window.onload=function(){
        var aLi=document.getElementsByTagName("li");
        for(var i=0;i<aLi.length;i++){
            aLi[i].onmousevoer=function(){
                startMove(this,400);
            }
            aLi[i].onmouseout=function(){
                startMove(this,200);
            }
        }
    

        var timer=null;
        function startMove(obj,iTarget){
            clearInterval(timer);
            timer=setInterval(function(){
                var speed=(iTarget-obj.offsetWidth)/8;
                speed=speed>0 ? Math.ceil(speed) :Math.floor(speed);
                if (obj.offsetWidth==iTarget) {
                    clearInterval(timer);
                }else{
                    obj.style.width=obj.offsetWidth+speed+"px";
                }
            },30);
        }
    }

为什么这样写一点反应都没有？