在我們的3G版網站的項目中使用了html5 application cache，將大部分圖片資源、js、css等靜態(tài)資源放在manifest文件中。

沒想到上線第一天就遇到了嚴重問題：application cache會默認緩存當前頁面?。?！就算我們有如下設置：

代碼如下:

NETWORK:*

也就是說，對于所有的動態(tài)頁面，application cache會緩存起來，用戶怎么刷新都是老的！

而且手機瀏覽器還很難清除掉，也不支持js清除！

花了一個上午，嘗試了很多辦法，查了很多資料，都沒能清除掉客戶端的緩存。一上午被用戶投訴慘了。

最后還是萬能的stackoverflow救了我：

Do not use appcache unless it is REALLY 100% EXACTLY WHAT YOU WANT TO DO

Even if it IS 100% EXACTLY WHAT YOU WANT TO DO, *DO NOT* use appcache until you are 100% CERTAIN that you are not going to make a single change to that page (or any file that it links to) for a LONG time.

Delete the manifest file from the server -- if the browser can't find the manifest file, then it will clear its cache... ...this will also turn caching off for everyone.

Don't turn it on again until it's 100% CORRECT

Dealing with appcache is miserable, often.

解決辦法很簡單，在服務器端刪除掉manifest文件，并且慎用application cache

當然，也有辦法是用application cache，同時能繞過自動緩存當前頁面的問題。那就是用iframe