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ajax中常用的三种数据格式分别为xml, text, json(JavaScript Object Notation)。
特地将其用例结合起来，如下：
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<html><head>
<script>
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
}
function xmlReq(){
createXMLHttpRequest();
xmlHttp.onreadystatechange = xmlhandle;
xmlHttp.open("GET", "data.xml", true);
xmlHttp.send(null); //发送请求
}
function xmlhandle(){
if(xmlHttp.readyState == 4){
if (xmlHttp.status == 200 || xmlHttp.status == 0){
var xmlDOM = xmlHttp.responseXML;// 取得XML的DOM对象
var root = xmlDOM.documentElement;
var info = root.getElementsByTagName('info');// 取得<info>结果
alert("XML's value: " + info[0].firstChild.data);
}
}
}
function txtReq(){
createXMLHttpRequest();
xmlHttp.onreadystatechange = txthandle;
xmlHttp.open("GET", "data.txt", true);
xmlHttp.send(null); //发送请求
}
function txthandle(){
if(xmlHttp.readyState == 4){
if (xmlHttp.status == 200 || xmlHttp.status == 0){
alert("Text's value: " + xmlHttp.responseText);
}
}
}
function jsonReq(){
createXMLHttpRequest();
xmlHttp.onreadystatechange = jsonhandle;
xmlHttp.open("GET", "data.txt", true);
xmlHttp.send(null); //发送请求
}
function jsonhandle(){
if(xmlHttp.readyState == 4){
if (xmlHttp.status == 200 || xmlHttp.status == 0){
var resp = xmlHttp.responseText;// 构造返回JSON对象的方法
var func = new Function("return "+resp);
var json = func();// 得到JSON对象
alert("JSON's value: " + json.info + "(" + json.version + "v)");
}
}
}
</script>
<title>Ajax Hello World</title>
</head>
<body>
<input type="button" value="XML" onclick="xmlReq();" />
<input type="button" value="Text" onclick="txtReq();" />
<input type="button" value="JSON" onclick="jsonReq();" />
</body>
</html>
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其中用到的data.txt:
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{
info: "hello weixq!",
version: "2.0"
}
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data.xml:
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<?xml version="1.0" encoding="GB2312" ?>
<root>
<info>hello world!</info>
</root>
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