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

生成海报

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
这里创建了demo.js

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 = thiswx.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,//1900-19090x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,//1910-19190x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,//1920-19290x06566,0x0d4a0,0x0ea50,0x16a95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,//1930-19390x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,//1940-19490x06ca0,0x0b550,0x15355,0x04da0,0x0a5b0,0x14573,0x052b0,0x0a9a8,0x0e950,0x06aa0,//1950-19590x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,//1960-19690x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b6a0,0x195a6,//1970-19790x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,//1980-19890x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x05ac0,0x0ab60,0x096d5,0x092e0,//1990-19990x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,//2000-20090x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,//2010-20190x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,//2020-20290x05aa0,0x076a3,0x096d0,0x04afb,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,//2030-20390x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0,//2040-2049/**Add By JJonline@JJonline.Cn**/0x14b63,0x09370,0x049f8,0x04970,0x064b0,0x168a6,0x0ea50, 0x06b20,0x1a6c4,0x0aae0,//2050-20590x092e0,0x0d2e3,0x0c960,0x0d557,0x0d4a0,0x0da50,0x05d55,0x056a0,0x0a6d0,0x055d4,//2060-20690x052d0,0x0a9b8,0x0a950,0x0b4a0,0x0b6a6,0x0ad50,0x055a0,0x0aba4,0x0a5b0,0x052b0,//2070-20790x0b273,0x06930,0x07337,0x06aa0,0x0ad50,0x14b55,0x04b60,0x0a570,0x054e4,0x0d160,//2080-20890x0e968,0x0d520,0x0daa0,0x16aa6,0x056d0,0x04ae0,0x0a9d4,0x0a2d0,0x0d150,0x0f252,//2090-20990x0d520],//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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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 \u95f0return(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-1return( (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-1var ms = m-1;if(ms==1) { //2月份的闰平规律测算后确认返回28或29return(((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 => \u6708if(m>12 || m<1) {return -1} //若参数错误 返回-1var 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 => \u65e5var 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1900.1.31~2100.12.31y = 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+'-'+dvar lunarDate = year+'-'+month+'-'+dayvar festival = this.festivalvar lfestival = this.lfestivalvar festivalDate = m+'-'+dvar lunarFestivalDate = month+'-'+dayreturn {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1900.1.31~2100.12.1y = 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 methodif(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

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>

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 = resthis.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。