有谁能够帮我看看这个js代码问题出在哪里吗？红色代码那里是显示后面黄子的错误。

// 导师团队

var Oclone=document.getElementsByClassName('clone');

var Tyos=document.getElementsByClassName('yos-tab-cnt-s')[0];

Tyos.style.width=Oclone.length*232+'px';（Uncaught TypeError: Cannot read property 'style' of undefined）

for (var i = 0; i < Oclone.length; i++) {

Oclone[i].index=i;

Oclone[i].onmouseover=function() {

for (var i = 0; i < Oclone.length; i++) {

Oclone[i].classList.remove("yos-dd");

};

Oclone[this.index].classList.add("yos-dd");

}

Oclone[i].onmouseout=function() {

Oclone[this.index].classList.remove("yos-dd");

}

};

var Lyos=document.getElementsByClassName('yos-l')[0];

var Ryos=document.getElementsByClassName('yos-r')[0];

var Tab=document.getElementsByClassName('yos-tab-cnt-s')[0];

var Oyos=document.getElementsByClassName('yos-tab')[0];

var indexy=0;

function yos (){

if(indexy>Oclone.length-6)

{

indexy=0;

}

//第index序号个图片

Tab.style.left=-indexy*232+'px';

}

var yost=setInterval(function(){

indexy++;

yos();

},1500)

Lyos.addEventListener('click' , function(){

if (indexy==0) {indexy=Oclone.length-5};

indexy--;

yos();

});

Ryos.addEventListener('click' , function(){

if (indexy==Oclone.length-5) {indexy==0};

indexy++;

yos();

});

Oyos.addEventListener('mouseover' , function(){

clearInterval(yost);

})

Oyos.addEventListener('mouseout' , function(){

yost=setInterval(function(){

indexy++;

yos();

},1500);

});