微信小程序实现日历功能

代码实现

1. index.wxml

<view class='wrap'>
    <view>
        <view class='date-show'>
            <view class='lt-arrow' bindtap='lastMonth'>
                <image src='/images/left_arrow.png' mode='aspectFit'></image>
            </view>
            {{year}}年{{month}}月
            <view class='rt-arrow' bindtap='nextMonth'>
                <image src='/images/right_arrow.png' mode='aspectFit'></image>
            </view>
        </view>
    </view>
    <view class='header'>
        <view wx:for='{{date}}' class='{{(index == todayIndex) && isTodayWeek ? "weekMark" : ""}}'>{{item}}<view></view></view>
    </view>
    <view class='date-box'>
        <view wx:for='{{dateArr}}' class='{{isToday == item.isToday ? "nowDay" : ""}}' data-date='{{item.isToday}}'>
            <view class='date-head'>
                <view>{{item.dateNum}}</view>
            </view>
            <!-- <view class='date-weight'>{{item.weight}}</view> -->
        </view>
    </view>
</view>

2. index.js

Page({
  data: {
    year: 0,
    month: 0,
    date: ['日', '一', '二', '三', '四', '五', '六'],
    dateArr: [],
    isToday: 0,
    isTodayWeek: false,
    todayIndex: 0
  },
  onLoad: function () {
    let now = new Date();
    let year = now.getFullYear();
    let month = now.getMonth() + 1;
    this.dateInit();
    this.setData({
      year: year,
      month: month,
      isToday: '' + year + month + now.getDate()
    })
  },
  dateInit: function (setYear, setMonth) {
    //全部时间的月份都是按0~11基准，显示月份才+1
    let dateArr = [];                        //需要遍历的日历数组数据
    let arrLen = 0;                            //dateArr的数组长度
    let now = setYear ? new Date(setYear, setMonth) : new Date();
    let year = setYear || now.getFullYear();
    let nextYear = 0;
    let month = setMonth || now.getMonth();                    //没有+1方便后面计算当月总天数
    let nextMonth = (month + 1) > 11 ? 1 : (month + 1);
    let startWeek = new Date(year + ',' + (month + 1) + ',' + 1).getDay();                            //目标月1号对应的星期
    let dayNums = new Date(year, nextMonth, 0).getDate();                //获取目标月有多少天
    let obj = {};
    let num = 0;

    if (month + 1 > 11) {
      nextYear = year + 1;
      dayNums = new Date(nextYear, nextMonth, 0).getDate();
    }
    arrLen = startWeek + dayNums;
    for (let i = 0; i < arrLen; i++) {
      if (i >= startWeek) {
        num = i - startWeek + 1;
        obj = {
          isToday: '' + year + (month + 1) + num,
          dateNum: num,
          weight: 5
        }
      } else {
        obj = {};
      }
      dateArr[i] = obj;
    }
    this.setData({
      dateArr: dateArr
    })

    let nowDate = new Date();
    let nowYear = nowDate.getFullYear();
    let nowMonth = nowDate.getMonth() + 1;
    let nowWeek = nowDate.getDay();
    let getYear = setYear || nowYear;
    let getMonth = setMonth >= 0 ? (setMonth + 1) : nowMonth;

    if (nowYear == getYear && nowMonth == getMonth) {
      this.setData({
        isTodayWeek: true,
        todayIndex: nowWeek
      })
    } else {
      this.setData({
        isTodayWeek: false,
        todayIndex: -1
      })
    }
  },
  lastMonth: function () {
    //全部时间的月份都是按0~11基准，显示月份才+1
    let year = this.data.month - 2 < 0 ? this.data.year - 1 : this.data.year;
    let month = this.data.month - 2 < 0 ? 11 : this.data.month - 2;
    this.setData({
      year: year,
      month: (month + 1)
    })
    this.dateInit(year, month);
  },
  nextMonth: function () {
    //全部时间的月份都是按0~11基准，显示月份才+1
    let year = this.data.month > 11 ? this.data.year + 1 : this.data.year;
    let month = this.data.month > 11 ? 0 : this.data.month;
    this.setData({
      year: year,
      month: (month + 1)
    })
    this.dateInit(year, month);
  }
})

3. index.wxss

.date-show{
    position: relative;
    width: 250rpx;
    font-family: PingFang-SC-Regular;
    font-size: 40rpx;
    color: #282828;
    text-align: center;
    margin: 59rpx auto 10rpx;
}
.lt-arrow,.rt-arrow{
    position: absolute;
    top: 1rpx;
    width: 60rpx;
    height: 60rpx;
  padding-right: 0.6rem;
}
.lt-arrow image,.rt-arrow image{
    width: 40rpx;
    height: 40rpx;
}
.lt-arrow{
    left: -110rpx;
    /* transform: rotate(180deg); */
}
.rt-arrow{
    right: -100rpx;
}
.header{
    font-size: 0;
    padding: 0 24rpx;
}
.header>view{
    display: inline-block;
    width: 14.285%;
    color: #333;
    font-size: 30rpx;
    text-align: center;
    border-bottom: 1px solid #D0D0D0;
    padding: 39rpx 0;
}
.weekMark{
    position: relative;
}
.weekMark view{
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    border-bottom: 1px solid #22A7F6;
}
.date-box{
    font-size: 0;
    padding: 10rpx 0;
}
.date-box>view{
    position: relative;
    display: inline-block;
    width: 14.285%;
    color: #020202;
    font-size: 40rpx;
    text-align: center;
    vertical-align: middle;
    margin: 15rpx 0;
}
.date-head{
    height: 60rpx;
    line-height: 60rpx;
    font-size: 26rpx;
}
.nowDay .date-head{
    width: 60rpx;
    border-radius: 50%;
    text-align: center;
    color: #fff;
    background-color: #22A7F6;
    margin: 0 auto;
}
.date-weight{
    font-size: 22rpx;
    padding: 15rpx 0;
}
.nowDay .date-weight{
    color: #22A7F6;
}
.one{
    position: absolute;
    bottom: 0;
    right: 5rpx;
    width: 20rpx;
    height: 20rpx;
    border-radius: 50%;
    background-color: red;
}
.two{
    position: absolute;
    bottom: 30rpx;
    right: 5rpx;
    width: 20rpx;
    height: 20rpx;
    border-radius: 50%;
    background-color: blue;
}

IOS配置日历不显示

把
let startWeek = new Date(year + ',' + (month + 1) + ',' + 1).getDay();    
改成
let startWeek = new Date(year + '/' + (month + 1) + '/' + 1).getDay();