Thank you, the author gives a working binding in another reply(https://news.ycombinator.com/item?id=26669079 https://news.ycombinator.com/item?id=26669079), and

Thank you, the author gives a working binding in another reply(https://news.ycombinator.com/item?id=26669079 https://news.ycombinator.com/item?id=26669079), and the binding uses xclip -i like you said.