帮忙看下这个js代码有啥错，用vs调试总是出错

Question

    var outer=document.getElementById("outer");
    var oInner=document.getElementById("inner");
    var oLis =document.getElementsByTagName("li");
    var oleft=document.getElementById("left");
    var oright=document.getElementById("right");
    var step=0;
    var timer=null;
    function buttur(ele,obj){
     window.clearTimeout(ele.timer);
     var end=null;
     for(direc in obj){
      var direc1=direc.toLowerCase();
      var strOffset="offset"+direc1.substr(0,1).toUpperCase()+direc1.substring(1).toLowerCase();
      var target=obj[direc];
      var nSpeed=(target-ele[strOffset])/10;
      nSpeed=nSpeed>=0?Math.ceil(nSpeed):Math.floor(nSpeed);
      ele.style[direc1]=ele[strOffset]+nSpeed+"px";
      end+=nSpeed;
     }
     if(end)
      if(typeof fnCallback=="function"){
       fnCallback.call(ele);
      }else{
            ele.timer=window.setTimeout(function(){buttur(ele,obj)},30);
      }
    }
    var divs=document.createElement("div");
    divs.setAttribute("id","nav");
    for(var i=0; i<oLis.length;i++){
        var oa=document.createElement("em");
        oa.innerHTML=i+1;
        divs.appendChild(oa);
    }
    outer.appendChild(divs);
    var btn=document.getElementById("nav").getElementsByTagName("em");
    for(var i=0; i<btn.length; i++){
        btn[i].indx=i;
        btn[0].className="ehover";
        btn[i].onclick=function(){
            //window.clearTimeout(timer);
            for(var i=0; i<btn.length; i++){
                btn[i].className="";
                btn[this.indx].className="ehover";
            }
            buttur(oInner,{left:-oLis[0].offsetWidth*this.indx});
        }   
    }
    function autoMove(){
      step++;
     if(step<btn.length){
             for(var i=0; i<btn.length; i++){
                btn[i].className="";
                btn[step].className="ehover";
                buttur(oInner,{left:step*-1200});
            }          
      }else{
                step=btn.length-7;       
         }
      timer=window.setTimeout(autoMove,3000);
    }
    autoMove();
    oleft.onclick=function(){
     window.clearTimeout(timer);
     step++;
     if(step<btn.length){
             for(var i=0; i<btn.length; i++){
                btn[i].className="";
                btn[step].className="ehover";
                buttur(oInner,{left:step*-1200});
            }          
         }else{
                step=btn.length-7;       
         }
     }
    oright.onclick=function(){
     window.clearTimeout(timer);
     step--;
     if(step<0){
             step=btn.length;
         }else{
            for(var i=0; i<btn.length; i++){
                btn[i].className="";
                btn[step].className="ehover";
                buttur(oInner,{left:step*-1200});
            }
         }
    }
    
   oInner.onmouseover=function(){window.clearTimeout(timer);}
   oInner.onmouseout=function(){timer=window.setTimeout(autoMove,3000);}
   oleft.onmouseover=function(){window.clearTimeout(timer);}
   oleft.onmouseout=function(){timer=window.setTimeout(autoMove,3000);}
   oright.onmouseover=function(){window.clearTimeout(timer);}
   oright.onmouseout=function(){timer=window.setTimeout(autoMove,3000);}
 

Answer 1

一般代码长度超过屏幕长度时，就没人看了，你找出关键的地方再发出来吧