Empty XmlHttp responsetext (only Google Chrome)

问题

I have a problem with my chat script in Google Chrome. Sometimes the responsetext is empty until you reload the page, but sometimes it's working well. It opens a xmlhttp connection every second and if the first good the ones after that also good. In Firefox it's always good.

var url = "text.php";
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = myfunc;
xmlHttp.send(null);

function myfunc()
{
    if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete")
    {
        var msg = xmlHttp.responseText;
        alert(msg);
    }
}

回答1:

try this out

var xmlHttp;
xmlHttp=new XMLHttpRequest();
var url = "text.php";
xmlHttp.onreadystatechange = function()
{
    if (xmlHttp.readyState==4 && xmlHttp.status==200)
    {
        var msg = xmlHttp.responseText;
        alert(msg);
    }
}
xmlHttp.open("GET", url, true);
xmlHttp.send(null);

来源：https://stackoverflow.com/questions/18162428/empty-xmlhttp-responsetext-only-google-chrome