How can I make the `div` get the `focus` and the `focus` is on the right side of the text?
What I want is once you click the button, the div which is `contenteditable' is`focus`, and the`focus` is on the right side of the text
Thanks :)
I've tried the solution to the system's recommended problem, but it has an error 

> 
> Failed to execute 'setStart' on 'Range': parameter 1 is not of type
>  'Node' ...
> 
> 
>