how to sort column name in ascending order when button is click?

<button onclick="sortTable()">sort</button>
            <table>
              <tbody id="myTable">
                <tr>
                  <th>Name</th>
                  <th>Country</th>
                </tr>
                <tr>
                  <td>Alfreds FutterKiste</td>
                  <td>Germany</td>
                </tr>
                <tr>
                  <td>Berglunds snabbkop</td>
                  <td>Sweden</td>
                </tr>
                <tr>
                  <td>Island</td>
                  <td>Trading</td>
                </tr>
              </tbody>
            </table>

            <script>

              function sortTable() {

              }
            </script>