RN Setting onMessage on a WebView overrides existing values of window.postMessage, but a previous value was defined错误

在使用RN的WebView时有时会弹出：

Setting onMessage on a WebView overrides existing values of window.postMessage, but a previous value was defined 错误的一个界面，关闭后不影响正常使用。

简述下解决方案：

1、在使用WebView的界面添加如下代码

patchPostMessageFunction = function() {
        var originalPostMessage = window.postMessage;
      
        var patchedPostMessage = function(message: any, targetOrigin: string, transfer: Transferable[] | undefined) { 
          originalPostMessage(message, targetOrigin, transfer);
        };
      
        patchedPostMessage.toString = function() { 
          return String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage');
        };
      
        window.postMessage = patchedPostMessage;
      };
      
     patchPostMessageJsCode = '(' + String(this.patchPostMessageFunction) + ')();';

2、WebView中设置injectedJavaScript属性

<WebView
                    injectedJavaScript={this.patchPostMessageJsCode} 
                />

参考地址：https://github.com/facebook/react-native/issues/10865#issuecomment-269847703