The following JavaScript code can prevent the user from going back to the login screen after they have logged in:
if (window.history.replaceState) {
window.history.replaceState(null, null, window.location.href);
}
This code uses the replaceState method of the window.history object to replace the current history state with a new one that has the same URL. This effectively removes the login page from the user's browsing history, so when they click the back button, they will not be taken back to the login screen.
You can add this code to the page that is displayed after the user has successfully logged in. For example, if the user is redirected to a dashboard or home page after logging in, you can include this code in that page's JavaScript file or <script> tag.