WebView背景陰影消除

    for (UIView *subView in [webView subviews]) {
        if ([subView isKindOfClass:[UIScrollView class]]) {
            for (UIView *shadowView in [subView subviews]) {
                if ([shadowView isKindOfClass:[UIImageView class]]) {
                    shadowView.hidden = YES;
                }
            }
        }
    }