关闭电源后，HTML5 LocalStorage在iOS上不持久 [英] HTML5 LocalStorage not persistent on iOS after Power Off

问题描述

我正在开发一个需要离线数据库存储的iPad（3G）网络应用程序。

I'm developing a web app for iPad (3G) that requires offline database storage.

起初我尝试使用HTML5的LocalStorage API。在测试时，我了解到如果我离开页面并关闭设备（iPad和iPhone），当我稍后重新打开页面时，我的数据无法通过LocalStorage访问（数据库似乎丢失了）。

At first I tried using HTML5's LocalStorage API. When testing, I learned that if I navigate away from the page and power off the device (both iPad and iPhone), when I reopen the page later, my data cannot be accessed via LocalStorage (database appears to be missing).

我在 http：//上看到此行为使用iOS设备的diveintohtml5.ep.io/examples/localstorage-halma.html ，但Android设备（Droid X和Galaxy）和运行WinXP + Safari的PC会在重启时保持我的数据。

I see this behavior at http://diveintohtml5.ep.io/examples/localstorage-halma.html with iOS devices, but Android devices (Droid X and Galaxy) and a PC running WinXP + Safari maintain my data across a restart.

我使用Webkit自己的客户端数据库存储在iOS设备上获得了适当的行为，就像这里可以看到的那样： http://blog.darkcrimson.com/2010/05/local-databases/ 。

I get appropriate behavior on the iOS devices using Webkit's own "client-side database storage", like what can be seen here: http://blog.darkcrimson.com/2010/05/local-databases/.

有没有人在LocalStorage中看到过这个问题？
有谁知道为什么数据库不会在iOS设备上维护？
有没有人有解决方案？

Has anyone seen this problem with LocalStorage? Does anyone know why the database wouldn't be maintained on iOS devices? Does anyone have a solution?

推荐答案

问题似乎与iOS版本有关。
我在iPad上使用v4.3时出现此问题，在iPhone上使用v4.3.1。 iPad上的
v4.2.1工作得很好。 iPad上的
v4.3.2将在断电时保持数据，但不用于清除缓存。
我希望这有助于其他人。

The problem seems to be with the version of iOS. I had this issues with v4.3 on an iPad, and v4.3.1 on an iPhone. v4.2.1 on an iPad works just fine. v4.3.2 on an iPad will maintain the data across power-off, but NOT for clearing the cache. I hope this helps someone else.

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