Ajax synchronous and asynchronous transfer of sample code _javascript tips

Copy Code code as follows:

Synchronous transfer Mode

function Requestbyget (nproducttemp,ncountrytemp)
{
var xmlhttp

if (window. XMLHttpRequest)
{
Isie = false;
XMLHTTP = new XMLHttpRequest ();
}
else if (window. ActiveXObject)
{
Isie = true;
XMLHTTP = new ActiveXObject ("Microsoft.XMLHTTP");
}

Web page location.
var url= "http://www.jb51.net/;
Xmlhttp.open ("Get", URL, false);
xmlHTTP. setRequestHeader ("Content-type", "text/html; Charset=shift_jis")
Xmlhttp.send (NULL);
var result = Xmlhttp.status;

Ok
if (result==200)
{
document.getElementById ("Div_rightbarbody"). Innerhtml=xmlhttp.responsetext;
}
XMLHTTP = null;
}


Asynchronous Transfer Mode
var xmlhttp

function Requestbyget (nproducttemp,ncountrytemp)
{
if (window. XMLHttpRequest)
{
Isie = false;
XMLHTTP = new XMLHttpRequest ();
}
else if (window. ActiveXObject)
{
Isie = true;
XMLHTTP = new ActiveXObject ("Microsoft.XMLHTTP");
}

Web page location.
var url= "http://www.jb51.net/";
Xmlhttp.open ("Get", URL, True);
Xmlhttp.onreadystatechange = Handleresponse;
xmlHTTP. setRequestHeader ("Content-type", "text/html; Charset=utf-8")
Xmlhttp.send (NULL);
}

function Handleresponse ()
{
if (xmlhttp.readystate = = 4 && xmlhttp.status==200)
{
document.getElementById ("Div_rightbarbody"). Innerhtml=xmlhttp.responsetext;
XMLHTTP = null;
}
}