javascript - Adding scroll speed to function -


i have following code. how use setinterval or settimeout make jump 0px 500px happen in 3000ms?

<!doctype html> <html> <head> <style> body { width: 5000px; } </style> </head> <body>  <p>click button scroll document window 500 pixels horizontally.</p>  <button onclick="scrollwin()">click me scroll horizontally!</button><br>    <br>  <script> function scrollwin() { window.scrollto(500, 0); } </script>  </body> </html>

here's 1 way - divide number of pixels move amount of time move in. use setinterval move number of pixels in fixed length of time inervaltime. then, cancel interval when scroll position reaches target.

function scrollwin(target, time) {    var currentposition = window.pagexoffset || document.documentelement.scrollleft;    var scrollinterval = target / time;    var intervaltime = 10;    var intervalfunction;    intervalfunction = setinterval(function() {      currentposition = currentposition + scrollinterval * intervaltime;      window.scrollto(currentposition, 0);      if (currentposition >= target) {        window.clearinterval(intervalfunction);      }    }, intervaltime)  }
body {    width: 5000px;  }
<p>click button scroll document window 500 pixels horizontally.</p>    <button onclick="scrollwin(500, 3000)">click me scroll horizontally!</button>


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