test006.js

// strict check
//

function strict () {
  'use strict';
  var isStrict = (function () { return typeof this === 'undefined'; }());
  console.log(isStrict);
}

function nonStrict () {
  var isStrict = (function () { return typeof this === 'undefined'; }());
  console.log(isStrict);
}

strict();
nonStrict();