How to cancel and accept Alert in Protractor?

You can cancel Alert in Protractor by using dismiss() as follows:

The dismiss() method is used to cancel the alert for handling alerts in Selenium. It is functional for all alert types: prompt, alert, and confirmation dialogue box.

driver.switchTo().alert().dismiss();
It activates by clicking on the “X” button in the prompt. 

You can accept Alert in Protractor by using accept() as follows:

The accept() method is used to accept an alert and continue with the webpage operation. It can be utilized for all JavaScript alert types. An alert command can be executed by using the variable for handling alerts in Selenium:

var myAlert = browser.switchTo().alert();
myAlert.accept();
Click on the 'OK' button will confirm the action