“程”风破浪的开发者｜微信小程序生成海报图片导出相册
作者：清风无影
- 2022-10-28 北京
本文字数：17195 字
阅读完需：约 56 分钟
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、先睹为快
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
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Step2.JSON 组件声明
{ "usingComponents": { "wxml-to-canvas": "wxml-to-canvas", }}
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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}
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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 -->
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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) {} }) } }) },})
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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
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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>
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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 }) }) }})
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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。
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发布于: 刚刚阅读数: 3
版权声明: 本文为 InfoQ 作者【清风无影】的原创文章。
原文链接:【http://xie.infoq.cn/article/36f59b2536ac8e8a5102b6d2b】。未经作者许可，禁止转载。
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