Javascript Array includes(array)

Array.prototype.includes = function(array) {
  for ( var i = 0; i < this.length; i++) {
    for ( var k = 0; k < array.length; k++) {
      if ( this[i] == array[k]) {
        return true;
      }//from w  ww  .j  a v a  2  s .c  om
    }
  }
  return false;
};