disabled in javascript code example

Example 1: howt to disable a select tag using js

document.getElementById("one").onchange = function () {
  document.getElementById("two").setAttribute("disabled", "disabled");
  if (this.value == 'car')
    document.getElementById("two").removeAttribute("disabled");
};

Example 2: how to disable javascript

<noscript>
  Javascript is disable in your browser
</noscript>