慎用html5applicationcache

1. Do not use appcache unless it is REALLY 100% EXACTLY WHAT YOU WANT TO DO
2. 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.
3. 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.
4. Don't turn it on again until it's 100% CORRECT
5. Dealing with appcache is miserable, often.

解决办法很简单，在服务器端删除掉manifest文件，并且慎用application cache

当然，也有办法是用application cache，同时能绕过自动缓存当前页面的问题。那就是用iframe：http://sofish.de/1449

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