转自cloud.tencent.com/developer/article/1068483
只贴快速使用的片段了
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="//cdn.bootcss.com/jquery/1.8.2/jquery.min.js"></script>
<script src="//cdn.bootcss.com/jquery.qrcode/1.0/jquery.qrcode.min.js"></script>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="output"></div>
<script type="text/javascript">
function utf16to8(str) {
var out, i, len, c;
out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
content = utf16to8('手机扫一扫，精彩随声带！');
$('#output').qrcode({
200,
height: 200,
render: "canvas",
correctLevel: 0,
text: content
});
</script>
</div>
</form>
</body>
</html>