The button scrolling to the top disappears when the page is refreshed

[zhuozhang090807]

Scroll to the top example action: The page scrolls to the bottom and the button appears; the page refreshes, the page stays at the bottom, but the button disappears.
In this case or when the anchor is in the middle of the page to open the page, the button needs to be displayed. What do I need to set up and the button will appear?