<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.qrcode.min.js"></script>

<div class="modal-body" id="qrCode" style="left:40px">
 
 </div>

var str = "http://" + location.host + "/ActivityDetail.html?id=" + row.ActivityGuid + "&isMail=" + row.isMail + "";
$("#qrCode").empty();
 
$('#qrCode').qrcode(str);
 
//$('#qrCode').qrcode("http://www.1sucai.cn");//任意字符串

function toUtf8(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;  
}

var str = toUtf8("2017鸡年大吉！");
$('#qrCode').qrcode(str);