AJAX - XMLHttpRequest ?? ??
XMLHttpRequest ??
XMLHttpRequest ??? Ajax ??? ?????.
?? ?? ????? XMLHttpRequest ??? ?????(IE5 ? IE6? ActiveXObject? ?????).
???? ?? ??? ?? ??? ?????? ?? Ajax? ?? ? ?????. ? ??? ??? ?? XMLHttpRequest ?? ?????. XMLHttpRequest ??? ???? Windows ??????? ?? ? ??????? ???? ?? ???? ??? ?? ?? ??? ???? ?? ?? ?? ??? ???? ??? ??? ??? ??? ? ????. ??? ??? ???? ?? ??? ??? ? ????. . ?? ?? ?? ??? ?????.
XMLHttpRequest ?? ???
?? ????(IE7+, Firefox, Chrome, Safari ? Opera)?? ?? XMLHttpRequest ??? ???? ????.
XMLHttpRequest ?? ??? ?? ??:
variable=new XMLHttpRequest();
Internet Explorer? ?? ??(IE5 ? IE6)? ActiveX ??? ?????.
variable=new ActiveXObject("Microsoft.XMLHTTP");
IE5 ? IE6? ??? ?? ?? ?????? ????? ????? XMLHttpRequest ??? ????? ?????. ???? ?? XMLHttpRequest ??? ????. ???? ?? ?? ActiveXObject? ?????: :
<!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","/try/ajax/ajax_info.txt",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>使用AJAX</h2></div>
<button type="button" onclick="loadXMLDoc()">點(diǎn)擊修改</button>
</body>
</html>
