前言

小程序内通过静态模板和样式绘制 canvas ，导出图片，可用于生成分享图等场景

---

一、效果预览

点击生成海报

这个是生成的保存到相册的图片

二、使用步骤

1.安装引入wxml-to-canvas

Step1.运行小程序npm安装命令

npm install --save wxml-to-canvas

Step2.JSON 组件声明

{
  "usingComponents": {
    "wxml-to-canvas": "wxml-to-canvas",
  }
}

文章最后会有wxml-to-canvas的其它详细教程

2.创建js

创建的js放到页面文件夹即可

代码如下（demo.js）：

var calendar = require('../../../utils/calendar');
var d=new Date();
let Year = d.getFullYear();
let Month = (d.getMonth()+1).toString().padStart(2,'0');
let Day = (d.getDate()).toString().padStart(2,'0');
let time = Month+ '/' + Day;
let xq = "星期"+"天一二三四五六".charAt(d.getDay());
const wxml = (hb_describe,hb_bg,hb_wx2code)=>{
    return `
    <view class="container" >
       <view class="itembox1">
         <text class="time">`+time+`</text>
         <view class="xqview">
         <text class="xq">`+xq+`</text>
         <text class="xq2">`+calendar.default.solar2lunar(Year,Month,Day).gzYear+'年'+calendar.default.solar2lunar(Year,Month,Day).IMonthCn+calendar.default.solar2lunar(Year,Month,Day).IDayCn+`</text>
         </view>
       </view>
       <view class="itembox2">
           <image class="img" mode="aspectFit" src="`+hb_bg+`"></image>
       </view>
       <view class="itembox3">
          <text class="text">`+hb_describe+`</text>
          <image class="imgcode" src="`+hb_wx2code+`"></image>
       </view>
     </view>
    `
   }
let width=wx.getSystemInfoSync().windowWidth*0.8;
let widthCenter=width*0.9;
let width6=widthCenter*0.6;//描述占60%
let width4=widthCenter*0.4;
const style = {
    container: {
      width: width,
      height: 450,
      flexDirection: 'column',
      backgroundColor: '#FFFFFF',
      alignItems: 'center'
    },
    itembox1: {
      width: widthCenter,
      height: 130
    },
    itembox2: {
      width: widthCenter,
      height: 200
    },
    itembox3: {
        width: widthCenter,
        height: 120,
        flexDirection: 'row',
        justifyContent:'space-around',
        alignItems: 'center',
        //paddingTop:20,
        //paddingBottom:20
    },
    time:{
        fontSize:88,
        color:'#0222AC',
        textAlign:'center',
        fontStyle:'italic'
    },
    xqview:{
        fontSize:16,
        color:'#0222AC',
        marginTop:106
    },
    xq:{
      textAlign:'left'
    },
    xq2:{
      textAlign:'right'
    },
    img: {
        width: widthCenter,
        minHeight: 190,
        maxHeight: 200,

    },
    imgcode: {
        width: 80,
        height: 80
    },
    text: {
      width: width6,
      height: 60,
      textAlign: 'center',
      verticalAlign: 'middle'
    }
  }
module.exports = {
  wxml,
  style
}

3.小程序页面

wxml:

<!-- 海报 -->
<view class="hbbox" wx:if="{{maskHidden}}">
      <wxml-to-canvas class="widget" height='{{canvasH}}'></wxml-to-canvas>
    </view>
    <view class="padding-sm margin-top flex flex-direction renderToCanvas" wx:if="{{hexiao}}">
      <button bindtap="renderToCanvas" class="cu-btn">活动打卡</button>
    </view>
    <view class='hbmask' hidden="{{maskHidden == false}}">
      <button class='hbbaocun' hidden="{{maskHidden == false}}" bindtap='extraImage'>保存相册</button>
</view>
<!-- 海报end -->

js:
博主这里是打开一个弹窗 在弹窗里展示生成海报，js代码全部放出来，可自行取用。

const {
  wxml,
  style
} = require('./demo.js')
Page({
  data: {
    //海报
    hb_wx2code: "",
    hb_bg: "",
    hb_describe: '',
    maskHidden: false,
    canvasH: 0,
    number:0,
    flag:''
  },
   //生成海报
   makeHB(){
    let that = this;
     that.setData({
      maskHidden: true,
      canvasH:570
     })
     setTimeout(()=>{
       const _wxml = wxml(that.data.hb_describe,that.data.hb_bg,that.data.hb_wx2code)
       wx.nextTick(()=>{
       that.widget = that.selectComponent('.widget')
       const p1 = that.selectComponent('.widget').renderToCanvas({ wxml:_wxml , style })
       p1.then((res) => {
         wx.hideToast();
         that.container = res;
       }).catch(err=>{
       })
     })
     },500)
  },
  renderToCanvas() {
      let that = this;
      if(that.data.hb_wx2code){
         wx.showToast({
          title: '海报生成中...',
          icon: 'loading',
          duration: 1000
        }); 
        that.makeHB();
      }
      else{
        wx.showToast({
          title: '海报生成中...',
          icon: 'loading',
          duration: 1000
        }); 
        const data={
          open_id : wx.getStorageSync('openId'),
          type: '2',
          video_id:that.data.id
        }
        mycomm.ajaxDataGet("/inviteFriends/ordinary", data, function (res) {
          that.setData({
            hb_wx2code: res.val.qr_code,
            hb_bg:res.val.background_img,
            hb_describe:res.val.describe
          });
          that.makeHB();
        }, true);
      }
  },
  extraImage() {
    const p2 = this.widget.canvasToTempFilePath()
    p2.then(res => {
      //   this.setData({
      //     src: res.tempFilePath,
      //     width: this.container.layoutBox.width,
      //     height: this.container.layoutBox.height
      //   })
      this.baocun(res.tempFilePath);
    })
  },
  //点击保存到相册
  baocun: function (imagePath) {
    var that = this
    wx.saveImageToPhotosAlbum({
      filePath: imagePath,
      success(res) {
        wx.showModal({
          content: '海报已保存到相册',
          showCancel: false,
          confirmText: '确定',
          confirmColor: '#333',
          success: function (res) {
            if (res.confirm) {
              /* 该隐藏的隐藏 */
              that.setData({
                maskHidden: false
              })
            }
          },
          fail: function (res) {}
        })
      }
    })
  },
})

4.农历日期js

这个是海报上根据当前日期对应的农历日期，不需要可以自行删除掉。

var calendar = {

    /**
      * 农历1900-2100的润大小信息表
      * @Array Of Property
      * @return Hex
      */
    lunarInfo:[0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,//1900-1909
            0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,//1910-1919
            0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,//1920-1929
            0x06566,0x0d4a0,0x0ea50,0x16a95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,//1930-1939
            0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,//1940-1949
            0x06ca0,0x0b550,0x15355,0x04da0,0x0a5b0,0x14573,0x052b0,0x0a9a8,0x0e950,0x06aa0,//1950-1959
            0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,//1960-1969
            0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b6a0,0x195a6,//1970-1979
            0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,//1980-1989
            0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x05ac0,0x0ab60,0x096d5,0x092e0,//1990-1999
            0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,//2000-2009
            0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,//2010-2019
            0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,//2020-2029
            0x05aa0,0x076a3,0x096d0,0x04afb,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,//2030-2039
            0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0,//2040-2049
            /**Add By JJonline@JJonline.Cn**/
            0x14b63,0x09370,0x049f8,0x04970,0x064b0,0x168a6,0x0ea50, 0x06b20,0x1a6c4,0x0aae0,//2050-2059
            0x092e0,0x0d2e3,0x0c960,0x0d557,0x0d4a0,0x0da50,0x05d55,0x056a0,0x0a6d0,0x055d4,//2060-2069
            0x052d0,0x0a9b8,0x0a950,0x0b4a0,0x0b6a6,0x0ad50,0x055a0,0x0aba4,0x0a5b0,0x052b0,//2070-2079
            0x0b273,0x06930,0x07337,0x06aa0,0x0ad50,0x14b55,0x04b60,0x0a570,0x054e4,0x0d160,//2080-2089
            0x0e968,0x0d520,0x0daa0,0x16aa6,0x056d0,0x04ae0,0x0a9d4,0x0a2d0,0x0d150,0x0f252,//2090-2099
            0x0d520],//2100

    /**
      * 公历每个月份的天数普通表
      * @Array Of Property
      * @return Number
      */
    solarMonth:[31,28,31,30,31,30,31,31,30,31,30,31],

    /**
      * 天干地支之天干速查表
      * @Array Of Property trans["甲","乙","丙","丁","戊","己","庚","辛","壬","癸"]
      * @return Cn string
      */
    Gan:["\u7532","\u4e59","\u4e19","\u4e01","\u620a","\u5df1","\u5e9a","\u8f9b","\u58ec","\u7678"],

    /**
      * 天干地支之地支速查表
      * @Array Of Property
      * @trans["子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥"]
      * @return Cn string
      */
    Zhi:["\u5b50","\u4e11","\u5bc5","\u536f","\u8fb0","\u5df3","\u5348","\u672a","\u7533","\u9149","\u620c","\u4ea5"],

    /**
      * 天干地支之地支速查表<=>生肖
      * @Array Of Property
      * @trans["鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"]
      * @return Cn string
      */
    Animals:["\u9f20","\u725b","\u864e","\u5154","\u9f99","\u86c7","\u9a6c","\u7f8a","\u7334","\u9e21","\u72d7","\u732a"],
    
    /**
     * 阳历节日
     */
    festival: {
      '1-1':   {title: '元旦节'},
      '2-14':  {title: '情人节'},
      '5-1':   {title: '劳动节'},
      '5-4':   {title: '青年节'},
      '6-1':   {title: '儿童节'},
      '9-10':  {title: '教师节'},
      '10-1':  {title: '国庆节'},
      '12-25': {title: '圣诞节'},

      '3-8':   {title: '妇女节'},
      '3-12':  {title: '植树节'},
      '4-1':   {title: '愚人节'},
      '5-12':  {title: '护士节'},
      '7-1':   {title: '建党节'},
      '8-1':   {title: '建军节'},
      '12-24': {title: '平安夜'},
    },

    /**
     * 农历节日
     */
    lfestival: {
      '12-30': {title: '除夕'},
      '1-1':   {title: '春节'},
      '1-15':  {title: '元宵节'},
      '5-5':   {title: '端午节'},
      '8-15':  {title: '中秋节'},
      '9-9':   {title: '重阳节'},
    },

    /**
     * 返回默认定义的阳历节日
     */
    getFestival(){
      return this.festival
    },

    /**
     * 返回默认定义的内容里节日
     */
    getLunarFestival(){
      return this.lfestival
    },

    /**
     * 
     * @param {Object} 按照festival的格式输入数据，设置阳历节日
     */
    setFestival(param={}){
      this.festival = param
    },

    /**
     * 
     * @param {Object} 按照lfestival的格式输入数据，设置农历节日
     */
    setLunarFestival(param={}){
      this.lfestival = param
    },

    /**
      * 24节气速查表
      * @Array Of Property
      * @trans["小寒","大寒","立春","雨水","惊蛰","春分","清明","谷雨","立夏","小满","芒种","夏至","小暑","大暑","立秋","处暑","白露","秋分","寒露","霜降","立冬","小雪","大雪","冬至"]
      * @return Cn string
      */
    solarTerm:["\u5c0f\u5bd2","\u5927\u5bd2","\u7acb\u6625","\u96e8\u6c34","\u60ca\u86f0","\u6625\u5206","\u6e05\u660e","\u8c37\u96e8","\u7acb\u590f","\u5c0f\u6ee1","\u8292\u79cd","\u590f\u81f3","\u5c0f\u6691","\u5927\u6691","\u7acb\u79cb","\u5904\u6691","\u767d\u9732","\u79cb\u5206","\u5bd2\u9732","\u971c\u964d","\u7acb\u51ac","\u5c0f\u96ea","\u5927\u96ea","\u51ac\u81f3"],

    /**
      * 1900-2100各年的24节气日期速查表
      * @Array Of Property
      * @return 0x string For splice
      */
    sTermInfo:['9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf97c3598082c95f8c965cc920f',
              '97bd0b06bdb0722c965ce1cfcc920f','b027097bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c359801ec95f8c965cc920f','97bd0b06bdb0722c965ce1cfcc920f','b027097bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f','97bd0b06bdb0722c965ce1cfcc920f',
              'b027097bd097c36b0b6fc9274c91aa','9778397bd19801ec9210c965cc920e','97b6b97bd19801ec95f8c965cc920f',
              '97bd09801d98082c95f8e1cfcc920f','97bd097bd097c36b0b6fc9210c8dc2','9778397bd197c36c9210c9274c91aa',
              '97b6b97bd19801ec95f8c965cc920e','97bd09801d98082c95f8e1cfcc920f','97bd097bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec95f8c965cc920e','97bcf97c3598082c95f8e1cfcc920f',
              '97bd097bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c3598082c95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c3598082c95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f',
              '97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c359801ec95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f','97bd097bd07f595b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9210c8dc2','9778397bd19801ec9210c9274c920e','97b6b97bd19801ec95f8c965cc920f',
              '97bd07f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c920e',
              '97b6b97bd19801ec95f8c965cc920f','97bd07f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec9210c965cc920e','97bd07f1487f595b0b0bc920fb0722',
              '7f0e397bd097c36b0b6fc9210c8dc2','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf7f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf7f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf7f1487f531b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf7f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c9274c920e','97bcf7f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '9778397bd097c36b0b6fc9210c91aa','97b6b97bd197c36c9210c9274c920e','97bcf7f0e47f531b0b0bb0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c920e',
              '97b6b7f0e47f531b0723b0b6fb0722','7f0e37f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36b0b70c9274c91aa','97b6b7f0e47f531b0723b0b6fb0721','7f0e37f1487f595b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc9210c8dc2','9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b7f0e47f531b0723b0787b0721','7f0e27f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '9778397bd097c36b0b6fc9210c91aa','97b6b7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9210c8dc2','977837f0e37f149b0723b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e37f5307f595b0b0bc920fb0722','7f0e397bd097c35b0b6fc9210c8dc2',
              '977837f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0721','7f0e37f1487f595b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc9210c8dc2','977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','977837f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14998082b0787b06bd',
              '7f07e7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '977837f0e37f14998082b0723b06bd','7f07e7f0e37f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e37f1487f595b0b0bb0b6fb0722','7f0e37f0e37f14898082b0723b02d5',
              '7ec967f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0722','7f0e37f1487f531b0b0bb0b6fb0722',
              '7f0e37f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e37f1487f531b0b0bb0b6fb0722','7f0e37f0e37f14898082b072297c35','7ec967f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e37f0e37f14898082b072297c35',
              '7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f149b0723b0787b0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14998082b0723b06bd',
              '7f07e7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722','7f0e37f0e366aa89801eb072297c35',
              '7ec967f0e37f14998082b0723b06bd','7f07e7f0e37f14998083b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14898082b0723b02d5','7f07e7f0e37f14998082b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e36665b66aa89801e9808297c35','665f67f0e37f14898082b0723b02d5',
              '7ec967f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0722','7f0e36665b66a449801e9808297c35',
              '665f67f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e36665b66a449801e9808297c35','665f67f0e37f14898082b072297c35','7ec967f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e26665b66a449801e9808297c35','665f67f0e37f1489801eb072297c35',
              '7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722'],

    /**
      * 数字转中文速查表
      * @Array Of Property
      * @trans ['日','一','二','三','四','五','六','七','八','九','十']
      * @return Cn string
      */
    nStr1:["\u65e5","\u4e00","\u4e8c","\u4e09","\u56db","\u4e94","\u516d","\u4e03","\u516b","\u4e5d","\u5341"],

    /**
      * 日期转农历称呼速查表
      * @Array Of Property
      * @trans ['初','十','廿','卅']
      * @return Cn string
      */
    nStr2:["\u521d","\u5341","\u5eff","\u5345"],

    /**
      * 月份转农历称呼速查表
      * @Array Of Property
      * @trans ['正','一','二','三','四','五','六','七','八','九','十','冬','腊']
      * @return Cn string
      */
	 
    nStr3:["\u6b63","\u4e8c","\u4e09","\u56db","\u4e94","\u516d","\u4e03","\u516b","\u4e5d","\u5341","\u51ac","\u814a"],
	
    /**
      * 农历年份数字称呼速查表
      * @Array Of Property
      * @trans ['零','一','二','三','四','五','六','七','八','九','十']
      * @return Cn string
      */
	 
    nStr4:["\u96f6","\u4e00","\u4e8c","\u4e09","\u56db","\u4e94","\u516d","\u4e03","\u516b","\u4e5d","\u5341"],
    /**
      * 返回农历y年一整年的总天数
      * @param lunar Year
      * @return Number
      * @eg:var count = calendar.lYearDays(1987) ;//count=387
      */
    lYearDays:function(y) {
        var i, sum = 348;
        for(i=0x8000; i>0x8; i>>=1) { sum += (this.lunarInfo[y-1900] & i)? 1: 0; }
        return(sum+this.leapDays(y));
    },

    /**
      * 返回农历y年闰月是哪个月；若y年没有闰月 则返回0
      * @param lunar Year
      * @return Number (0-12)
      * @eg:var leapMonth = calendar.leapMonth(1987) ;//leapMonth=6
      */
    leapMonth:function(y) { //闰字编码 \u95f0
        return(this.lunarInfo[y-1900] & 0xf);
    },

    /**
      * 返回农历y年闰月的天数 若该年没有闰月则返回0
      * @param lunar Year
      * @return Number (0、29、30)
      * @eg:var leapMonthDay = calendar.leapDays(1987) ;//leapMonthDay=29
      */
    leapDays:function(y) {
        if(this.leapMonth(y))  {
            return((this.lunarInfo[y-1900] & 0x10000)? 30: 29);
        }
        return(0);
    },

    /**
      * 返回农历y年m月（非闰月）的总天数，计算m为闰月时的天数请使用leapDays方法
      * @param lunar Year
      * @return Number (-1、29、30)
      * @eg:var MonthDay = calendar.monthDays(1987,9) ;//MonthDay=29
      */
    monthDays:function(y,m) {
        if(m>12 || m<1) {return -1}//月份参数从1至12，参数错误返回-1
        return( (this.lunarInfo[y-1900] & (0x10000>>m))? 30: 29 );
    },

    /**
      * 返回公历(!)y年m月的天数
      * @param solar Year
      * @return Number (-1、28、29、30、31)
      * @eg:var solarMonthDay = calendar.leapDays(1987) ;//solarMonthDay=30
      */
    solarDays:function(y,m) {
        if(m>12 || m<1) {return -1} //若参数错误 返回-1
        var ms = m-1;
        if(ms==1) { //2月份的闰平规律测算后确认返回28或29
            return(((y%4 == 0) && (y%100 != 0) || (y%400 == 0))? 29: 28);
        }else {
            return(this.solarMonth[ms]);
        }
    },

    /**
     * 农历年份转换为干支纪年
     * @param  lYear 农历年的年份数
     * @return Cn string
     */
    toGanZhiYear:function(lYear) {
        var ganKey = (lYear - 3) % 10;
        var zhiKey = (lYear - 3) % 12;
        if(ganKey == 0) ganKey = 10;//如果余数为0则为最后一个天干
        if(zhiKey == 0) zhiKey = 12;//如果余数为0则为最后一个地支
        return this.Gan[ganKey-1] + this.Zhi[zhiKey-1];

    },

    /**
     * 公历月、日判断所属星座
     * @param  cMonth [description]
     * @param  cDay [description]
     * @return Cn string
     */
    toAstro:function(cMonth,cDay) {
        var s   = "\u9b54\u7faf\u6c34\u74f6\u53cc\u9c7c\u767d\u7f8a\u91d1\u725b\u53cc\u5b50\u5de8\u87f9\u72ee\u5b50\u5904\u5973\u5929\u79e4\u5929\u874e\u5c04\u624b\u9b54\u7faf";
        var arr = [20,19,21,21,21,22,23,23,23,23,22,22];
        return s.substr(cMonth*2 - (cDay < arr[cMonth-1] ? 2 : 0),2) + "\u5ea7";//座
    },

    /**
      * 传入offset偏移量返回干支
      * @param offset 相对甲子的偏移量
      * @return Cn string
      */
    toGanZhi:function(offset) {
        return this.Gan[offset%10] + this.Zhi[offset%12];
    },

    /**
      * 传入公历(!)y年获得该年第n个节气的公历日期
      * @param y公历年(1900-2100)；n二十四节气中的第几个节气(1~24)；从n=1(小寒)算起
      * @return day Number
      * @eg:var _24 = calendar.getTerm(1987,3) ;//_24=4;意即1987年2月4日立春
      */
    getTerm:function(y,n) {
        if(y<1900 || y>2100) {return -1;}
        if(n<1 || n>24) {return -1;}
        var _table = this.sTermInfo[y-1900];
        var _info = [
            parseInt('0x'+_table.substr(0,5)).toString() ,
            parseInt('0x'+_table.substr(5,5)).toString(),
            parseInt('0x'+_table.substr(10,5)).toString(),
            parseInt('0x'+_table.substr(15,5)).toString(),
            parseInt('0x'+_table.substr(20,5)).toString(),
            parseInt('0x'+_table.substr(25,5)).toString()
        ];
        var _calday = [
            _info[0].substr(0,1),
            _info[0].substr(1,2),
            _info[0].substr(3,1),
            _info[0].substr(4,2),

            _info[1].substr(0,1),
            _info[1].substr(1,2),
            _info[1].substr(3,1),
            _info[1].substr(4,2),

            _info[2].substr(0,1),
            _info[2].substr(1,2),
            _info[2].substr(3,1),
            _info[2].substr(4,2),

            _info[3].substr(0,1),
            _info[3].substr(1,2),
            _info[3].substr(3,1),
            _info[3].substr(4,2),

            _info[4].substr(0,1),
            _info[4].substr(1,2),
            _info[4].substr(3,1),
            _info[4].substr(4,2),

            _info[5].substr(0,1),
            _info[5].substr(1,2),
            _info[5].substr(3,1),
            _info[5].substr(4,2),
        ];
        return parseInt(_calday[n-1]);
    },
	/**
	 * 传入年份返回汉语通俗表示法
	 * @param {lunar} year
	 * @return CN {string}
	 * @eg:let cnYear = calendar.toChinaYear(1960);//cnYear = '一九六零'
	 */
	toChinaYear:function(y){ //年
		let year = y.toString().split("");
		return `${this.nStr4[year[0]]}${this.nStr4[year[1]]}${this.nStr4[year[2]]}${this.nStr4[year[3]]}`;
	},
    /**
      * 传入农历数字月份返回汉语通俗表示法
      * @param lunar month
      * @return Cn string
      * @eg:var cnMonth = calendar.toChinaMonth(12) ;//cnMonth='腊月'
      */
    toChinaMonth:function(m) { // 月 => \u6708
        if(m>12 || m<1) {return -1} //若参数错误 返回-1
        var s = this.nStr3[m-1];
        s+= "\u6708";//加上月字
        return s;
    },

    /**
      * 传入农历日期数字返回汉字表示法
      * @param lunar day
      * @return Cn string
      * @eg:var cnDay = calendar.toChinaDay(21) ;//cnMonth='廿一'
      */
    toChinaDay:function(d){ //日 => \u65e5
        var s;
        switch (d) {
            case 10:
            s = '\u521d\u5341'; break;
        case 20:
            s = '\u4e8c\u5341'; break;
            break;
        case 30:
            s = '\u4e09\u5341'; break;
            break;
        default :
            s = this.nStr2[Math.floor(d/10)];
            s += this.nStr1[d%10];
        }
        return(s);
    },

    /**
      * 年份转生肖[!仅能大致转换] => 精确划分生肖分界线是“立春”
      * @param y year
      * @return Cn string
      * @eg:var animal = calendar.getAnimal(1987) ;//animal='兔'
      */
    getAnimal: function(y) {
        return this.Animals[(y - 4) % 12]
    },

    /**
      * 传入阳历年月日获得详细的公历、农历object信息 <=>JSON
      * @param y  solar year
      * @param m  solar month
      * @param d  solar day
      * @return JSON object
      * @eg:console.log(calendar.solar2lunar(1987,11,01));
      */
    solar2lunar:function (y,m,d) { //参数区间1900.1.31~2100.12.31
        y = parseInt(y)
        m = parseInt(m)
        d = parseInt(d)
        //年份限定、上限
        if(y<1900 || y>2100) {
            return -1;// undefined转换为数字变为NaN
        }
        //公历传参最下限
        if(y==1900&&m==1&&d<31) {
            return -1;
        }
        //未传参  获得当天
        if(!y) {
            var objDate = new Date();
        }else {
            var objDate = new Date(y,parseInt(m)-1,d)
        }
        var i, leap=0, temp=0;
        //修正ymd参数
        var y = objDate.getFullYear(),
            m = objDate.getMonth()+1,
            d = objDate.getDate();
        var offset = (Date.UTC(objDate.getFullYear(),objDate.getMonth(),objDate.getDate()) - Date.UTC(1900,0,31))/86400000;
        for(i=1900; i<2101 && offset>0; i++) {
            temp    = this.lYearDays(i);
            offset -= temp;
        }
        if(offset<0) {
            offset+=temp; i--;
        }

        //是否今天
        var isTodayObj = new Date(),
            isToday    = false;
        if(isTodayObj.getFullYear()==y && isTodayObj.getMonth()+1==m && isTodayObj.getDate()==d) {
            isToday = true;
        }
        //星期几
        var nWeek = objDate.getDay(),
           cWeek  = this.nStr1[nWeek];
        //数字表示周几顺应天朝周一开始的惯例
        if(nWeek==0) {
            nWeek = 7;
        }
        //农历年
        var year   = i;
        var leap   = this.leapMonth(i); //闰哪个月
        var isLeap = false;

        //效验闰月
        for(i=1; i<13 && offset>0; i++) {
            //闰月
            if(leap>0 && i==(leap+1) && isLeap==false){
                --i;
                isLeap = true; temp = this.leapDays(year); //计算农历闰月天数
            }
            else{
                temp = this.monthDays(year, i);//计算农历普通月天数
            }
            //解除闰月
            if(isLeap==true && i==(leap+1)) { isLeap = false; }
            offset -= temp;
        }
        // 闰月导致数组下标重叠取反
        if(offset==0 && leap>0 && i==leap+1)
        {
            if(isLeap){
                isLeap = false;
            }else{
                isLeap = true; --i;
            }
        }
        if(offset<0)
        {
            offset += temp; --i;
        }
        //农历月
        var month      = i;
        //农历日
        var day        = offset + 1;
        //天干地支处理
        var sm         = m-1;
        var gzY        = this.toGanZhiYear(year);

        // 当月的两个节气
        // bugfix-2017-7-24 11:03:38 use lunar Year Param `y` Not `year`
        var firstNode  = this.getTerm(y,(m*2-1));//返回当月「节」为几日开始
        var secondNode = this.getTerm(y,(m*2));//返回当月「节」为几日开始

        // 依据12节气修正干支月
        var gzM        = this.toGanZhi((y-1900)*12+m+11);
        if(d>=firstNode) {
            gzM        = this.toGanZhi((y-1900)*12+m+12);
        }

        //传入的日期的节气与否
        var isTerm = false;
        var Term   = null;
        if(firstNode==d) {
            isTerm  = true;
            Term    = this.solarTerm[m*2-2];
        }
        if(secondNode==d) {
            isTerm  = true;
            Term    = this.solarTerm[m*2-1];
        }
        //日柱 当月一日与 1900/1/1 相差天数
        var dayCyclical = Date.UTC(y,sm,1,0,0,0,0)/86400000+25567+10;
        var gzD         = this.toGanZhi(dayCyclical+d-1);
        //该日期所属的星座
        var astro       = this.toAstro(m,d);

        var solarDate = y+'-'+m+'-'+d
        var lunarDate = year+'-'+month+'-'+day

        var festival = this.festival
        var lfestival = this.lfestival

        var festivalDate = m+'-'+d
        var lunarFestivalDate = month+'-'+day

        return {
          date: solarDate,
          lunarDate: lunarDate,
          festival: festival[festivalDate] ? festival[festivalDate].title : null,
          lunarFestival: lfestival[lunarFestivalDate] ? lfestival[lunarFestivalDate].title : null,
          'lYear':year,
          'lMonth':month,
          'lDay':day,
          'Animal':this.getAnimal(year),
          'IMonthCn':(isLeap?"\u95f0":'')+this.toChinaMonth(month),
          'IDayCn':this.toChinaDay(day),
          'cYear':y,
          'cMonth':m,
          'cDay':d,
          'gzYear':gzY,
          'gzMonth':gzM,
          'gzDay':gzD,
          'isToday':isToday,
          'isLeap':isLeap,
          'nWeek':nWeek,
          'ncWeek':"\u661f\u671f"+cWeek,
          'isTerm':isTerm,
          'Term':Term,
          'astro':astro
        };
    },

    /**
      * 传入农历年月日以及传入的月份是否闰月获得详细的公历、农历object信息 <=>JSON
      * @param y  lunar year
      * @param m  lunar month
      * @param d  lunar day
      * @param isLeapMonth  lunar month is leap or not.[如果是农历闰月第四个参数赋值true即可]
      * @return JSON object
      * @eg:console.log(calendar.lunar2solar(1987,9,10));
      */
    lunar2solar:function(y,m,d,isLeapMonth) {   //参数区间1900.1.31~2100.12.1
        y = parseInt(y)
        m = parseInt(m)
        d = parseInt(d)
        var isLeapMonth = !!isLeapMonth;
        var leapOffset  = 0;
        var leapMonth   = this.leapMonth(y);
        var leapDay     = this.leapDays(y);
        if(isLeapMonth&&(leapMonth!=m)) {return -1;}//传参要求计算该闰月公历 但该年得出的闰月与传参的月份并不同
        if(y==2100&&m==12&&d>1 || y==1900&&m==1&&d<31) {return -1;}//超出了最大极限值
        var day  = this.monthDays(y,m);
        var _day = day;
        //bugFix 2016-9-25
        //if month is leap, _day use leapDays method
        if(isLeapMonth) {
            _day = this.leapDays(y,m);
        }
        if(y < 1900 || y > 2100 || d > _day) {return -1;}//参数合法性效验

        //计算农历的时间差
        var offset = 0;
        for(var i=1900;i<y;i++) {
            offset+=this.lYearDays(i);
        }
        var leap = 0,isAdd= false;
        for(var i=1;i<m;i++) {
            leap = this.leapMonth(y);
            if(!isAdd) {//处理闰月
                if(leap<=i && leap>0) {
                    offset+=this.leapDays(y);isAdd = true;
                }
            }
            offset+=this.monthDays(y,i);
        }
        //转换闰月农历 需补充该年闰月的前一个月的时差
        if(isLeapMonth) {offset+=day;}
        //1900年农历正月一日的公历时间为1900年1月30日0时0分0秒(该时间也是本农历的最开始起始点)
        var stmap   =   Date.UTC(1900,1,30,0,0,0);
        var calObj  =   new Date((offset+d-31)*86400000+stmap);
        var cY      =   calObj.getUTCFullYear();
        var cM      =   calObj.getUTCMonth()+1;
        var cD      =   calObj.getUTCDate();

        return this.solar2lunar(cY,cM,cD);
    }
};

export default calendar

---

附其它：

wxml-to-canvas的使用

1. wxml 引入组件

<video class="video" src="{{src}}">
  <wxml-to-canvas class="widget"></wxml-to-canvas>
</video>
<image src="{{src}}" style="width: {{width}}px; height: {{height}}px"></image>

2. js 获取实例

const {wxml, style} = require('./demo.js')
Page({
  data: {
    src: ''
  },
  onLoad() {
    this.widget = this.selectComponent('.widget')
  },
  renderToCanvas() {
    const p1 = this.widget.renderToCanvas({ wxml, style })
    p1.then((res) => {
      this.container = res
      this.extraImage()
    })
  },
  extraImage() {
    const p2 = this.widget.canvasToTempFilePath()
    p2.then(res => {
      this.setData({
        src: res.tempFilePath,
        width: this.container.layoutBox.width,
        height: this.container.layoutBox.height
      })
    })
  }
})

wxml模板支持 view、text、image 三种标签，通过 class 匹配 style 对象中的样式。

样式对象属性值为对应 wxml 标签的 class 驼峰形式。需为每个元素指定 width 和 height 属性，否则会导致布局错误。
存在多个 className 时，位置靠后的优先级更高，子元素会继承父级元素的可继承属性。
元素均为 flex 布局。left/top 等 仅在 absolute 定位下生效。