Difference Analysis of confirm, alert and prompt functions in JS _ javascript skills

What are the differences between confirm, alert, and prompt functions in JS? Window. alert: only one parameter. The warning box is displayed;
No return value.
Script
Window. alert ("OK .")
Script
Window. confirm: there is only one parameter. The prompt box is displayed.
Press OK to return true; Press Cancel to return false.
Script
Var bln = window. confirm ("OK? ");
Alert (bln)
Script
Window. prompt: parameter, which has two,
The first parameter displays the information in the prompt input box.
The second parameter is used to display the default value of the input box.
Returned value: the value entered by the user.

The Code is as follows:

Script
Var str = window. prompt ("enter the password", "password ")
Alert (str );
Script