javascript - Disable certain options in a drop down select -


need disable option "5" & "6" when option value "2" selected. should display options in list_2 when option "1" selected. how can using jquery or other method. 

if ($('option[value=2]').prop('selected', true)) {        $('option[value=5]').prop('disabled', true);      }
<html>      <body>          <select id= "list_1">        <option value="1">option 1</option>        <option value="2">option 2</option>            </select>        <select id= "list_2">        <option value="4">option 4</option>        <option value="5">option 5</option>        <option value="6">option 6</option>      </select>    </body>  </html>

with plain js:

document.getelementbyid('list_1').onchange = function() {      document.getelementbyid('list_2')[1].disabled = (document.getelementbyid('list_1').selectedindex == 1);    document.getelementbyid('list_2')[2].disabled = (document.getelementbyid('list_1').selectedindex == 1);  }
<select id="list_1">    <option value="1">option 1</option>    <option value="2">option 2</option>    </select>    <select id="list_2">    <option value="4">option 4</option>    <option value="5">option 5</option>    <option value="6">option 6</option>  </select>


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