title: How to add javascript value to an existing value of textbox
body: <p>i want to generate a 6 digits and add them to an existing text such as :</p>
  
  <p>this java script</p>
  
  <pre><code>&lt;script&gt;
  function myFunction() {
  var x = Math.floor((Math.random() * 10) + 1);
  document.getElementById("demo").innerHTML = x;
  }&lt;/script&gt;
  </code></pre>
  
  <p>it's output is random number ..</p>
  
  <p>i want to add it to the text below in value </p>
  
  <pre><code>&lt;input class="textbox"type="text" value="My Age is [ Here is The Output of the JavaScript] , am i old ?" &gt;
  </code></pre>
  
  <p>is it possible ?</p>