<div id="qrcode"></div>
<a id="download" download="qrcode.jpg"></a>
<button id="save">save</button>
<script src="jquery.min.js"></script>
<script src="jquery.qrcode.min.js"></script>
<script>
jQuery('#qrcode').qrcode({ width: 75, height: 75, text: window.location.href });
$("#save").click(function () {
var canvas = $('#qrcode').find("canvas").get(0);
var url = canvas.toDataURL('image/jpeg');
$("#download").attr('href', url).get(0).click();
return false;
});
</script>
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