The second storage mechanism (note: localStorage) is designed for storage that spans multiple windows,and lasts beyond the current session. In particular,Web applications may wish to store megabytes of user data,such as entire user-authored documents or a user’s mailBox,on the client side for performance reasons.

在Apple页面上：

Safari supports the latest HTML5 offline data storage features. Your application can store its information on the local machine using either a simple key/value-based data store,or a robust sql database. The data is stored locally and persists across launches of Safari so your application doesn’t need a network connection to access the data,improving startup time and overall performance.

搜索谷歌(和雅虎,因为一些反谷歌的怪胎)给了我：

In iOS 5.1 Apple have moved the location of localStorage files into a Caches folder which is subject to occasional clean up,at the behest of the OS,typically if space is short. It is likely that Apple have done this to stop localStorage being backed up to iCloud.

localStorage not accessible in IOS-6 Safari

I am not able to access localStorage in Safari (IPad with IOS-6).
For example,the following code is working fine in Windows on all browsers and on (iPad with iOS-5) but not in iOS-6:
localStorage.setItem(“var”,”5″);
alert(localStorage.getItem(“var”));

回答：

I was able to fix the issue by turning off private browsing on the iPad. I came across the solution from the reference : 07001