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HTML

<ul>
 <li><a href="https://teratail.com/questions/42302">JavaScript - 特定の配列を内包する配列を検知したい(42302)｜teratail</a></li>
</ul>

JavaScript

'use strict';
function arrayIn (array, innerArray) {
  return array.reduce(function (previous, current) {
    var i = previous.indexOf(current);

    if (i !== -1) {
      previous.splice(i, 1);
    }

    return previous;
  }, [].concat(innerArray)).length === 0;
}

console.log(arrayIn([1, 1, 3, 4, 5], [1, 2]));  // false
console.log(arrayIn([1, 3, 4, 5], [1, 1]));     // false
console.log(arrayIn([1, 3, 4, 2], [1, 2]));     // true
console.log(arrayIn([1, 2, 3, 4, 5], [1, 2]));  // true