How to disable select?

Question

JavaScript

How to disable the other when changing the value in one select?
For example, so that when the third item is selected in the first select, the neighboring select is not available at all, and if you change it to two or one, everything turns back on.
https://codepen.io/oldschool1705/pen/pojKMBg

Answer 1

<select onchange="checkValue(this.value)">
  <option> Один</option>
  <option> два</option>
  <option> три</option>
  </select>
<select id="abc">
  <option> выкл</option>
  <option> выкл</option>
  <option> выкл</option>
</select>

const checkValue = val => {
    document.getElementById('abc').disabled = val === 'три';
}