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