Вопрос решён:
| Код |
<div id="myBtn" class="upbtn" onclick="topFunction()"></div>
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| Код |
.upbtn,.upbtnB {
opacity: 0;
z-index: 100;
width: 60px;
height: 60px;
position: fixed;
bottom: 80px;
left: 20px;
cursor: pointer;
transition:all 1.0s ease;
background-image: url('up.gif')
}
.upbtnB {
opacity: 1;
}
.upbtnB:hover {
background-image: url('upH.gif');
transition:all 0.25s ease;
}
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| Код |
function scrollFunction()
{
if (document.body.scrollTop>20 || document.documentElement.scrollTop>20)
document.getElementById("myBtn").className="upbtnB";
else
document.getElementById("myBtn").className="upbtn";
}
function topFunction()
{
document.body.scrollTop=0;// For Safari
document.documentElement.scrollTop=0;// For Chrome, Firefox, IE and Opera
}
window.onscroll=scrollFunction;
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