Java Script iframe src 按顺序而不是随机更改链接

Question

我正在尝试使用 java 脚本自动更改iframesrc。但它是随机工作的。我希望这按顺序工作，并将毫秒更改为分钟..！

var pages=new Array();
pages[0]="http://www.virtusa.com";
pages[1]="https://www.listertechnologies.com/";
pages[2]="https://intellectdesign.com/";
var time=600000; // this is set in milliseconds
function pageChange() {
var rand=Math.floor(Math.random()*pages.length);
document.getElementById("frame").src=pages[rand];
setTimeout("pageChange()",time);
}
onload=pageChange; 

Answer 1

var pages = new Array();
pages[0] = "http://www.virtusa.com";
pages[1] = "https://www.listertechnologies.com/";
pages[2] = "https://intellectdesign.com/";
var index = 0;
var minute = 60000;
var time = 10 * minute; 
function pageChange() {
var rand = pages[index];
document.getElementById("frame").src = rand;
setTimeout(pageChange, time);
index = index == pages.length - 1 ? 0 : index + 1;
}
onload = pageChange;