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