frame_manager.py 文件源码

def querySelectorEval(self, selector: str, pageFunction: str,
                                *args: Any) -> Optional[Any]:
        """Execute function on element which matches selector."""
        elementHandle = await self.querySelector(selector)
        if elementHandle is None:
            raise PageError(
                f'Error: failed to find element matching selector "{selector}"'
            )
        result = await elementHandle.evaluate(pageFunction, *args)
        await elementHandle.dispose()
        return result