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//清除cookies
NSHTTPCookie *cookie;
NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (cookie in [storage cookies])
{
[storage deleteCookie:cookie];
}
UIWebView清除缓存：
//清除UIWebView的缓存 [[NSURLCachesharedURLCache] removeAllCachedResponses];
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原文地址：http://www.cnblogs.com/Keys/p/4647687.html
