javascript adjust div (show/hide) display according to window scroll bar

How to change the div position, i.e in absolute position, up or down开发者_开发技巧 according to window scroll position?

If there any information regarding this, please help me out.

Or if there any example over this please share.

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It's hard to understand what you're saying, but could you be looking for position:fixed instead of position:absolute? Fixed position elements don't scroll with the rest of the page, but remain at a specific position in the window.