文本框中的回车处理 js

  <input id="txtOrderID" onkeypress="getKey(event)" />
    <button onclick="refund()">提交</button>
    <script src="https://cdn.bootcss.com/jquery/1.8.3/jquery.js"></script>
    <script>
        function getKey(event) {
            if (event.keyCode == ) {
                refund();
            }
        }
    </script>