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#Four Ways To Do Pub/Sub With jQuery and jQuery UI (in the future)

Between jQuery 1.7 and some of work going into future versions of jQuery UI, there are a ton of hot new ways for you to get your publish/subscribe on. Here are just four of them, three of which are new.

(PS: If you're unfamiliar with pub/sub, read the guide to it that Julian Aubourg and I wrote here http://msdn.microsoft.com/en-us/scriptjunkie/hh201955.aspx)

##Option 1: Using jQuery 1.7's $.Callbacks() feature:

$.Callbacks are a multi-purpose callbacks list object which can be used as a base layer to build new functionality including simple publish/subscribe systems. We haven't yet released the API documentation for this feature just yet, but for more information on it (including lots of examples), see my post on $.Callbacks() here:

	/*!
	* jQuery Tiny Pub/Sub - v0.6 - 1/10/2011
	* http://benalman.com/ see https://gist.github.com/661855
	*
	* Copyright (c) 2010 "Cowboy" Ben Alman
	* Dual licensed under the MIT and GPL licenses.
	* http://benalman.com/about/license/
	*
	* (removed pre 1.4.3 support, added $.pubsubdebug())
	*/

	<?php
	//检测字符串是否是utf-8编码
	if(mb_detect_encoding($content,"UTF-8, ISO-8859-1, GBK, gb2312") !== 'UTF-8')
	{
	$content = iconv("gbk","utf-8",$content);
	}
	//转换文件为utf-8编码的文件,如果该文件开始即为utf-8，则不会做任何处理
	enca -L zh_CN -x UTF-8 $script_dir/../upload/text/$1.txt

	<?php
	//仅仅试用于linux/mac环境
	function command_exist($cmd)
	{
	$returnVal = shell_exec("which $cmd");
	return (empty($returnVal) ? false : true);
	}

	<?php

	$node_arr = array();
	//记录每个单词首次出现的位置
	$word_position = array();
	/**
	* 查找当前节点大夫节点
	*/
	function find($node)
	{

	shell判断文件,目录是否存在或者具有权限
	#!/bin/sh

	Path="/var/log/httpd/"
	File="/var/log/httpd/access.log"

	#这里的-x 参数判断$Path是否存在并且是否具有可执行权限
	if [ ! -x "$Path"]; then
	mkdir "$Path"
	fi

	1. if (typeOf(x) === 'undefined')
	2. if (typeOf(x) !== 'object')
	3. if (!x)

	function letNodeCenter(selector) {
	var _top = ($(window).height() - $(selector).heigh())/2,
	_left = ($(window).height() = $(selector).height())/2,
	_scrollTop = $(document).scrollTop(),
	_scrollLeft = $(document).scrollLeft();

	$(selector).css({position: 'absolute', top: top + scrollTop, left: left + scrollLeft }).show()
	}

	var objDiv = document.getElementById("div");
	objDiv.scrollTop = objDiv.scrollHeight;