<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[hmh1203的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/hmh1203</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; hmh1203]]></copyright><item><title><![CDATA[JavaScript Difference Between null and undefined]]></title><link>https://blog.youkuaiyun.com/hmh1203/article/details/83709400</link><guid>https://blog.youkuaiyun.com/hmh1203/article/details/83709400</guid><author>hmh1203</author><pubDate>Wed, 15 Sep 2010 11:07:02 +0800</pubDate><description><![CDATA[In JavaScript, undefined means a variable has been declared but has not yet been assigned a value, such as:
var TestVar;
alert(TestVar); //shows undefined
alert(typeof TestVar); //shows undefined
...]]></description><category></category></item><item><title><![CDATA[Javascript闭包]]></title><link>https://blog.youkuaiyun.com/hmh1203/article/details/83709371</link><guid>https://blog.youkuaiyun.com/hmh1203/article/details/83709371</guid><author>hmh1203</author><pubDate>Wed, 15 Sep 2010 10:46:58 +0800</pubDate><description><![CDATA[一、什么是闭包？

　　“官方”的解释是：所谓“闭包”，指的是一个拥有许多变量和绑定了这些变量的环境的表达式（通常是一个函数），因而这些变量也是该表达式的一部分。
　　相信很少有人能直接看懂这句话，因为他描述的太学术。我想用如何在Javascript中创建一个闭包来告诉你什么是闭包，因为跳过闭包的创建过程直接理解闭包的定义是非常困难的。看下面这段代码：
function a(){
   ...]]></description><category></category></item><item><title><![CDATA[JSON及jQuery应用]]></title><link>https://blog.youkuaiyun.com/hmh1203/article/details/83709345</link><guid>https://blog.youkuaiyun.com/hmh1203/article/details/83709345</guid><author>hmh1203</author><pubDate>Wed, 15 Sep 2010 10:16:07 +0800</pubDate><description><![CDATA[转自：http://www.tinoweb.cn/2009/08/22/json_and_jquery/


JSON定义

JSON(JavaScript Object Notation) 
是一种轻量级的数据交换格式，易于阅读和编写，同时也易于机器解析和生成。它基于ECMA262语言规范（1999-12第三版）中JavaScript
 编程语言的一个子集。 JSON采用与编程语言无关...]]></description><category></category></item><item><title><![CDATA[uml]]></title><link>https://blog.youkuaiyun.com/hmh1203/article/details/83322831</link><guid>https://blog.youkuaiyun.com/hmh1203/article/details/83322831</guid><author>hmh1203</author><pubDate>Mon, 08 Dec 2008 09:56:58 +0800</pubDate><description><![CDATA[ 


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