怎么浏览器一直报错？？、

Question

<script type="text/javascript">

window.onload = function() {

var oDiv = document.getElementById('o');

oDiv.onmouseover = function() {

startMove();

}

}

function startMove(){

var oDiv = document.getElementById('0');

setInterval(function() {

oDiv.style.left = oDiv.offsetLeft+10+'px';

}, 30)

}