html部分

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<div id="ease-target"><span id="ease\_go\_top"><i class="fa fa-chevron-up"></i></span>
</div>

js部分

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// 返回顶部
var ease\_go\_top = document.getElementById("ease\_go\_top");
function ease_scrollToTop(t){
var x = 0;
var scroll_Top = document.body.scrollTop || document.documentElement.scrollTop;
var time = setInterval(function(){
x+=scroll_Top*30/t;
if(x>scroll_Top){
clearInterval(time);
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}else{
document.body.scrollTop = scroll_Top-x;
document.documentElement.scrollTop = scroll_Top-x;
}
},30)
}
ease\_go\_top.onclick = function(){
ease_scrollToTop(1000);
}
// end-返回顶部

添加css样式

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#ease\_go\_top{
position: fixed;
right: 10px;
bottom: 10px;
width: 50px;
height: 50px;
text-align: center;
background: rgba(255,255,255,0.6);
font-size: 30px;
cursor: pointer;

}
#ease\_go\_top i{
font-size: 30px;
}

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