Javascript Array contains(array)

Array.prototype.contains = function(array) {
  var arr1 = this.sort();
  var arr2 = array.sort();
  var i = arr1.length;
  if ( i < arr2.length ) {
    return false;
  }//from  w  w w.ja  va  2 s .  com
  while (i--) {
    if (arr1[i] === arr2[i]) {
      return true;
    }
  }
  return false;
};

Array.prototype.contains = function (e) {
    return this.indexOf(e) > -1;
};