console.log('typeof of 10 ~~~~' +typeof 10);
console.log('typeof of "a" ~~~~' +typeof 'a');
console.log('typeof of true ~~~~' +typeof true);
console.log('typeof of {} ~~~~' +typeof {});
console.log('typeof of /123/ ~~~~' +typeof /123/);
console.log('typeof of function(){} ~~~~' +typeof function(){});
console.log('typeof of undefined ~~~~' +typeof undefined);
console.log('typeof of null ~~~~' +typeof null);

("10x" - 0) == ("10x" - 0);
 // 结果为假! 

// 先申明一个对象,目的是用来做映射
var class2type = {};
// 申明一个core_toString() 的方法,得到最原始的toString() 方法,因为在很多对象中,toStrintg() 已经被重写 
var core_toString() = class2type.toString;

// 这里为 toStrintg() 后的结果和类型名做一个映射,申明一个core_toString() 后的结果,而值就是类型名
jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
 class2type[ "[object " + name + "]" ] = name.toLowerCase();
});

var core_toString = {}.toString;
console.log( core_toString.call(1) );
console.log( core_toString.call("11") );
console.log( core_toString.call(/123/) );
console.log( core_toString.call({}) );
console.log( core_toString.call(function(){}) );
console.log( core_toString.call([]) );
console.log( core_toString.call(true) );
console.log( core_toString.call(new Date()) );
console.log( core_toString.call(new Error() ));
console.log( core_toString.call(null) );
console.log( core_toString.call(undefined) );
console.log( String(null) );
console.log( String(undefined) );

class2type[ "[object " + name + "]" ] = name.toLowerCase();

type: function( obj ) {
 if ( obj == null ) {
 return String( obj );
 }
 // Support: Safari <= 5.1 (functionish RegExp)
 return typeof obj === "object" || typeof obj === "function" ?
 class2type[ core_toString.call(obj) ] || "object" :
 typeof obj;
},

console.log(core_toString.call(null));
console.log(core_toString.call(undefined));

typeof obj === "object" || typeof obj === "function" ?
 class2type[ core_toString.call(obj) ]

class2type[ core_toString.call(obj) ] || "object" :
// 这是防止一些未知情况的,如果未取到,就返回object

function Person(){
 this.name = 'pawn';
}
var p = Person.toString();

function Person(){
 this.name = 'pawn';
 }
 console.log(Person.prototype.constructor === Person);

function Person(){
 this.name = 'pawn';
 }
 Person.protype = {
 XX: ... ,
 xx: ... ,
 ...
 }

Person.protype = {
 construction: Person,
 XX: ... ,
 xx: ... ,
 ...
 }

jQuery.fn = jQuery.prototype = {
 constructor: jQuery,
 init: function( selector, context, rootjQuery ) {
 var match, elem;

var getType = function(obj){
 if(obj == null){
 return String(obj);
 }
 if(typeof obj === 'object' || typeof obj === 'fucntion'){
 ...
 }else{
 // 如果不是引用类型,那么就是基本类型
 return typeof obj
 }
 }

function Person(){
 this.name = 'pawn';
 }
 var p = new Person();
 console.log(p.constructor);

var regex = /function\s(.+?)\(/

function Person(){
 this.name = 'pawn';
 }
 var p = new Person();
 var c = p.constructor
 var regex = /function\s(.+?)\(/;
 console.log('|' + regex.exec(c)[1] + '|');

var getType = function(obj){
 if(obj == null){
 return String(obj);
 }
 if(typeof obj === 'object' || typeof obj === 'function'){ 
 var constructor = obj.constructor;
 if(constructor && constructor.name){
 return constructor.name;
 }
 var regex = /function\s(.+?)\(/;
 return regex.exec(c)[1];
 }else{
 // 如果不是引用类型,那么就是基本;类型
 return typeof obj;
 }
};

var getType = function(obj){
 if(obj == null){
 return String(obj);
 }
 if(typeof obj === 'object' || typeof obj === 'function'){ 
 return obj.constructor && obj.constructor.name.toLowerCase() || 
 /function\s(.+?)\(/.exec(obj.constructor)[1].toLowerCase();
 }else{
 // 如果不是引用类型,那么就是基本类型
 return typeof obj;
 }
};

var getType = function(obj){
 if(obj == null){
 return String(obj);
 }
 return typeof obj === 'object' || typeof obj === 'function' ?
 obj.constructor && obj.constructor.name && obj.constructor.name.toLowerCase() ||
 /function\s(.+?)\(/.exec(obj.constructor)[1].toLowerCase():
 typeof obj;
};

function Person(){
 this.name = 'pawn';
}
var p = new Person();

console.log(getType(p));
console.log(getType(1));
console.log(getType("a"));
console.log(getType(false));
console.log(getType(/123/));
console.log(getType({}));
console.log(getType(function(){}));
console.log(getType(new Date()));
console.log(getType(new Error()));
console.log(getType( null));
console.log(getType( undefined));