微信小程序实现打卡日历功能

<!--pages/Calendar/Calendar.wxml-->
<!-- 打卡日历页面 -->
<view class='all'>
 <view class="bar">
 <!-- 上一个月 -->
 <view class="previous" bindtap="handleCalendar" data-handle="prev">
  <image src='../../images/pre.png'></image>
 </view>
 <!-- 显示年月 -->
 <view class="date">{{cur_year || "--"}} 年 {{cur_month || "--"}} 月</view>
 <!-- 下一个月 -->
 <view class="next" bindtap="handleCalendar" data-handle="next">
  <image src='../../images/next.png'></image>
 </view>
 </view>
 <!-- 显示星期 -->
 <view class="week">
 <view wx:for="{{weeks_ch}}" wx:key="{{index}}" data-idx="{{index}}">{{item}}</view>
 </view>
 <view class='days'>
 <!-- 列 -->
 <view class="columns" wx:for="{{days.length/7}}" wx:for-index="i" wx:key="i">
  <view wx:for="{{days}}" wx:for-index="j" wx:key="j">
  <!-- 行 -->
  <view class="rows" wx:if="{{j/7 == i}}">
   <view class="rows" wx:for="{{7}}" wx:for-index="k" wx:key="k">
   <!-- 每个月份的空的单元格 -->
   <view class='cell' wx:if="{{days[j+k].date == null}}">
    <text decode="{{true}}">&nbsp;&nbsp;</text>
   </view>
   <!-- 每个月份的有数字的单元格 -->
   <view class='cell' wx:else>
    <!-- 当前日期已签到 -->
    <view wx:if="{{days[j+k].isSign == true}}" style='background-color:#83C75D' class='cell'>
    <text>{{days[j+k].date}}</text>
    </view>
    <!-- 当前日期未签到 -->
    <view wx:else>
    <text>{{days[j+k].date}}</text>
    </view>
   </view>
   </view>
  </view>
  </view>
 </view>
 </view>
 <!-- 坚持打卡天数 -->
 <view class='count'>
 <text>截至目前，你已坚持打卡</text>
 <view class='daynumber'>
 <text class='number'>{{count}}</text>
 <text class='day'>天</text>
 </view> 
 <text>请再接再厉，继续努力</text>
 </view>
</view>

/ pages/Calendar/Calendar.wxss /
/ 打卡日历 /
.all{
 margin-: 20rpx;
}

.all .bar{
 display: flex;
 flex-direction: row;
 justify-content: space-between;
 margin: 30rpx 20rpx;
 padding: 10rpx;
}

.all .bar image{
 width: 50rpx;
 height: 50rpx;
}

.all .week{
 display: flex;
 flex-direction: row;
 justify-content: space-between;
 padding: 20rpx;
 padding-left: 40rpx;
 padding-right: 40rpx;
 margin: 20rpx;
 border-radius: 10px;
 background-color: #acd;
}

.all .days{
 margin: 20rpx;
 padding: 10rpx;
 border-radius: 10px;
 background-color: #acd;

}

.all .columns{
 display: flex;
 flex-direction: column;
 justify-content: space-between; 
}

.all .columns .rows{
 display: flex;
 flex-direction: row;
 justify-content: space-between;
}

.all .columns .rows .cell{
 width: 84rpx;
 height: 88rpx;
 margin: 3rpx;
 text-align: center;
 border-radius: 50%;
 display: flex;
 flex-direction: column;
 justify-content: center;
}

.count .daynumber{
 display: flex;
 flex-direction: row;
 justify-content: center;
}

.count .daynumber .day{
 margin-: 50rpx;
}

.count{
 margin: 20rpx;
 padding: 30rpx;
 display: flex;
 text-align: center;
 border-radius: 10px;
 flex-direction: column;
 justify-content: center;
 background-color: #acd;
 align-items: center;
}

.count .number{
 color: red;
 font-size: 60rpx;
 background-color: #fff;
 width: 100rpx;
 height: 100rpx;
 border-radius: 50%;
 display: flex;
 flex-direction: column;
 justify-content: center;
 margin: 20rpx;
}

.count text{
 margin: 10rpx;
}

// pages/Calendar/Calendar.js
//打卡日历页面
var util = require('../../utils/util.js');
var Bmob = require('../../utils/bmob.js');
Page({

 /
  页面的初始数据
 /
 data: {
 objectId:'',
 days:[],
 signUp:[],
 cur_year:0,
 cur_month:0,
 count:0
 },

 /
  生命周期函数--监听页面加载
 /
 onLoad: function (options) {
 this.setData({objectId : options.objectId}); 
 //获取当前年月 
 const date = new Date();
 const cur_year = date.getFullYear();
 const cur_month = date.getMonth() + 1;
 const weeks_ch = ['日', '一', '二', '三', '四', '五', '六'];
 this.calculateEmptyGrids(cur_year, cur_month);
 this.calculateDays(cur_year, cur_month);
 //获取当前用户当前任务的签到状态
 this.onGetSignUp();
 this.setData({
  cur_year,
  cur_month,
  weeks_ch
 })

 },

 /
  生命周期函数--监听页面初次渲染完成
 /
 onReady: function () {

 },

 /
  生命周期函数--监听页面显示
 /
 onShow: function () {

 },

 /
  生命周期函数--监听页面隐藏
 /
 onHide: function () {

 },

 /
  生命周期函数--监听页面卸载
 /
 onUnload: function () {

 },

 /
  页面相关事件处理函数--监听用户下拉动作
 /
 onPullDownRefresh: function () {

 },

 /
  页面上拉触底事件的处理函数
 /
 onReachBottom: function () {

 },

 /
  用户点击右上角分享
 /
 onShareAppMessage: function () {

 },
 // 获取当月共多少天
 getThisMonthDays:function(year, month){
  return new Date(year, month, 0).getDate()
 },

 // 获取当月第一天星期几
 getFirstDayOfWeek:function(year, month) {
 return new Date(Date.UTC(year, month - 1, 1)).getDay();
 },

 // 计算当月1号前空了几个格子，把它填充在days数组的前面
 calculateEmptyGrids:function(year, month) {
 var that = this;
 //计算每个月时要清零
 that.setData({days:[]});
 const firstDayOfWeek = this.getFirstDayOfWeek(year, month); 
 if (firstDayOfWeek > 0) {
  for (let i = 0; i < firstDayOfWeek; i++) {
  var obj = {
   date:null,
   isSign:false
  }
  that.data.days.push(obj);
  }
  this.setData({
  days:that.data.days
  });
 //清空
 } else {
  this.setData({
  days: []
  });
 }
 },

 // 绘制当月天数占的格子，并把它放到days数组中
 calculateDays:function(year, month) {
 var that = this;
 const thisMonthDays = this.getThisMonthDays(year, month);
 for (let i = 1; i <= thisMonthDays; i++) {
  var obj = {
  date: i,
  isSign: false
  }
  that.data.days.push(obj);
 }
 this.setData({
  days:that.data.days
 });
 },

 //匹配判断当月与当月哪些日子签到打卡
 onJudgeSign:function(){
 var that = this;
 var signs = that.data.signUp;
 var daysArr = that.data.days;
 for (var i=0; i < signs.length;i++){
  var current = new Date(signs[i].date.replace(/-/g, "/"));
  var year = current.getFullYear();
  var month = current.getMonth()+1;
  var day = current.getDate();
  day = parseInt(day);
  for (var j = 0; j < daysArr.length;j++){
  //年月日相同并且已打卡
  if (year == that.data.cur_year && month == that.data.cur_month && daysArr[j].date == day && signs[i].isSign == "今日已打卡"){
   daysArr[j].isSign = true;
  }
  }
 }
 that.setData({days:daysArr});
 },

 // 切换控制年月，上一个月，下一个月
 handleCalendar:function(e) {
 const handle = e.currentTarget.dataset.handle;
 const cur_year = this.data.cur_year;
 const cur_month = this.data.cur_month;
 if (handle === 'prev') {
  let newMonth = cur_month - 1;
  let newYear = cur_year;
  if (newMonth < 1) {
  newYear = cur_year - 1;
  newMonth = 12;
  }
  this.calculateEmptyGrids(newYear, newMonth);
  this.calculateDays(newYear, newMonth);
  this.onGetSignUp();  
  this.setData({
  cur_year: newYear,
  cur_month: newMonth
  })
 } else {
  let newMonth = cur_month + 1;
  let newYear = cur_year;
  if (newMonth > 12) {
  newYear = cur_year + 1;
  newMonth = 1;
  }
  this.calculateEmptyGrids(newYear, newMonth);
  this.calculateDays(newYear, newMonth);
  this.onGetSignUp();  
  this.setData({
  cur_year: newYear,
  cur_month: newMonth
  })
 }
 },

 //获取当前用户该任务的签到数组
 onGetSignUp:function(){
 var that = this;
 var Task_User = Bmob.Object.extend("task_user");
 var q = new Bmob.Query(Task_User);
 q.get(that.data.objectId, {
  suess: function (result) {
  that.setData({
   signUp : result.get("signUp"),
   count : result.get("score")
  });
  //获取后就判断签到情况
  that.onJudgeSign();
  },
  error: function (object, error) {
  }
 }); 
 }
})

{
 "navigationBarTitleText": "打卡日历"
}