If your looking for the fastest way just to scroll to top using native Javascript then use this
To scroll to the top of the browser use this code (good for mobile)
$('html, body').animate({ scrollTop: 0 }, 'fast');
Another version here
This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.
