- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)req navigationType:(UIWebViewNavigationType)Type { NSString *url = [[req URL] absoluteString]; NSString *userAgent = [url rangeOfString:@"yahoo.com"].location != NSNotFound ? @"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7" : mUserAgent; NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:userAgent, @"UserAgent", nil]; [[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];返回是; }