原因在於scroll時動畫不斷重新play，在progress加上.pause()即可解決：
$(window).on("scroll", function(){
var top = $(window).scrollTop();
var percentofprogress=(top+$(window).height())/($(document).height()-$(window).height());
//console.log(top);
//console.log(top/($doc.height()-$win.height()));
tl.progress(percentofprogress).pause();
} )
case #thebodyshop
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