qrcode

HTML

<script src="https://raw.github.com/jeromeetienne/jquery-qrcode/master/jquery.qrcode.min.js"></script>
<div id="qr"></div>
<textarea id="encode-text"></textarea>
<button id="qr-btn">qrcode</button>
<button id="reset">reset</button>

JavaScript

$(function(){
  $("#qr-btn").on("click",function(){
   $("#qr").qrcode($("#encode-text").val());
  });
    $("#reset").on("click",function(){
        $("#encode-text").val("");
    });
});