Posted on 2008-09-24 16:01
鱼跃于渊 阅读(374)
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平时小练习
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
window.onload=initAll ;
var xhr = false ;
var url = "ajax02.xml" ;
function initAll(){
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest() ;
}else{
if(window.ActiveXObject){
try{
xhr = new ActiveXObject("Microsoft.XMLHttpRequest") ;
}catch(e){}
}
}
if(xhr){
xhr.onreadystatechange = showContents ;
xhr.open("GET", url, true) ;
xhr.send(null) ;
}else{
document.getElementById("updateArea").innerHTML = "sorry ! but your pc coundn't create a xhr object !" ;
}
setTimeout("initAll()", 500) ;
}
function showContents(){
if(xhr.readyState == 4){
if(xhr.status == 200){
var tempDiv = document.createElement("div") ;
var imgDiv = document.getElementById("imgDiv") ;
tempDiv.innerHTML = xhr.responseText ;
var allLinks = tempDiv.getElementsByTagName("a") ;
//alert(allLinks.length) ;
for(i=0; i<allLinks.length; i++){
//imgDiv.appendChild(allLinks[i].cloneNode(true)) ;
//var br = document.createElement("br") ;
//imgDiv.appendChild(br) ;
}
var imgid = Math.floor(Math.random() * allLinks.length) ;
document.getElementById("imgDiv").innerHTML = allLinks[imgid].innerHTML ;
}else{
var outMsg = "there was a problem on your server : status = " + status ;
}
}
}
</script>
</head>
<body>
<center>
<div id="imgDiv"></div>
</center>
</body>
</html>
XML 文件为 :
<?xml version="1.0" encoding="UTF-8"?>
<author>
<entry>
<a href="jason1"><img width="100" height="100" border="0" src="images/1.jpg" /></a>
</entry>
<entry>
<a href="jason1"><img width="100" height="100" border="0" src="images/2.jpg" /></a>
</entry>
<entry>
<a href="jason1"><img width="100" height="100" border="0" src="images/3.jpg" /></a>
</entry>
<entry>
<a href="jason1"><img width="100" height="100" border="0" src="images/4.jpg" /></a>
</entry>
<entry>
<a href="jason1"><img width="100" height="100" border="0" src="images/5.jpg" /></a>
</entry>
</author>