* Returns a random element from the supplied arguments * or from the array (if single argument is an array).

* Similar to Array/forEach but works over object properties and fixes Don't * Enum bug on IE. * based on: http://whattheheadsaid.com/2010/10

* Check if value is from a specific "kind".

* Checks if the value is created by the `Object` constructor.

* 判断数据类型是否为Undefined * @param arg * @returns {boolean}

* Creates a typed array from a HEAP8 pointer.