效果预览:

wxml部分:

<view class='box1' style='width: {{ sysW * 7 }}px'><view class='dateBox'>{{ year }} - {{ month}}</view><block wx:for='{{ weekArr }}'><view style='width: {{ sysW }}px; height: {{ sysW }}px; line-height: {{ sysW }}px;'>{{ item }}</view></block><block wx:for='{{ arr }}'><view style='{{ index == 0 ? "margin-left:" + sysW * marLet + "px;" : "" }}width: {{ sysW }}px; height: {{ sysW }}px; line-height: {{ sysW }}px;' class='{{ item ==  getDate ? "dateOn" : ""}}'>{{ item }}</view></block>
</view>

wxss部分：

.box1 .dateBox{width: 100%;height: 50px;line-height: 50px;text-align: center;margin-top: 20px;font-size: 40rpx;
}.box1{display: flex;flex-wrap: wrap;margin: 0 auto;
}.box1>view{height: 30px;line-height: 30px;text-align: center;font-size: 34rpx;
}.dateOn{border-radius: 50%;background-color: hotpink;color: #fff;
}

js部分:

// page/index/index.js
Page({/*** 页面的初始数据*/data: {arr: [],sysW: null,lastDay: null,firstDay: null,weekArr: ['日', '一', '二', '三', '四', '五','六'],year: null},//获取日历相关参数dataTime: function () {var date = new Date();var year = date.getFullYear();var month = date.getMonth() ;var months = date.getMonth() + 1;//获取现今年份this.data.year = year;//获取现今月份this.data.month = months;//获取今日日期this.data.getDate = date.getDate();//最后一天是几号var d = new Date(year, months, 0);this.data.lastDay =  d.getDate();//第一天星期几let firstDay = new Date(year, month, 1);this.data.firstDay =  firstDay.getDay();},onLoad: function (options) {this.dataTime();//根据得到今月的最后一天日期遍历 得到所有日期for (var i = 1; i < this.data.lastDay + 1; i++) {this.data.arr.push(i);}var res = wx.getSystemInfoSync();this.setData({sysW: res.windowHeight / 12,//更具屏幕宽度变化自动设置宽度marLet: this.data.firstDay,arr: this.data.arr,year: this.data.year,getDate: this.data.getDate,month: this.data.month});}
})