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try
{
WebRequest myRequest = WebRequest.Create(" http://www.facebook.com");
WebResponse myResponse = myRequest.GetResponse();
myResponse.Close();
Response.Write("success");
}
catch
{
Response.Write("failed");
}
<script language="javascript">
var objFacebookBox ;
function isok(URL){
objFacebookBox =document.getElementById("facebookBox");
var req;
req = false;
if(window.ActiveXObject)
{
req = new ActiveXObject("Microsoft.XMLHTTP") ;
}
else if(window.XMLHttpRequest)
{
req = new XMLHttpRequest();
}
if (!req)
{
return false;
}
req.open( 'get', URL, true);
// var a=selval;
// alert(req.readyState);
req.onreadystatechange=function (){
if (req.readyState == 4) {
if (req.status == 200) {
objFacebookBox.innerHTML="true" + req.responseText;
} else {
objFacebookBox.innerHTML="false"+req.status.toString();
}//status==200
}//readyState==4
}
req.send(null);
return true;
}
isok("http://www.facebook.com");
</script>
<html>
<body>
<script>
var time=0;
var mep=null;
var iframe = document.createElement("iframe");
iframe.src="http://www.facebook.com/";
iframe.style.display="none";
getmep();
if (!/*@cc_on!@*/0) { //浏览器 不是IE的情况下
iframe.onload = function(){
clearInterval(mep);//停止走表
if(time ==0 || time >6)
{
alert("不能访问!");
}
else
{
alert("可以访问!");
}
}
} else { //IE浏览器
iframe.onreadystatechange = function(){
if (iframe.readyState == "complete"){
clearInterval(mep);
if(time ==0 || time >6)
{
alert("不能访问!");
}
else
{
alert("可以访问!");
}
}
}
}
document.body.appendChild(iframe);
function showTime()
{
if(time > 5)
{
iframe.src="";
}
time = time +1;
}
function getmep()
{
mep=setInterval(showTime,1000);
}
</script>
</body>
</html>
<script>var time=0;var mep;</script>
<iframe src="http://www.facebook.com/" id="ifr_child" style="width:100px; height:100px; display:none;" onload="getbody()" ></iframe>
<script>
var $ = function (objId) {
return document.all ? document.all[objId] : document.getElementById(objId);
}
function getbody()
{
if(mep!=null)
clearInterval(mep);
time=time +1;
mep=setInterval(showTime,1000);
}
function showTime()
{
if(time==1)
{
alert("恭喜你,你可以访问facebook")
}
else
{
alert("很遗憾的告诉你,你不可以访问facebook,原因你懂的!")
}
clearInterval(mep);
}
//setInterval(getbody,5000);
</script>