qrjs

A wrapper for qr.js.

installation

npm install @jswork/qrjs

usage

import qrcode, { ErrorCorrectLevel, QRCode } from '@jswork/qrjs';

const qr = qrcode('afei', {
  errorCorrectLevel: ErrorCorrectLevel.H,
  typeNumber: -1,
});

with canvas

yarn add canvas

import { ErrorCorrectLevel, QRCode } from '@jswork/qrjs';
import { createCanvas } from "canvas";
import fs from "fs";

// 生成二维码
const qrcode = new QRCode(-1, ErrorCorrectLevel.H);
qrcode.addData("afei");
qrcode.make();

// 获取二维码模块的大小和数据
const size = qrcode.getModuleCount();
const cellSize = 10; // 每个模块的大小，调整这个值可以改变二维码的尺寸
const margin = 4 * cellSize; // 留白的大小

// 创建Canvas
const canvas = createCanvas(
  size * cellSize + margin * 2,
  size * cellSize + margin * 2
);
const ctx = canvas.getContext("2d");

// 绘制二维码背景
ctx.fillStyle = "#ffffff";
ctx.fillRect(0, 0, canvas.width, canvas.height);

// 绘制二维码
ctx.fillStyle = "#000000";
for (let row = 0; row < size; row++) {
  for (let col = 0; col < size; col++) {
    if (qrcode.isDark(row, col)) {
      ctx.fillRect(
        margin + col * cellSize,
        margin + row * cellSize,
        cellSize,
        cellSize
      );
    }
  }
}

// 保存为PNG文件
const out = fs.createWriteStream("qrcode.png");
const stream = canvas.createPNGStream();
stream.pipe(out);
out.on("finish", () => console.log("QR code PNG file generated: qrcode.png"));

license

Code released under the MIT license.