今天老板提了需求，要在服务端生成邀请卡，嗯…，简单的说就是把要这张：
变成差多这样的：
后端搞ruby的哥们搞了个html转图片，说转得太慢了，我就把这坑接下来了
所以睡前就倒腾了下，搞了个简单的实现
解决思路
文字转svg -> svg转png -> 合并图片
相关轮子
- images Node.js 轻量级跨平台图像编解码库，不需要额外安装依赖
- text-to-svg 文字转svg
- svg2png svg转png图片
示例代码
'use strict';const fs = require('fs');const images = require('images');const TextToSVG = require('text-to-svg');const svg2png = require("svg2png");const Promise = require('bluebird');Promise.promisifyAll(fs);const textToSVG = TextToSVG.loadSync('fonts/文泉驿微米黑.ttf');const sourceImg = images('./i/webwxgetmsgimg.webp');const sWidth = sourceImg.width();const sHeight = sourceImg.height();const svg1 = textToSVG.getSVG('魏长青-人人讲App', { x: 0, y: 0, fontSize: 24, anchor: 'top',});const svg2 = textToSVG.getSVG('邀请您参加', { x: 0, y: 0, fontSize: 16, anchor: 'top',});const svg3 = textToSVG.getSVG('人人讲课程', { x: 0, y: 0, fontSize: 32, anchor: 'top',});Promise.coroutine(function* generateInvitationCard() { const targetImg1Path = './i/1.webp'; const targetImg2Path = './i/2.webp'; const targetImg3Path = './i/3.webp'; const targetImg4Path = './i/qrcode.webp'; const [buffer1, buffer2, buffer3] = yield Promise.all([ svg2png(svg1), svg2png(svg2), svg2png(svg3), ]); yield Promise.all([ fs.writeFileAsync(targetImg1Path, buffer1), fs.writeFileAsync(targetImg2Path, buffer2), fs.writeFileAsync(targetImg3Path, buffer3), ]); const target1Img = images(targetImg1Path); const t1Width = target1Img.width(); const t1Height = target1Img.height(); const offsetX1 = (sWidth - t1Width) / 2; const offsetY1 = 200; const target2Img = images(targetImg2Path); const t2Width = target2Img.width(); const t2Height = target2Img.height(); const offsetX2 = (sWidth - t2Width) / 2; const offsetY2 = 240; const target3Img = images(targetImg3Path); const t3Width = target3Img.width(); const t3Height = target3Img.height(); const offsetX3 = (sWidth - t3Width) / 2; const offsetY3 = 270; const target4Img = images(targetImg4Path); const t4Width = target4Img.width(); const t4Height = target4Img.height(); const offsetX4 = (sWidth - t4Width) / 2; const offsetY4 = 400; images(sourceImg) .draw(target1Img, offsetX1, offsetY1) .draw(target2Img, offsetX2, offsetY2) .draw(target3Img, offsetX3, offsetY3) .draw(target4Img, offsetX4, offsetY4) .save('./i/card.webp', { quality : 90 });})().catch(e => console.error(e));注意事项
text-to-svg需要中文字体的支持，不然中文会乱码
在我的破电脑上执行一次只花了500多毫秒，感觉足够了，分享出来希望能给大家一个参照
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
