html.title随机显示内容以及滚动显示内容

var titleArr = ['111','222','333']
var index = Math.floor(Math.random() * titleArr.length);
window.document.title = titleArr[index];

var repeat=0;
var title=document.title;
var titLeng=title.length;
var start=0;
var titTime;

function titlemove() {
titl=title.substring(start, titLeng) + title.substring(0, start);
document.title=titl;
start++;
if (start==titLeng+1) {
start=0
if (repeat==0)
return
}
clearInterval(titTime);
titTime = setInterval("titlemove()",1000);
}

if(document.title){
titlemove();
}