Javascript Array every(callback, scope)

// Array.prototype.every
Array.prototype.every = function every(callback, scope) {
  for (var array = this, index = 0, length = array.length; index < length; ++index) {
    if (!callback.call(scope || window, array[index], index, array)) {
      break;//from  w w  w  .  j  a v a2s  .com
    }
  }

  return index === length;
};