小编n.a*_*ing的帖子

在开发Cordova插件时,我发现的所有教程都是这样的:

文件:AwesomePlugin.js

var AwesomePlugin = {
  kungfuGripAction = function(target, successCallback, failureCallback) {
    return cordova.exec(
      successCallback,
      failureCallback,
      'AwesomePluginClass',
      'kungfuGripAction',
      [target]
    );
  }
};

module.exports = AwesomePlugin;

文件:AwesomePluginClass.java

@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
    if (ACTION_KUNGFU_GRIP.equals(action)) {
        JSONObject target = args.getJSONObject(0);
        if (gripTarget(target)) {
            callbackContext.success("Target successfully gripped.");
            return true;
        } else {
            callbackContext.error("Could not grip target.");
            return false;
        }
    }

    Log.d(LOG_TAG, "INVALID ACTION! " + action);
    callbackContext.error("Invalid action: " + action);
    return false;
}

文件:clientCode.js

AwesomePlugin.kungfuGripAction(cobraEnemy, …

在此处找到的DRF文档示例中:

class SnippetList(APIView):
    """
    List all snippets, or create a new snippet.
    """
    def get(self, request, format=None):
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        serializer = SnippetSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

上面的示例format在get()和post()方法中都有一个未使用的参数.我已经逐步完成了rest_framework源代码,我找不到调度程序将此参数传递给get()或者post()方法的任何实例.该参数是否需要出现在方法定义中？如果是这样,它用于什么？什么时候使用？