How to change the attribute of html tag to active?

Question

I have four tab first tab classname should be active and then if I click second tab first tab should disable means class name should be empty and the active should move to second tab class name....anyone have idea... I need help guys

Answer 1

Like this ?

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_tabs

Mike C