event.py 文件源码

def js_query(self, query: str) -> Awaitable:
        """Send query to related DOM on browser.

        :param str query: single string which indicates query type.
        """
        if self.connected:
            self.js_exec(query, self.__reqid)
            fut = Future()  # type: Future[str]
            self.__tasks[self.__reqid] = fut
            self.__reqid += 1
            return fut
        f = Future()  # type: Future[None]
        f.set_result(None)
        return f