微信小程序日历组件（可滑动，可展开收缩，可标点）

效果图

组件介绍

原生小程序编写，简单轻便，拿来即用。
推荐从代码托管地址获取代码，后续会更新功能： github地址 | gitee地址

代码部分（这里可能不是最新的，推荐去gitee克隆代码）

calendar.wxml

<!--component/calendar/calendar.wxml-->
<view class="calendar">
    <view class="title">
        <view class="header-wrap">
            <view class="flex">
                <view class="title">{{title}}</view>
                <view class="month">
                    <block wx:if="{{title}}">
                        (
                    </block>
                    {{selectDay.year}}年{{selectDay.month}}月
                    <block wx:if="{{title}}">
                        )
                    </block>
                </view>
            </view>
            <block wx:if="{{goNow}}">
                <view wx:if="{{open && !(nowDay.year==selectDay.year&&nowDay.month==selectDay.month&&nowDay.day==selectDay.day)}}" class="today" bindtap="switchNowDate">
                    今日
                </view>
            </block>
        </view>
    </view>

    <!-- 日历头部 -->
    <view class="flex-around calendar-week">
        <view class="view">一</view>
        <view class="view">二</view>
        <view class="view">三</view>
        <view class="view">四</view>
        <view class="view">五</view>
        <view class="view">六</view>
        <view class="view">日</view>
    </view>
    <!-- 日历主体 -->
    <swiper class="swiper" style="height:{{swiperHeight}}rpx" bindchange="swiperChange" circular="{{true}}" current="{{swiperCurrent}}" duration="{{swiperDuration}}">
        <swiper-item wx:for="{{[dateList0, dateList1, dateList2]}}" wx:for-index="listIndex" wx:for-item="listItem" wx:key="listIndex">
            <view class="flex-start flex-wrap calendar-main" style="height:{{listItem.length/7*82}}rpx">
                <view wx:for="{{listItem}}" wx:key="dateList" class="day">
                    <view class="bg {{item.month === selectDay.month?spotMap['y'+item.year+'m'+item.month+'d'+item.day]?spotMap['y'+item.year+'m'+item.month+'d'+item.day]:'':''}} {{(item.year === nowDay.year && item.month === nowDay.month && item.day === nowDay.day) ? 'now' : ''}} {{(item.year === selectDay.year && item.month === selectDay.month) ? (item.day === selectDay.day && oldCurrent === listIndex ?'select':''): 'other-month'}}" catchtap="selectChange" data-day="{{item.day}}" data-year="{{item.year}}" data-month="{{item.month}}">
                        {{item.day}}
                    </view>
                </view>
            </view>
        </swiper-item>
    </swiper>
    <view catchtap="openChange" class="flex list-open">
        <view class="icon {{open?'fold':'unfold'}}"></view>
    </view>
</view>

calendar.js

// component/calendar/calendar.js
Component({
    /**
     * 组件的属性列表
     */
    properties: {
        spotMap: { //标点的日期
            type: Object,
            value: {}
        },
        defaultTime: { //标记的日期，默认为今日
            type: String,
            value: ''
        },
        title: { //标题
            type: String,
            value: ''
        },
        goNow: { // 是否有快速回到今天的功能
            type: Boolean,
            value: true,
        }
    },

    /**
     * 组件的初始数据
     */
    data: {
        selectDay: {}, //选中时间
        nowDay: {}, //现在时间
        open: false,
        swiperCurrent: 1, //选中时间
        oldCurrent: 1, //之前选中时间
        dateList0: [], //0位置的日历数组
        dateList1: [], //1位置的日历数组
        dateList2: [], //2位置的日历数组
        swiperDuration: 500,
        swiperHeight: 0,
        backChange: false, //跳过change切换
    },

    /**
     * 组件的方法列表
     */
    methods: {
        swiperChange(e) { // 日历滑动时触发的方法
            if (this.data.backChange) {
                this.setData({
                    backChange: false
                })
                return
            }
            //计算第三个索引
            let rest = 3 - e.detail.current - this.data.oldCurrent
            let dif = e.detail.current - this.data.oldCurrent
            let date
            if (dif === -2 || (dif > 0 && dif !== 2)) { //向右划的情况，日期增加
                if (this.data.open) {
                    date = new Date(this.data.selectDay.year, this.data.selectDay.month)
                    this.setMonth(date.getFullYear(), date.getMonth() + 1, undefined)
                    this.getIndexList({
                        setYear: this.data.selectDay.year,
                        setMonth: this.data.selectDay.month,
                        dateIndex: rest
                    })
                } else {
                    date = new Date(this.data.selectDay.year, this.data.selectDay.month - 1, this.data.selectDay.day + 7)
                    this.setMonth(date.getFullYear(), date.getMonth() + 1, date.getDate())
                    this.getIndexList({
                        setYear: this.data.selectDay.year,
                        setMonth: this.data.selectDay.month - 1,
                        setDay: this.data.selectDay.day + 7,
                        dateIndex: rest
                    })
                }
            } else { //向左划的情况，日期减少
                if (this.data.open) {
                    date = new Date(this.data.selectDay.year, this.data.selectDay.month - 2)
                    this.setMonth(date.getFullYear(), date.getMonth() + 1, undefined)
                    this.getIndexList({
                        setYear: this.data.selectDay.year,
                        setMonth: this.data.selectDay.month - 2,
                        dateIndex: rest
                    })
                } else {
                    date = new Date(this.data.selectDay.year, this.data.selectDay.month - 1, this.data.selectDay.day - 7)
                    this.setMonth(date.getFullYear(), date.getMonth() + 1, date.getDate())
                    this.getIndexList({
                        setYear: this.data.selectDay.year,
                        setMonth: this.data.selectDay.month - 1,
                        setDay: this.data.selectDay.day - 7,
                        dateIndex: rest
                    })
                }
            }
            this.setData({
                oldCurrent: e.detail.current
            })
            this.setSwiperHeight(e.detail.current)
        },
        setSwiperHeight(index) { // 根据指定位置数组的大小计算长度
            this.setData({
                swiperHeight: this.data[`dateList${index}`].length / 7 * 82 + 18
            })
        },
        //更新指定的索引和月份的列表
        getIndexList({
            setYear,
            setMonth,
            setDay = void 0,
            dateIndex
        }) {
            let appointMonth
            if (setDay)
                appointMonth = new Date(setYear, setMonth, setDay)
            else
                appointMonth = new Date(setYear, setMonth)
            let listName = `dateList${dateIndex}`
            this.setData({
                [listName]: this.dateInit({
                    setYear: appointMonth.getFullYear(),
                    setMonth: appointMonth.getMonth() + 1,
                    setDay: appointMonth.getDate(),
                    hasBack: true
                }),
            })
        },
        //设置月份
        setMonth(setYear, setMonth, setDay) {
            const day = Math.min(new Date(setYear, setMonth, 0).getDate(), this.data.selectDay.day)
            if (this.data.selectDay.year !== setYear || this.data.selectDay.month !== setMonth) {
                const data = {
                    selectDay: {
                        year: setYear,
                        month: setMonth,
                        day: setDay ? setDay : day
                    },
                }
                if (!setDay) {
                    data.open = true
                }
                this.setData(data, () => {
                    this.triggerEvent("selectDay", this.data.selectDay)
                })
            } else {
                const data = {
                    selectDay: {
                        year: setYear,
                        month: setMonth,
                        day: setDay ? setDay : day
                    },
                }
                this.setData(data, () => {
                    this.triggerEvent("selectDay", this.data.selectDay)
                })
            }
        },
        //展开收起
        openChange() {
            this.setData({
                open: !this.data.open
            })
            this.triggerEvent("aaa", {
                a: 0
            })
            // 更新数据
            const selectDate = new Date(this.data.selectDay.year, this.data.selectDay.month - 1, this.data.selectDay.day)
            if (this.data.oldCurrent === 0) {
                this.updateList(selectDate, -1, 2)
                this.updateList(selectDate, 0, 0)
                this.updateList(selectDate, 1, 1)
            } else if (this.data.oldCurrent === 1) {
                this.updateList(selectDate, -1, 0)
                this.updateList(selectDate, 0, 1)
                this.updateList(selectDate, 1, 2)
            } else if (this.data.oldCurrent === 2) {
                this.updateList(selectDate, -1, 1)
                this.updateList(selectDate, 0, 2)
                this.updateList(selectDate, 1, 0)
            }
            this.setSwiperHeight(this.data.oldCurrent)
        },
        // 选中并切换今日日期
        switchNowDate() {
            const now = new Date()
            const selectDate = new Date(this.data.selectDay.year, this.data.selectDay.month - 1, this.data.selectDay.day)
            let dateDiff = (selectDate.getFullYear() - now.getFullYear()) * 12 + (selectDate.getMonth() - now.getMonth())
            let diff = dateDiff === 0 ? 0 : dateDiff > 0 ? -1 : 1
            const diffSum = (x) => (3 + (x % 3)) % 3
            if (this.data.oldCurrent === 0) {
                this.updateList(now, -1, diffSum(2 + diff))
                this.updateList(now, 0, diffSum(0 + diff))
                this.updateList(now, 1, diffSum(1 + diff))
            } else if (this.data.oldCurrent === 1) {
                this.updateList(now, -1, diffSum(0 + diff))
                this.updateList(now, 0, diffSum(1 + diff))
                this.updateList(now, 1, diffSum(2 + diff))
            } else if (this.data.oldCurrent === 2) {
                this.updateList(now, -1, diffSum(1 + diff))
                this.updateList(now, 0, diffSum(2 + diff))
                this.updateList(now, 1, diffSum(0 + diff))
            }
            this.setData({
                swiperCurrent: diffSum(this.data.oldCurrent + diff),
                oldCurrent: diffSum(this.data.oldCurrent + diff),
                backChange: dateDiff !== 0,
            })
            this.setData({
                selectDay: {
                    year: now.getFullYear(),
                    month: now.getMonth() + 1,
                    day: now.getDate()
                }
            }, () => {
                this.triggerEvent("selectDay", this.data.selectDay)
            })
            this.setSwiperHeight(this.data.oldCurrent)
        },
        //日历主体的渲染方法
        dateInit({
            setYear,
            setMonth,
            setDay = this.data.selectDay.day,
            hasBack = false
        } = {
            setYear: this.data.selectDay.year,
            setMonth: this.data.selectDay.month,
            setDay: this.data.selectDay.day,
            hasBack: false
        }) {
            let dateList = []; //需要遍历的日历数组数据
            let now = new Date(setYear, setMonth - 1) //当前月份的1号
            let startWeek = now.getDay(); //目标月1号对应的星期
            let resetStartWeek = startWeek == 0 ? 6 : startWeek - 1; //重新定义星期将星期天替换为6其余-1
            let dayNum = new Date(setYear, setMonth, 0).getDate() //当前月有多少天
            let forNum = Math.ceil((resetStartWeek + dayNum) / 7) * 7 //当前月跨越的周数
            let selectDay = setDay ? setDay : this.data.selectDay.day
            this.triggerEvent("getDateList", {
                setYear: now.getFullYear(),
                setMonth: now.getMonth() + 1
            })
            if (this.data.open) {
                //展开状态，需要渲染完整的月份
                for (let i = 0; i < forNum; i++) {
                    const now2 = new Date(now)
                    now2.setDate(i - resetStartWeek + 1)
                    let obj = {};
                    obj = {
                        day: now2.getDate(),
                        month: now2.getMonth() + 1,
                        year: now2.getFullYear()
                    };
                    dateList[i] = obj;
                }
            } else {
                //非展开状态，只需要渲染当前周
                for (let i = 0; i < 7; i++) {
                    const now2 = new Date(now)
                    //当前周的7天
                    now2.setDate(Math.ceil((selectDay + (startWeek - 1)) / 7) * 7 - 6 - (startWeek - 1) + i)
                    let obj = {};
                    obj = {
                        day: now2.getDate(),
                        month: now2.getMonth() + 1,
                        year: now2.getFullYear()
                    };
                    dateList[i] = obj;
                }
            }
            if (hasBack) {
                return dateList
            }
            this.setData({
                dateList1: dateList
            })
        },
        //一天被点击时
        selectChange(e) {
            const year = e.currentTarget.dataset.year
            const month = e.currentTarget.dataset.month
            const day = e.currentTarget.dataset.day
            const selectDay = {
                year: year,
                month: month,
                day: day,
            }
            if (this.data.open && (this.data.selectDay.year !== year || this.data.selectDay.month !== month)) {
                if ((year * 12 + month) > (this.data.selectDay.year * 12 + this.data.selectDay.month)) { // 下个月
                    if (this.data.oldCurrent == 2)
                        this.setData({
                            swiperCurrent: 0
                        })
                    else
                        this.setData({
                            swiperCurrent: this.data.oldCurrent + 1
                        })
                } else { // 点击上个月
                    if (this.data.oldCurrent == 0)
                        this.setData({
                            swiperCurrent: 2
                        })
                    else
                        this.setData({
                            swiperCurrent: this.data.oldCurrent - 1
                        })
                }
                this.setData({
                    ['selectDay.day']: day
                }, () => {
                    this.triggerEvent("selectDay", this.data.selectDay)
                })
            } else if (this.data.selectDay.day !== day) {
                this.setData({
                    selectDay: selectDay
                }, () => {
                    this.triggerEvent("selectDay", this.data.selectDay)
                })
            }
        },
        updateList(date, offset, index) {
            if (this.data.open) { //打开状态
                const setDate = new Date(date.getFullYear(), date.getMonth() + offset * 1) //取得当前日期的上个月日期
                this.getIndexList({
                    setYear: setDate.getFullYear(),
                    setMonth: setDate.getMonth(),
                    dateIndex: index
                })
            } else {
                const setDate = new Date(date.getFullYear(), date.getMonth(), date.getDate() + offset * 7) //取得当前日期的七天后的日期
                this.getIndexList({
                    setYear: setDate.getFullYear(),
                    setMonth: setDate.getMonth(),
                    setDay: setDate.getDate(),
                    dateIndex: index
                })
            }
        },
    },
    lifetimes: {
        attached() {
            let now = this.data.defaultTime ? new Date(this.data.defaultTime) : new Date()
            let selectDay = {
                year: now.getFullYear(),
                month: now.getMonth() + 1,
                day: now.getDate()
            }
            this.setData({
                nowDay: {
                    year: now.getFullYear(),
                    month: now.getMonth() + 1,
                    day: now.getDate()
                }
            })
            this.setMonth(selectDay.year, selectDay.month, selectDay.day)
            this.updateList(now, -1, 0)
            this.updateList(now, 0, 1)
            this.updateList(now, 1, 2)
            this.setSwiperHeight(1)
        }
    },
    observers: {}
})

calendar.json

{
    "component": true,
    "usingComponents": {}
}

calendar.wxss

/* component/calendar/calendar.wxss */

.icon {
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAACcUlEQVRYhe2WvWtUURDFf8dNVk1ETViMX4WNna22CopELBQUkYASgzFFUPBPsLGSgAqJGDRGBEUsRA0KIthaip2I/4CEoIR8JyP33lldl7fuR1AL9xSP3Xfvmzlz7pl5jyaa+O+hq0NDqDEV8sBGYA3wDZirP4TFhxvFApAD1gPz5TGqF2Xx2pK5puwA9uuPPUA30A48Bd43Ukg2gWpQTHwe2Iax5GRuA6//BoFuwQDQaUF6xaPYBFzCYryXf4yAoAc44We/INjgJvzqGwYwWg2e1Rqzogmt9MwTjgGngBXvgLB8Axh1HyiuiV7BwVoJ1KpAqPqMu70dtFbYNWDC7SqwfoMp0r9BLHbHi2qBa2nDk0A/aAmUF9oscR1pAikJIR4g3RXqUFIoxD0nOLQqAoLjwFlgOuyVKCDGve3KMY54BOqMrBTVDSQON0rgqLfajJCF5IJ7SmdeifBIICgISgQSbUCPYH+9BI4Ag8BidLzY4VXf+V01TmIM9BhU8Gc7gNOCfVn7s0y4N1SuNNuXhbYDDwU3qyX/QUIMm7Eo6HNj7gQueKe8KyfQ4guh2gPAZW+zWdAW4Al1JC+RYjTMBKA3xYpdcZE0O974rlxIXvDeDhv6gF1Kg6UrnrcYqTv5TwwLpi0VFRTd6oTmQB/AckUPrMS5LjpR9MU6n+2rSV7EfRQH1orSwOoC2w0WlQ+XZZ9qs/57CnQFLMnk47A4FdXYx8MYMJl8ECN9hPgSyxdNGM7qC3DLibyt9Ea3rHtmFddK8DzlURvYZ1c5GrA4ueZBr5S8EPp3JjNgyc061QgvsE9gk/4x0+qKN9FEE/8QwHd9qo6ectzgFAAAAABJRU5ErkJggg==");
  background-size: 100% auto;
  width: 32rpx;
  height: 32rpx;
}

.flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.swiper {
  transition: height 0.3s;
}

.header-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.today {
  width: 88rpx;
  height: 42rpx;
  background: #F3F4F4;
  border-radius: 22rpx;
  font-size: 24rpx;
  line-height: 42rpx;
  color: #868D8D;
  text-align: center;
  margin-right: 6rpx;
}

.today:active {
  background: #dfdfdf;
  color: #5f6464;
}

.direction-column {
  flex-direction: column;
}

.flex1 {
  flex: 1;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.flex-start {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.flex-end {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.flex-around {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.align-start {
  align-items: flex-start;
}

.align-end {
  align-items: flex-end;
}

.align-stretch {
  align-items: stretch;
}

.calendar {
  font-family: "PingFang SC", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Helvetica, Arial, "Hiragino Sans GB", "Source Han Sans", "Noto Sans CJK Sc", "Microsoft YaHei", "Microsoft Jhenghei", sans-serif;
}

.calendar .title {
  padding: 10rpx 16rpx 10rpx 20rpx;
  line-height: 60rpx;
  font-size: 32rpx;
  font-weight: 600;
  color: #1C2525;
  line-height: 44px;
  letter-spacing:1px;
}

.calendar .title .year-month {
  margin-right: 20rpx;
}

.calendar .title .icon {
  padding: 0 16rpx;
  font-size: 32rpx;
  color: #999;
}

.calendar .title .open {
  background-color: #f6f6f6;
  color: #999;
  font-size: 22rpx;
  line-height: 36rpx;
  border-radius: 18rpx;
  padding: 0 14rpx;
}

.list-open {
  position: relative;
  justify-content: center;
}

.list-open .icon::after {
  content: '';
  position: absolute;
  top: 16rpx;
  right: 60rpx;
  display: block;
  width: 278rpx;
  height: 0rpx;
  border-bottom: 2rpx solid rgba(214, 219, 219, 0.68);
}

.list-open .icon::before {
  content: '';
  position: absolute;
  top: 16rpx;
  left: 60rpx;
  display: block;
  width: 278rpx;
  height: 0rpx;
  border-bottom: 2rpx solid rgba(214, 219, 219, 0.68);
}

.fold {
  transform: rotate(0deg);
}

.unfold {
  transform: rotate(180deg);
}

.calendar .calendar-week {
  line-height: 40rpx;
  padding: 0 25rpx;
  font-size: 28rpx;
  color: #999;
}

.calendar .calendar-week .view {
  width: 100rpx;
  text-align: center;
}

.calendar .calendar-main {
  padding: 18rpx 25rpx 0rpx;
  transition: height 0.3s;
  align-content: flex-start;
  overflow: hidden;
}

.calendar .calendar-main .day {
  position: relative;
  width: 100rpx;
  color: #666;
  text-align: center;
  height: 82rpx;
}

.calendar .calendar-main .day .bg {
  height: 66rpx;
  line-height: 66rpx;
  font-size: 28rpx;
  color: #333;
}

.calendar .calendar-main .day .now {
  width: 66rpx;
  border-radius: 50%;
  text-align: center;
  color: #0EC0B8;
  background: rgba(14, 192, 184, 0.2);
  margin: 0 auto;
}

.calendar .calendar-main .day .select {
  width: 66rpx;
  border-radius: 50%;
  text-align: center;
  color: #fff;
  background: #0EC0B8;
  margin: 0 auto;
}

.calendar .calendar-main .day .spot::after {
  position: absolute;
  content: "";
  display: block;
  width: 8rpx;
  height: 8rpx;
  bottom: 22rpx;
  background: #0EC0B8;
  border-radius: 50%;
  left: 0;
  right: 0;
  margin: auto;
}

.calendar .calendar-main .day .deep-spot::after {
  position: absolute;
  content: "";
  display: block;
  width: 8rpx;
  height: 8rpx;
  bottom: 22rpx;
  background: #FF7416;
  border-radius: 50%;
  left: 0;
  right: 0;
  margin: auto;
}

.calendar .calendar-main .day .other-month {
  color: #ccc;
}

.header-wrap .month {
  font-size: 28rpx;
  color: #929797;
  line-height: 40rpx;
}