写小程序的时候实在不喜欢小程序从下方弹出的默认日历，毕竟丑还不好操作，所以从网上找了个日历组件

  写博客记录的时候找了一早上原来的抄袭的博客，实在抱歉没找到，如有博客原著看到麻烦留个言，我加上转载

1、效果图片：

2、js代码

js
// components/calendar/calendar.js
/**
 * 日历选择组件
 * 2018-03-04
 * mehaotian
 * github ：https://github.com/mehaotian
 */
Component({
  /**
   * 组件的属性列表
   * data [Date] 当前现实的月份
   * selected [Array] 所有被选择的天
   */
  properties: {
    date: {
      type: null,
      value: new Date()
    },
    selected: {
      type: Array,
      value: [],
      observer(newVal, oldVal) {
        this.getWeek(new Date())
      }
    },
    isOpen: {
      type: Boolean,
      value: false,
    }
  },

  /**
   * 组件的初始数据
   */
  data: {
    calShow: true, // 日历组件是否打开
    dateShow: false, // 日期是否选择
    selectDay: '', // 当前选择日期
    canlender: {
      "weeks": []
    }
  },
  ready() {
    this.getWeek(new Date())
    if (this.data.isOpen) {
      this.setData({
        calShow: false,
        dateShow: true
      })
    }
  },
  /**
   * 组件的方法列表
   */
  methods: {
    dateSelection() {
      if (this.data.isOpen) {
        return
      }
      let self = this;
      if (self.data.calShow) {
        self.setData({
          calShow: false
        }, () => {
          setTimeout(() => {
            self.setData({
              dateShow: true
            }, () => {
              self.triggerEvent('select', { ischeck: !self.data.calShow })
            })
          }, 100)
        })
      } else {
        self.setData({
          dateShow: false
        }, () => {
          setTimeout(() => {
            self.setData({
              calShow: true
            }, () => {
              self.triggerEvent('select', { ischeck: !self.data.calShow })
            })
          }, 300)
        })
      }

    },
    selectDay(e) {
      let index = e.currentTarget.dataset.index;
      let week = e.currentTarget.dataset.week;
      let ischeck = e.currentTarget.dataset.ischeck;
      let canlender = this.data.canlender;
      if (!ischeck) return false;
      let month = canlender.weeks[week][index].month < 10 ? "0" + canlender.weeks[week][index].month : canlender.weeks[week][index].month
      let date = canlender.weeks[week][index].date < 10 ? "0" + canlender.weeks[week][index].date : canlender.weeks[week][index].date
      this.getWeek(canlender.year + "-" + month + "-" + date);

    },
    packup() {

      let self = this;
      if (this.data.isOpen) {
        let year = self.data.canlender.year + "-" + self.data.canlender.month + "-" + self.data.canlender.date
        let _date = self.getDate(year, 0);
        self.getWeek(_date);
        return
      }
      self.setData({
        dateShow: false
      }, () => {
        setTimeout(() => {
          self.setData({
            calShow: true
          }, () => {
            let year = self.data.canlender.year + "-" + self.data.canlender.month + "-" + self.data.canlender.date
            let _date = self.getDate(year, 0);
            self.getWeek(_date);
            self.triggerEvent('select', { ischeck: !self.data.calShow })
          })
        }, 300)
      })
    },
    // 返回今天
    backtoday() { this.getWeek(new Date()); },
    // 前一天|| 后一天
    dataBefor(e) {
      let num = 0;
      let types = e.currentTarget.dataset.type;

      if (e.currentTarget.dataset.id === "0") {
        num = -1;
      } else {
        num = 1
      }
      let year = this.data.canlender.year + "-" + this.data.canlender.month + "-" + this.data.canlender.date
      let _date = this.getDate(year, num, types === 'month' ? "month" : "day");
      this.getWeek(_date);
    },
    // 获取日历内容
    getWeek(dateData) {
      let selected = this.data.selected
      let a = new Date()
      // console.log("im date ", a, typeof a === 'object')
      // 判断当前是 安卓还是ios ，传入不容的日期格式
      if (typeof dateData !== 'object') {
        dateData = dateData.replace(/-/g, "/")
      }
      let _date = new Date(dateData);
      let year = _date.getFullYear(); //年
      let month = _date.getMonth() + 1;  //月
      let date = _date.getDate();//日
      let day = _date.getDay();// 天
      let canlender = [];
      // console.log(selected)
      let dates = {
        firstDay: new Date(year, month - 1, 1).getDay(),
        lastMonthDays: [],// 上个月末尾几天
        currentMonthDys: [], // 本月天数
        nextMonthDays: [], // 下个月开始几天
        endDay: new Date(year, month, 0).getDay(),
        weeks: []
      }

      // 循环上个月末尾几天添加到数组
      for (let i = dates.firstDay; i > 0; i--) {
        dates.lastMonthDays.push({
          'date': new Date(year, month, -i).getDate() + '',
          'month': month - 1
        })
      }
      // 循环本月天数添加到数组
      for (let i = 1; i <= new Date(year, month, 0).getDate(); i++) {
        let have = false;
        for (let j = 0; j < selected.length; j++) {
          let selDate = selected[j].date.split('-');

          if (Number(year) === Number(selDate[0]) && Number(month) === Number(selDate[1]) && Number(i) === Number(selDate[2])) {
            have = true;
          }
        }
        dates.currentMonthDys.push({
          'date': i + "",
          'month': month,
          have
        })
      }
      // 循环下个月开始几天 添加到数组
      for (let i = 1; i < 7 - dates.endDay; i++) {
        dates.nextMonthDays.push({
          'date': i + '',
          'month': month + 1
        })
      }

      canlender = canlender.concat(dates.lastMonthDays, dates.currentMonthDys, dates.nextMonthDays)
      // 拼接数组  上个月开始几天 + 本月天数+ 下个月开始几天
      for (let i = 0; i < canlender.length; i++) {
        if (i % 7 == 0) {
          dates.weeks[parseInt(i / 7)] = new Array(7);
        }
        dates.weeks[parseInt(i / 7)][i % 7] = canlender[i]
      }


      // 渲染数据
      this.setData({
        selectDay: year+"/"+ month + "/" + date,
        "canlender.weeks": dates.weeks,
        'canlender.month': month,
        'canlender.date': date,
        "canlender.day": day,
        'canlender.year': year,
      })
      month = month < 10 ? "0" + month : month
      date = date < 10 ? "0" + date : date
      this.triggerEvent('getdate', { year, month, date })
    },
    /**
     * 时间计算
     */
    getDate(date, AddDayCount, str = 'day') {
      if (typeof date !== 'object') {
        date = date.replace(/-/g, "/")
      }
      let dd = new Date(date)
      switch (str) {
        case 'day':
          dd.setDate(dd.getDate() + AddDayCount)// 获取AddDayCount天后的日期
          break;
        case 'month':
          dd.setMonth(dd.getMonth() + AddDayCount)// 获取AddDayCount天后的日期
          break;
        case 'year':
          dd.setFullYear(dd.getFullYear() + AddDayCount)// 获取AddDayCount天后的日期
          break;
      }
      let y = dd.getFullYear()
      let m = (dd.getMonth() + 1) < 10 ? '0' + (dd.getMonth() + 1) : (dd.getMonth() + 1)// 获取当前月份的日期，不足10补0
      let d = dd.getDate() < 10 ? '0' + dd.getDate() : dd.getDate()// 获取当前几号，不足10补0
      return y + '-' + m + '-' + d
    }
  }
})

2、wxml代码段

xml
<!-- <view class="header space-between"> -->
  <!-- <text class="iconfont" data-id="0" bindtap='dataBefor'>
    <text class='left color'></text>
  </text> -->
  <view  bindtap="dateSelection">
     <image style='width:35px;height:35px' src='/image/time.png'></image>
    <!-- <view class="text">{{selectDay}}</view>
    <text class=""></text> -->
  </view>
  <!-- <text class="iconfont" data-id="1" bindtap='dataBefor'>
    <text class='right color'></text>
  </text> -->
<!-- </view> -->
<view wx:if='{{!calShow}}' class="{{isOpen?'':'calendar-box'}} {{dateShow?'active':''}}" style='z-index:100'>
  <view class="calendar-wrapper {{dateShow?'active':''}}">
    <view class="calendar-panel">
      <view class="date-befor" data-id="0" data-type="month" bindtap='dataBefor'>
        <text class="iconfont">
        <text class='left color'></text>
        </text>
      </view>
      <view class="calendar-panel-box">
        <view>{{canlender.year}}年</view>
        <view>{{canlender.month}}月</view>
      </view>
      <view class="date-after" data-id="1" data-type="month" bindtap='dataBefor'>
        <text class="iconfont">
        <text class='right color'></text>
        </text>
      </view>
      <view class='backtoday' bindtap='backtoday'>
        回到今天
      </view>
    </view>
    <view class="calendar-header">
      <view>日</view>
      <view>一</view>
      <view>二</view>
      <view>三</view>
      <view>四</view>
      <view>五</view>
      <view>六</view>
    </view>
    <view class="calendar-body">
      <block wx:for="{{canlender.weeks}}" wx:for-item="weeks" wx:for-index="week" wx:key="weeks">
        <view class="calender-body-date-week">
          <block wx:for="{{weeks}}" wx:for-item="day" wx:key="day">
            <view class="date {{canlender.month === day.month? '' : 'placeholder'}} {{(day.date==canlender.date||day.checked) && canlender.month == day.month?'date-current': ''}} " data-week="{{week}}" data-index="{{index}}" data-ischeck="{{canlender.month === day.month}}"
              bindtap='selectDay'>
              {{day.date}}
              <view wx:if="{{day.have}}" class="data-circle"></view>
            </view>
          </block>
        </view>
      </block>
    </view>
    <view class="packup" bindtap='packup'>确定</view>
  </view>
</view>

3、json代码段

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

4、wxss代码段

css
/* pages/calendar/calendar.wxss */

.calendar-box {
  position: absolute;
  top: 10%;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0);
  z-index: 999;
  padding-top: 100rpx;
  box-sizing: border-box;
  transition: all 0.3s;
  opacity: 0;
}

.calendar-box.active {
  opacity: 1;
}

.calendar-wrapper {
  width: 100%;
  border-top: 1px #f5f5f5 solid;
  box-sizing: border-box;
  font-size: 26rpx;
  background: #fff;
  transition: all 0.3s;
  transform: translateY(-100%);
}

.calendar-wrapper.active {
  transform: translateY(0%);
}

.header {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  height: 100rpx;
  /* width: 100%; */
  background: #fff;
  /* padding: 0 30rpx; */
  z-index: 10000;
}

.top-jiantou {
  width: 100rpx;
  height: 100rpx;
  text-align: center;
  box-sizing: border-box;
  line-height: 100rpx;
}

.iconfont {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  color: #52b8f5;
  width: 40rpx;
  height: 35rpx;
}

.iconfont .left, .iconfont .right {
  display: block;
  width: 0;
  height: 0;
  border-top: 20rpx solid transparent;
  border-bottom: 20rpx solid transparent;
}

.iconfont .left {
  border-right: 40rpx solid transparent;
}

.iconfont .right {
  border-left: 40rpx solid transparent;
}

.iconfont .left.color {
  border-right-color: #52b8f5;
}

.iconfont .right.color {
  border-left-color: #52b8f5;
}

.btn {
  margin: 0 30rpx;
  width: 240rpx;
  height: 53rpx;
  border: 1rpx solid #52b8f5;
  border-radius: 26rpx;
  color: #52b8f5;
  font-size: 26rpx;
  box-sizing: border-box;
}

.calendar-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32rpx;
  height: 80rpx;
}

.backtoday {
  position: absolute;
  right: 0;
  top: 15rpx;
  padding: 0 10rpx;
  padding-left: 5%;
  height: 50rpx;
  line-height: 50rpx;
  border: 1px #52b8f5 solid;
  border-right: none;
  font-size: 28rpx;
  border-top-left-radius: 50rpx;
  border-bottom-left-radius: 50rpx;
  color: #52b8f5;
  background: rgba(82, 184, 245, 0.1);
}

.date-befor, .date-after {
  /* border: 1px red solid; */
  display: flex;
  justify-content: center;
  align-items: center;
  height: 80rpx;
  width: 80rpx;
  text-align: center;
  line-height: 80rpx;
  /* margin-right: 20rpx; */
}

/* .date-after {
    margin-left: 20rpx;
} */

.calendar-panel-box {
  display: flex;
}

.calendar-header {
  display: flex;
}

.calendar-header view {
  width: 100%;
  text-align: center;
  line-height: 80rpx;
  color: #52b8f5;
}

.calendar-body {
  display: flex;
  flex-wrap: wrap;
}

.calender-body-date-week {
  display: flex;
  width: 100%;
  border-bottom: 1px #f5f5f5 solid;
}

.date {
  position: relative;
  width: 100%;
  text-align: center;
  color: #1c1c1c;
  background: #fff;
  line-height: 100rpx;
}

.date.active {
  background: red;
}

.placeholder {
  color: #a4a4a4;
}

.date-current {
  background: #52b8f5;
  color: #fff;
}

.data-circle {
  position: absolute;
  bottom: 10rpx;
  left: 0;
  right: 0;
  margin: auto;
  width: 10rpx;
  height: 10rpx;
  border-radius: 50%;
  background: #ff5a5f;
  z-index: 2;
}

.packup {
  width: 100%;
  height: 100rpx;
  line-height: 100rpx;
  text-align: center;
  color: #52b8f5;
}

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

5、使用方法

 5.1、在需要使用的页面先注册，.json文件中

"usingComponents": {"calendar": "../../components/calendar/calendar"}，

calendar组件名

../../components/calendar/calendar组件地址

5.2、在.wxml文件中

xml
<calendar bindselect="bindselect" bindgetdate="bindgetdate"></calendar>

5.3、在.js文件中

js
 bindselect(e) {
    var that = this
    console.log("点击日历图标=" + JSON.stringify(that))
  },//日历组件控制
  bindgetdate(e) {

    console.log("选择日期=" + e.detail.year + "-" + e.detail.month + "-" + e.detail.date)

  },//获取选择的日期

6、组件显示样式可在底层文件中更改

7、说几个没完善的地方，方法**bindselect(e)**可添加二次点击收起弹出，点击灰色部分日期时(非当前月所显示的日期)可添加跳转到点击月，并且选中方法

8、当前组件提供了代码块可导入编辑器查看