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·þÎñÆ÷¶Ëser.php:
<?php
echo "abc";
?>

test.phpÀïµÄjavascript²¿·ÖÕâÑùд
var xmlHttp;
function DanWeiMingChengOnfocus()
{
if (window.XMLHttpRequest) //¼æÈÝMozilla¡¢SafariµÈä¯ÀÀÆ÷¶ÔÏó
{
xmlHttp = new XMLHttpRequest();
}
else if (window.ActiveXObject) //¼æÈÝIEä¯ÀÀÆ÷
{
try
{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); //´´½¨Msxml2.XMLHTTP¿Ø¼þ¶ÔÏó
}
catch (e)
{
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");//´´½¨Microsoft.XMLHTTP¿Ø¼þ¶ÔÏ󣬸ÿؼþ×÷ÓÃΪ»ñȡָ¶¨URLµÄÄÚÈÝ
}
catch (e)
{
}
}
}

xmlHttp.open("GET","ser.php", false);
xmlHttp.onreadystatechange = handleDanWeiMingCheng; 
xmlHttp.send(null);
}
function handleDanWeiMingCheng()
{
if(xmlHttp.readyState == 4)
{
if (xmlHttp.status == 200 || xmlHttp.status == 0)
{
alert(xmlHttp.responseText);
//alert("abc");
}
}
}

·¢ÏÖ½á¹û²»¶Ô£¬²»Äܵõ½abc£¬ÇëÎÊÊÇÄÄÀïÓÐÎÊÌ⣿
µÚÈý¸ö²ÎÊý¸ÄΪ true ÊÔÊÔ¿´
xmlHttp.open("GET","ser.php?n=" + escape(new Date()), true);


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