typeof and instanceof

	普通方式创建	typeof	instanceof	new方式创建	typeof	instanceof
Object	var o={};	object	Object	var o=new Object();	object	Object
Array	var a=[];	object	Array	var a=new Array();	object	Array
Function	var f = function(){};	function	Function	var f = new Function();	function	Function
String	var s="hello,world";	string		var s=new String("hello,world");	object	String
Number	var n =5;	number		var n =new Number(5);	object	Number
Boolean	var b=true;	boolean		var b=new Boolean(true);	object	Boolean
null	var nl= null;	object
undefined	var un=undefined;	undefined
*1."typeof operator returns a string indicating the type of the unevaluated operand." ---from MDC
*2."obj instanceof ConstructorFunction works by checking if ConstructorFunction.prototype is in the prototype chain of obj. "----from MDC