AJAX ?? ?? ??
ajax ?? ?? ???:
XMLHttpRequest ??? responseText ?? responseXML ??? ???? ???? ?? ???? ?????.
? ?? ?? ?? ??? ??? ????.
| Attribute | Description |
| responseText | ??? ???? ?? ???? ?????. |
| responseXML | ?? ???? XML ???? ?????. |
一.responseText ??:
??? ?? ???? XML? ?? ?? responseText ??? ???? ?????. ? ??? ?? ?? ??? ?????. ???? ??? ????.
document.getElementById("show").innerHTML=xmlhttp.responseText;?? ?? ?:
<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.miracleart.cn/" />
<title>php中文網</title>
<script>
function loadXMLDoc(){
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("show").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","demo/ajax/txt/demo.txt",true);
xmlhttp.send();
}
window.onload=function(){
var obt=document.getElementById("bt");
obt.onclick=function(){
loadXMLDoc();
}
}
</script>
</head>
<body>
<div id="show"><h2>原來的內容</h2></div>
<button type="button" id="bt">查看效果</button>
</body>
</html>??? ???? ??? ??? ???? ???? responseText ??? ?? div? ? ? ????.
2. responseXML ??:
??? ??? XML?? XML ??? ?? ????? ?? ?? responseXML ??? ???? ???.
var xmlDoc = xmlhttp.responseXML;
?? ? responseXML ?? ? XML ??? ?? ?? ?? ????? ??? ????.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="author" content="http://www.miracleart.cn/" />
<title>php中文網</title>
<script>
function loadXMLDoc() {
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var xmlDoc = xmlhttp.responseXML;
var str = "";
var targets = xmlDoc.getElementsByTagName("target");
for (index = 0; index < targets.length; index++) {
str = str + targets[index].childNodes[0].nodeValue + "<br>";
}
document.getElementById("show").innerHTML = str;
}
}
xmlhttp.open("GET", "demo/ajax/xml/XML.xml", true);
xmlhttp.send();
}
window.onload = function () {
var obt = document.getElementById("bt");
obt.onclick = function () {
loadXMLDoc();
}
}
</script>
</head>
<body>
<div>
<div id="show"></div>
<input id="bt" type="button" value="查看效果"/>
</div>
</body>
</html> 
