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<div id="article_ajax_content"><h2 style='text-align:center;margin-bottom:10px'>周记【学校晚会篇】</h2><p> 在这一周里我们13届的新生度过了在联合技校的第一个晚会，虽然我觉得这个晚会我觉得有点无聊，但是我觉得还是有点意思，怎么说都是我们的第一个晚会，总比在班上晚修爽多了。【哈哈哈哈啊哈哈哈哈哈】</p></div><div id='article_list'><div id='article_list_title'>姚嘉豪</div><div id='article_list_content'><ul><li><a href='uedu_13ZJ3142-article-001.html'>1.【我期待的技校生活】</a><span class='time'>2013-09-08</span></li><li><a href='uedu_13ZJ3142-article-002.html'>2.周记1</a><span class='time'>2013-09-10</span></li><li><a href='uedu_13ZJ3142-article-003.html'>3.一件有意义的事</a><span class='time'>2013-10-05</span></li><li><a href='uedu_13ZJ3142-article-004.html'>4.周记</a><span class='time'>2013-10-13</span></li><li><a href='uedu_13ZJ3142-article-011.html'>5.寒假作业（鲁滨孙漂流记读后感）</a><span class='time'>2014-02-15</span></li><li><a href='uedu_13ZJ3142-article-005.html'>6.周记【学校晚会篇】</a><span class='time'>2013-10-20</span></li><li><a href='uedu_13ZJ3142-article-006.html'>7.读后感想</a><span class='time'>2013-10-27</span></li><li><a href='uedu_13ZJ3142-article-007.html'>8.第八周记</a><span class='time'>2013-11-03</span></li><li><a href='uedu_13ZJ3142-article-008.html'>9.第九周记</a><span class='time'>2013-11-10</span></li><li><a href='uedu_13ZJ3142-article-009.html'>10.第10周记</a><span class='time'>2013-11-17</span></li></ul><p style='clear:both'></p></div><div class='page_bar'><ul><li><a href='uedu_13ZJ3142-article-p1.html'>1</a></li><li><a href='uedu_13ZJ3142-article-p2.html'>2</a></li></ul><p style='clear:both'></p></div></div><div id='works_list'><div id='works_list_title'>个人作品</div><div id='works_list_content'><ul><li><a href='uedu_13ZJ3142-works-001.html'>1.姚嘉豪-自我介绍</a><span class='time'>2013-11-16</span></li><li><a href='uedu_13ZJ3142-works-002.html'>2.现代人</a><span class='time'>2013-11-21</span></li></ul><p style='clear:both'></p></div><div class='page_bar'><ul></ul><p style='clear:both'></p></div></div><div id="link_wish_wall"><a href="http://www.school003.com/article/wishWall.html"><p style="font-size:1.4em;text-align:center">许愿墙</p><p>1. wwwwwwwwwwwwwwwwww... 2014-09-18</p><p>2. 11111111111111... 2014-08-10</p><p>3. 好烦啊！感觉有好多... 2014-02-20</p></a></div><div id="article_comment"><p>留言板</p><div id="article_comment_content"></div><div id="article_comment_bottom"><p><textarea name="textarea" cols="40" rows="2" id="article_comment_textarea" style="resize:none"></textarea></p><p id="article_comment_bottom_bar"><span id="article_comment_submit">发表</span><span id="article_comment_err"></span></p></div></div><div style="clear:right;float:right;width:400px;height:60px;line-height:60px;margin-bottom:10px;border-radius: 10px;box-shadow:1px 1px 7px #222;background: #37291C;text-align:center;"><p><a href="grade/" target="_blank" style="font-size:24px;color:#fff;text-decoration:none;">查看考试成绩</a><p></div><p style="clear:both"></p>
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http://www.school003.com/special/uedu_13ZJ3142-article-005.html
http://blog.csdn.net/my_yang/article/details/7412588
在访问现在很火的google plus时，细心的用户也许会发现页面之间的点击是通过ajax异步请求的，同时页面的URL发生了了改变。并且能够很好的支持浏览器的前进和后退。不禁让人想问，是什么有这么强大的功能呢？
HTML5里引用了新的API，就是history.pushState和history.replaceState，就是通过这个接口做到无刷新改变页面URL的。
与传统的AJAX的区别
传统的ajax有如下的问题：
虽然ajax可以无刷新改变页面内容，但无法改变页面URL
其次为了更好的可访问性，内容发生改变后，改变URL的hash。但是hash的方式不能很好的处理浏览器的前进、后退等问题
有的浏览器引入了onhashchange的接口，不支持的浏览器只能定时去判断hash是否改变
再有，ajax的使用对搜索引擎很不友好，往往蜘蛛爬到的区域是空的
为了解决传统ajax带来的问题，HTML5里引入了新的API，即：history.pushState, history.replaceState
可以通过pushState和replaceState接口操作浏览器历史，并且改变当前页面的URL。
pushState是将指定的URL添加到浏览器历史里，replaceState是将指定的URL替换当前的URL。
如何调用
var state = {
title: title,
url: options.url,
otherkey: othervalue
};
window.history.pushState(state, document.title, url);
state对象除了要title和url之外，也可以添加其他的数据，比如：还想将一些发送ajax的配置给保存起来。
replaceState和pushState是相似的，不需要多做解释。
如何响应浏览器的前进、后退操作
window对象上提供了onpopstate事件，上面传递的state对象会成为event的子对象，这样就可以拿到存储的title和URL了。
window.addEventListener('popstate', function(e){
if (history.state){
var state = e.state;
//do something(state.url, state.title);
}
}, false);
这样就可以结合ajax和pushState完美的进行无刷新浏览了。
一些限制
1、无法跨域，这个是必然的。引用曾经在网上看到的一句经典的话：“如果javascript可以跨域的话，那他就可以逆天了！”
2、state对象虽然可以存储很多自定义的属性，但值不能是个对象。
对应后端的一些处理
这种模式下除了当前使用ajax可以无刷新浏览外，还要保证直接请求改变的URL后也可以正常浏览，所以后端要对这些处理下。
1、对结合pushState的ajax可以发送一个特殊的头，如： setRequestHeader(‘PJAX’, ‘true’)。
2、后端获取到有PJAX=true的header时，将页面中通用的部分都不输出。比如：PHP可以通过下面的判断
function is_pjax(){
return array_key_exists('HTTP_X_PJAX', $_SERVER) && $_SERVER['HTTP_X_PJAX'] === 'true';
}
虽然接口上只有pushState、replaceState、onpopstate，但在使用的时候还是要做很多处理的。