__block WKWebView *webView = [[WKWebView alloc] initWithframe:CGRectZero]; [webView evaluateJavascript:@"navigator.userAgent" completionHandler:^(NSString *result, NSError * error) { webView = nil; /// 延迟webview释放,否则无法获取result if (!error && result && [result isKindOfClass:[NSString class]]) { NSString *userAgent = result; } }];
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