实现楼层(兼容ie8)功能

<!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>
实现楼层(兼容ie8)功能

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