改變＃不會導致頁面重新加載，但是會改變瀏覽器歷史記錄

關於這點很容易測試，假設當前訪問的頁面是http://www.qq.com，打開控制臺，分別輸入如下命令看下區別（是否刷新），然後，再查看window.history有什麽區別（歷史記錄是否變化）

location.href += ‘#caper‘;  //頁面不會刷新
location.href += ‘?visitor=caper‘;  //頁面刷新

在普通的網頁瀏覽中，我們每點擊一個網頁鏈接，就會在瀏覽器歷史記錄中新增一條瀏覽記錄，並通過瀏覽器的導航功能輕松進行‘上一步‘、‘下一步‘的操作。

但對於ajax應用，url通常是不會變化的，尤其是單頁面應用。這也就意味著，用戶習以為常的瀏覽器導航功能（上一步、下一步）失去了作用，這在體驗上是比較糟糕的。通過＃，開發者可以利用不同的id，標識當前頁面所處狀態，提升用戶體驗。

5、JS中可以通過window.location.hash來讀取或改變＃的值

沒什麽好講的，可結上一點簡單測試下 :)

6、谷歌的網絡蜘蛛默認會忽略＃後面的內容

谷歌網絡蜘蛛負責爬取網頁的內容，以及網頁裏面的鏈接，它們會成為google搜索索引的一部分。網絡蜘蛛會抓取並分析HTML，但由於它並不是瀏覽器程序，也沒有javascript引擎，頁面上用來加載顯示內容的javascript並不會被執行。因此，＃後面的字符會被網絡蜘蛛忽視，只抓取＃前面的內容，舉例：

鏈接一：http://www.cnblogs.com/#casper
鏈接二：http://www.cnblogs.com/#chyingp
 

對於網絡蜘蛛來說，鏈接一、鏈接二其實是一樣的，它只會抓取http://www.cnblogs.com的內容，盡管兩個鏈接可能展示的是不同的內容

這點無論對於開發者，還是搜索引擎都是不利的，前者辛苦創作的內容(應用)少了很多被訪問的機會，而後者則失去了進一步豐富其內容索引的機會，特別是在ajax應用越來越多的今天。

為了解決這個問題，google提供了一個解決方案：hash bang，只要將＃改成#!即可，實現大致為：當網絡蜘蛛遇到#!時候，會自動將#!identifier轉成_escaped_fragment_=identifier形式的參數，修改下之前的鏈接

http://tieba.baidu.com/p/5632998173
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從QQ密碼修改的小問題回顧下URL Fragment