js定时刷新网页

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>