WKWebView缩放禁用和文字显示偏小问题

使用WKWebView时，显示文字会偏小，是因为H5配置缺少了meta标签，可以让H5开发人员配置或在代码中加入以下内容; 需要禁用用户缩放手势时，可以再增加user-scalable=no字段，如下所示:

    WKWebViewConfiguration *webConfiguration = [[WKWebViewConfiguration alloc] init];
    NSString *js = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width, user-scalable=no'); document.getElementsByTagName('head')[0].appendChild(meta);";
    WKUserScript *wkUserScript = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
    WKUserContentController *wkUController = [[WKUserContentController alloc] init];
    [wkUController addUserScript:wkUserScript];
    webConfiguration.userContentController = wkUController;

参考文章: https://www.jianshu.com/p/856cefbbf4b0