title: Disable multiple options from dropdown list using javascript
body: <p>I have following options in dropdown list.</p>
  
  <pre><code>&lt;select&gt;
  
     &lt;option value="FRUIT"&gt;FRUIT&lt;/option&gt;
     &lt;option value="MANGO"&gt;MANGO&lt;/option&gt;
     &lt;option value="APPLE"&gt;APPLE&lt;/option&gt;
     &lt;option value="BANANA"&gt;BANANA&lt;/option&gt;
  
    &lt;option value="GRADES"&gt;GRADES&lt;/option&gt;
     &lt;option value="A"&gt;A&lt;/option&gt;
     &lt;option value="B"&gt;B&lt;/option&gt;
     &lt;option value="C"&gt;C&lt;/option&gt;
  
  &lt;/select&gt;
  </code></pre>
  
  <p>I want to disable(readonly) FRUIT and GRADES permanently. How can I achieve this result using javascript ?</p>