微信小程序实现日历打卡

let currentMonthDays = new Date(year,month,0).getDate() 
//获取当前月份的天数
let startWeek = new Date(year + '/' + month + '/' + 1).getDay(); 
//本月第一天是从星期几开始的

<view class="context">
<view class="top">
  <image src="../../img/left.png" bindtap="bindPreMonth"></image>
  <view>{{year}}年{{month}}月</view>
  <image src="../../img/right.png" bindtap="bindNextMonth"></image>
</view>

<view  class="middle">
  <view wx:for="{{data_arr}}" wx:key="index" class="middle_num">
    {{item}}
  </view>
</view>

<view class="calen">

  <view wx:for="{{startWeek}}" wx:key="index" class="calen_blank"></view>
  <view wx:for="{{currentMonthDays}}" 
  class='{{index+1 == today ? "active": "calen_num"}}' 
    wx:key="index">
  {{index+1}}
  </view>
  
</view>

</view>

Page({
  /**
   * 页面的初始数据
   */
  data: {
    data_arr:["日","一","二","三","四","五","六"],
    year:"",
    month:"",
    today:2 //这是固定2号这天打开，连续几天打卡就用数组就好了
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    let now = new Date()
    let year = now.getFullYear()
    // month获取是从 0~11
    let month = now.getMonth() + 1
    this.setData({
      year,month
    })
    this.showCalendar()
  },

  showCalendar(){
    let {year,month} = this.data
    //以下两个month已经+1
    let currentMonthDays = new Date(year,month,0).getDate() //获取当前月份的天数
    let startWeek = new Date(year + '/' + month + '/' + 1).getDay(); //本月第一天是从星期几开始的
    this.setData({
      currentMonthDays,startWeek
    })
  },

  //上个月按钮
  bindPreMonth(){
    let {year,month} = this.data
    //判断是否是1月
    if(month - 1 >= 1){
      month = month - 1 
    }else{
      month = 12
      year = year - 1
    }
    this.setData({
      month,year
    })
    this.showCalendar()
  },

  //下个月按钮
  bindNextMonth(){
    let {year,month} = this.data
    //判断是否是12月
    if(month + 1 <= 12){
      month = month + 1 
    }else{
      month = 1
      year = year + 1
    }
    this.setData({
      month,year
    })
    this.showCalendar()
  }
})

.context{
  width: 96%;
  background-color: antiquewhite;
  margin: 0 auto;
  padding: 10rpx;
}
.top{
  height: 80rpx;
  display: flex;
  justify-content: space-around;
}
.top image{
  height: 30rpx;
  width: 30rpx;
}
.middle{
  display: flex;
}
.middle_num{
  width: 14%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.calen{
  display: flex;
  height: 400rpx;
  flex-wrap: wrap; /* 必要的时候拆行或拆列。 */
}
.calen_blank{
  width: 14%;
  height: 20%;
  background-color: pink;
}
.calen_num{
  width: 14%;
  height: 20%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.active{
  background-color: rgb(89, 111, 238);
  width: 14%;
  height: 20%;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 40rpx;
}