jQuery是一个出色的javascript框架，所有的声明 实现位于一个文件里面，语法非常晦涩难懂，譬如下面

(function(){

var

// Will speed up references to window, and allows munging its name.

window = this,

// Will speed up references to undefined, and allows munging its name.

undefined,

// Map over jQuery in case of overwrite

_jQuery = window.jQuery,

// Map over the $ in case of overwrite

_$ = window.$,

jQuery = window.jQuery = window.$ = function( selector, context ) {

// The jQuery object is actually just the init constructor ‘enhanced’

return new jQuery.fn.init( selector, context );

},

// A simple way to check for HTML strings or ID strings

// (both of which we optimize for)

quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,

// Is it a simple selector

isSimple = /^.[^:#\[\.,]*$/;

jQuery.fn = jQuery.prototype = {

init: function( selector, context ) {

首先(function(){…})应该是一个匿名的javascript类，将所有的变量，函数声明封装起来，不至于暴露到全局的naming space中去， 然后声明了一些变量 并赋给window，再重新暴露出去，以便外部接口使用，譬如window.$,这是function(selector, context )的缩写，这些语法普通的javascript教程似乎都不怎么提及，这让我想起另外一个暴露接口的方法，也让人迷惑不解，

window['MGJS_CMT'] = {};
window['MGJS_CMT']['reply'] = reply;
window['MGJS_CMT']['quote'] = quote;