<script src="https://cdn.jsdelivr.net/npm/qrcanvas@3"></script>
<!DOCTYPE html>
<html>
<head>
<title>QRCanvas Demo</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no" />
<script src="./qrcanvas.js"></script>
</head>
<body>
<div id="qrcode"></div>
</body>
<script>
const canvas = qrcanvas.qrcanvas({
data: ‘hello, world‘ // 内容
});
document.getElementById(‘qrcode‘).appendChild(canvas);
</script>
</html>
原文：https://www.cnblogs.com/shizi1987/p/12360060.html