直接上代码：
实现三个子页面同时刷新页面
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<iframe id="ifr" width=400 height=500></iframe>
<iframe id="ifr2" width=400 height=500></iframe>
<iframe id="ifr3" width=400 height=500></iframe>
<div id='count' width=30 height=30 style="background:red; font-size:30"></div>
<script type="text/javascript">
url = new Array();
url[0] = "http://blog.csdn.net/youacai/article/details/6644023";
url[1] = "http://blog.csdn.net/youacai/article/details/6717063";
url[2] = "http://blog.csdn.net/youacai/article/details/6588057";
url[3] = "http://blog.csdn.net/youacai/article/details/6707787";
url[4] = "http://blog.csdn.net/youacai/article/details/6646634";
url[5] = "http://blog.csdn.net/youacai/article/details/6705466";
url[6] = "http://blog.csdn.net/youacai/article/details/6651285";
url[7] = "http://blog.csdn.net/youacai/article/details/6681695";
url[8] = "http://blog.csdn.net/youacai/article/details/6708574";
url[9] = "http://blog.csdn.net/youacai";
url[10] = "http://blog.csdn.net/youacai/article/details/6717063";
var n = 1;
window.setInterval(function(){
i = Math.random() * url.length;
j = Math.floor(i);
k = parseInt(10*Math.random());//随机取0-10的整数
m = parseInt(10*Math.random()+1);//随机取1-10的整数
n++;
//alert(n);
document.getElementById("ifr").src=url[j];
document.getElementById("ifr2").src=url[k];
document.getElementById("ifr3").src=url[m];
document.getElementById("count").innerHTML = n;
},10000) //这里的10000等于10000毫秒 也就是10秒
window.setInterval(function(){
k = parseInt(10*Math.random());//随机取0-10的整数
document.getElementById("ifr3").src=url[k];
document.getElementById("ifr2").src="http://blog.csdn.net/youacai";
document.getElementById("ifr").src="http://blog.csdn.net/youacai";
},20000) //这里的10000等于10000毫秒 也就是10秒
</script>
</body>
</html>
