def alt_fn(self, i, pre_dl=None, post_dl=None):
self.delay(pre_dl)<EOL>self.k.press_key(self.k.alt_key)<EOL>self.k.tap_key(self.k.function_keys[i])<EOL>self.k.release_key(self.k.alt_key)<EOL>self.delay(post_dl)<EOL>
Press Alt + Fn1 ~ 12 once.

        **中文文档**

        按下 Alt + Fn1 ~ 12 组合键。