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Javascript: Back To Top Script (Easing)

/ Published in: JavaScript
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  1. function backToTop() {
  2.     var x1 = x2 = x3 = 0;
  3.     var y1 = y2 = y3 = 0;
  4.     if (document.documentElement) {
  5.         x1 = document.documentElement.scrollLeft || 0;
  6.         y1 = document.documentElement.scrollTop || 0;
  7.     }
  8.     if (document.body) {
  9.         x2 = document.body.scrollLeft || 0;
  10.         y2 = document.body.scrollTop || 0;
  11.     }
  12.     x3 = window.scrollX || 0;
  13.     y3 = window.scrollY || 0;
  14.     var x = Math.max(x1, Math.max(x2, x3));
  15.     var y = Math.max(y1, Math.max(y2, y3));
  16.     window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  17.     if (x > 0 || y > 0) {
  18.         window.setTimeout("backToTop()", 25);
  19.     }
  20. }
  21.  
  22.  
  23.  
  24. <a href="#" onclick="backToTop(); return false">Back to top</a>

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