iOS WKWebview需要去掉UA中“ OS”
[webView evaluateJavaScript:@"navigator.userAgent" completionHandler:^(NSString * _Nullable UA, NSError * _Nullable error){
NSLog(@"UA-%@",UA);
webView.customUserAgent = [UA stringByReplacingOccurrencesOfString:@" OS" withString:@""];
}];
