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<html>
<head>
<script src="http://www.sargonco.com/Uploads/Public/article/webdistut/javascript/jquery-3.2.1.min.js"></script>
<script>
$(document).ready(function(){
    $("#btn1").click(function(){
        $("p").append(" <b>Appended text</b>.");
    });

    $("#btn2").click(function(){
        $("ol").append("<li>Appended item</li>");
    });
});
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<body>

<p>This is a paragraph.</p>
<p>This is another paragraph.</p>

<ol>
  <li>List item 1</li>
  <li>List item 2</li>
  <li>List item 3</li>
</ol>

<button id="btn1">Append text</button>
<button id="btn2">Append list items</button>

</body>
</html>

This is a paragraph.

This is another paragraph.

  1. List item 1
  2. List item 2
  3. List item 3