<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
list-style: none;
}
.main{
width: 800px;
margin: 0 auto;
}
.main li{
width: 800px;
height: 500px;
font-size: 100px;
}
.floor{
position:fixed;
left: 50px;
top:200px;
display: none;
}
.floor ul{
width: 40px;
background: red;
}
.floor ul li{
width: 40px;
height: 40px;
background: yellow;
line-height: 40px;
text-align: center;
cursor: pointer;
font-family: 微软雅黑;
font-size: 12px;
color:#666;
}
<script>
// 获取li集合
var li = document.getElementById('floors').getElementsByTagName('li');
// 定义数组
var arr = ['服装','手机','家具','游戏','电器','通信','冰箱'];
var arr1 = ['1F','2F','3F','4F','5F','6F','7F'];
var arr2=['500','1000','1500','2000','2500','3000','3500']
var goS,nowS,timer;
// 遍历
for( var i=0;i<li.length;i++){
// 存下标
li[i].i=i;
li[i].onmouseover=function(){
this.innerHTML=arr[this.i];
this.style.background="red";
this.style.color='#fff';
}
li[i].onmouseout=function(){
this.innerHTML=arr1[this.i];
this.style.background="yellow";
this.style.color="#666";
}
li[i].onclick=function(){
// 拿到要去的楼层高度
goS = arr2[this.i];
if (timer){
clearInterval(timer);
}
//如果当前滚轮的高度大于你要去的楼层高度，就执行runY函数
if (scroll()>goS){
// 每一毫秒都执行一次定时函数，每一次都要把滚轮高度减10
timer = setInterval(runY,1);
}
//如果当前滚轮的高度小于你要去的楼层高度，就执行runX
if (scroll() < goS) {
// 每一毫秒都执行一次定时函数，每一次都要把滚轮高度加10
timer = setInterval(runX,1);
}
}
function runY(){
// 滚动高度要不断的减少，才能到达你要去的楼层高度
if(document.body.scrollTop){
document.body.scrollTop=document.body.scrollTop-10;
// 假如滚轮高度小于等于你要去的楼层高度，清楚定时函数就停止了
if (document.body.scrollTop <= goS ) {
document.body.scrollTop = goS
clearInterval(timer);
}
}else{
document.documentElement.scrollTop=document.documentElement.scrollTop-10;
if(document.documentElement.scrollTop<=goS){
document.documentElement.scrollTop=goS;
clearInterval(timer);
}
}
}
function runX(){
// 滚动高度要不断的增加，才能到达你要去的楼层高度
if(document.body.scrollTop){
document.body.scrollTop=document.body.scrollTop+10;
if (document.body.scrollTop >= goS || document.body.scrollTop >=3201) {
document.body.scrollTop = goS;
clearInterval(timer);
}
}else{
document.documentElement.scrollTop=document.documentElement.scrollTop+10;
if(document.documentElement.scrollTop>=goS||document.documentElement.scrollTop>=3199){
document.documentElement.scrollTop=goS;
clearInterval(timer);
}
}
}
}
console.log(document.body.scrollTop);
// 滚动执行的函数，检测滚动条的距离
window.onscroll=function(){
var floors = document.getElementById('floors');
console.log(document.body.scrollTop);
console.log(document.documentElement.scrollTop)
var top=document.body.scrollTop||document.documentElement.scrollTop;
if(top<=10){
floors.style.display="none";
}else{
floors.style.display="block";
}
}
function scroll(){
if(document.body.scrollTop){
return document.body.scrollTop;
}else{
return document.documentElement.scrollTop;
}
}
</script>
</body>
</html>
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