一</view>
   <view class="spaceAroundCenter_date">二</view>
   <view class="spaceAroundCenter_date">三</view>
   <view class="spaceAroundCenter_date">四</view>
   <view class="spaceAroundCenter_date">五</view>
   <view class="spaceAroundCenter_date">六</view>
   <view class="spaceAroundCenter_date">日</view>
  </view>

  <view class="spaceAroundCenter">
   <view class="flex-item day_item" wx:for="{{currentDayList}}" wx:for-index='key' wx:for-item="vo" wx:key="{{key}}">
   <view id='{{vo}}' class="item-content flex_align_justify_c bk-color-day" wx:if="{{vo == currentDay}}" bindtap='onClickItem'>{{vo}}</view>
   <view id='{{vo}}' class="item-content flex_align_justify_c bk-color-dayClick" wx:elif="{{vo == currentClickKey && currentClickKey != '' && vo != ''}}" bindtap='onClickItem'>{{vo}}</view>
   <view id='{{vo}}' class="item-content flex_align_justify_c" bindtap='onClickItem' wx:else>{{vo}}</view>
   <view class="day_item_circle" wx:if="{{currentClickKey!=''&&currentClickKey==vo&&remindlist.length>=1}}"></view>
   </view>
  </view>
  </view>
</view>

/* 日历 */
.gradient{
 background: #fff;
 margin-bottom: 16rpx;
 overflow: hidden;
 border-bottom: 1rpx solid #f1f1f1;
}
.gradient .box{
 padding: 0 24rpx;
}
.glyphicon .iconfont{
 font-size: 46rpx;
}
.spaceAroundCenter {
 display: flex;
 flex-flow: row wrap;
 align-items: center;
 justify-content: space-around;
}
.spaceAroundCenter_date{
 font-size: 28rpx;
}
.flex-item {
 /* flex-flow: nowrap;
 flex-grow: 1;
 flex-shrink: 1; */
 width: 14.2%;
 /* padding: 10rpx 0; */
 height: 85rpx;
 display: flex;
 align-items: center;
 justify-content: center;
}
 
.item-content {
 font-size: 28rpx;
 width:80%;
 height: 60%;
}
 /* 当前日期 */
.bk-color-day {
 color: #fff;
 border-radius: 50%;
 background-color: #dd5923;
}

/* 当前选中日期 */
.bk-color-dayClick {
 color: #fff;
 border-radius: 50%;
 background-color: #30318b;
}
 
.item-content-current-day {
 flex-grow: 2;
}
.day_item{
 position: relative;
}
.day_item_circle{
 width: 10rpx;
 height: 10rpx;
 background: #dd5923;
 position: absolute;
 bottom: 0;
 border-radius: 50%;
}

Page({
 data: {
 currentDayList: '',
 currentObj:'',
 arr: ['', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', ''],
 currentDate:'',
 currentDay:'',
 year:'',
 month:'',
 currentClickKey:'',
 remindlist:[1,2,3]
 },
 onLoad: function (options) {
 var currentObj = this.getCurrentDayString()
 this.setData({
  currentDate: currentObj.getFullYear() + '年' + (currentObj.getMonth() + 1) + '月',
  currentDay: currentObj.getDate(),
  currentObj: currentObj,
  year: currentObj.getFullYear(),
  month: currentObj.getMonth() + 1
 })
 this.setSchedule(currentObj);
 },
 doDay: function (e) {
 this.setData({
  currentClickKey:''
 })
 var arr = this.data.arr;
 for (let i in arr) {
  var newarr = 'arr[' + i + ']';
  this.setData({
  [newarr]: ''
  })
 }
 var that = this
 var currentObj = that.data.currentObj
 var Y = currentObj.getFullYear();
 var m = currentObj.getMonth() + 1;
 var d = currentObj.getDate();
 var str = ''
 if (e.currentTarget.dataset.key == 'left') {
  m -= 1
  if (m <= 0) {
  str = (Y - 1) + '/' + 12 + '/' + d
  } else {
  str = Y + '/' + m + '/' + d
  }
 } else {
  m += 1
  if (m <= 12) {
  str = Y + '/' + m + '/' + d
  } else {
  str = (Y + 1) + '/' + 1 + '/' + d
  }
 }
 currentObj = new Date(str)
 this.setData({
  currentDate: currentObj.getFullYear() + '年' + (currentObj.getMonth() + 1) + '月',
  currentObj: currentObj,
  year: currentObj.getFullYear(),
  month: (currentObj.getMonth() + 1),
  day: ''
 })
 this.setSchedule(currentObj);
 },
 getCurrentDayString: function () {
 var objDate = this.data.currentObj
 if (objDate != '') {
  return objDate
 } else {
  var c_obj = new Date()
  var a = c_obj.getFullYear() + '/' + (c_obj.getMonth() + 1) + '/' + c_obj.getDate()
  return new Date(a)
 }
 },
 setSchedule: function (currentObj) {
 var that = this
 var m = currentObj.getMonth() + 1
 var Y = currentObj.getFullYear()
 var d = currentObj.getDate();
 var dayString = Y + '/' + m + '/' + currentObj.getDate()
 var currentDayNum = new Date(Y, m, 0).getDate()
 var currentDayWeek = currentObj.getUTCDay() + 1
 var result = currentDayWeek - (d % 7 - 1);
 var firstKey = result <= 0 &#63; 7 + result : result;
 var currentDayList = []
 var f = 0
 for (var i = 0; i < 42; i++) {
  let data = []
  if (i < firstKey - 1) {
  currentDayList[i] = ''
  } else {
  if (f < currentDayNum) {
   currentDayList[i] = f + 1
   f = currentDayList[i]
  } else if (f >= currentDayNum) {
   currentDayList[i] = ''
  }
  }
 }
 that.setData({
  currentDayList: currentDayList
 })
 },
 // 设置点击事件
 onClickItem: function (e) {
 // console.log(JSON.stringify(e));
 // console.log(JSON.stringify(e.currentTarget));
 this.setData({
  currentClickKey: e.currentTarget.id
 });
 },
})