Automatic email sending using pure javascript _ javascript skills

When we send an email, we can customize the Mail sending time. how can we use the code to implement this? This article describes how to use javascript to automatically send emails. if you are interested, refer to the following description:

This JavaScript will help your email recipients. Just click the email. someone else! And JavaScript will ask for the email address, subject, etc. then you, the new email, is opened to you.