can we reset a controller variable value in javascript without using action attribute

I want to display some fields upon clicking the submit button in the same form

I want to reset my form fields after submiting the form

how to reset a page i;e i want to clear all the form fileds after submiting page

can we reset a controller variable value in javascript without using action attribute

how to reset a page i;e i want to clear all the form fileds after submiting page