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Mar 25th, 2019
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  1. var nav = document.getElementById('nav'),
  2. inner = document.getElementById('inner'),
  3. height = inner.innerHeight,
  4. scroll,
  5. lastScroll = 0;
  6.  
  7. function navCheck() {
  8. scroll = inner.scrollTop;
  9.  
  10. if (scroll >= lastScroll) {
  11. nav.className = 'fixed slide-up';
  12. } else {
  13. nav.className = 'fixed slide-down';
  14. }
  15.  
  16. lastScroll = scroll;
  17. }
  18.  
  19. inner.onscroll = navCheck;
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