<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="jquery3.4.1.min.js"></script>
<script src="jquery.qrcode.min.js"></script>
</head>
<body>
<div id="qrcodeCanvas"></div>
</body>
<script>
$('#qrcodeCanvas').qrcode({
width : 300,
height : 300,
text : "写你的网址"
});
</script>
</html>
需要引入两个东西