一个容易的AJAX例子 _Ajax

一个简单的AJAX例子

xml 代码

<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Strict//EN" ??
??"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">??
<html?xmlns="http://www.w3.org/1999/xhtml">??
<head>??
<title>Simple?XMLHttpRequest</title>??
??? ??
<script?type="text/javascript">??
var?xmlHttp; ??
??
function?createXMLHttpRequest()?{ ??
????if?(window.ActiveXObject)?{ ??
????????xmlHttp?=?new?ActiveXObject("Microsoft.XMLHTTP"); ??
????} ??
????else?if?(window.XMLHttpRequest)?{ ??
????????xmlHttp?=?new?XMLHttpRequest(); ??
????} ??
} ??
??? ??
function?startRequest()?{ ??
????createXMLHttpRequest(); ??
????xmlHttp.onreadystatechange?=?handleStateChange; ??
????xmlHttp.open("GET",?"simpleResponse.xml",?true); ??
????xmlHttp.send(null); ??
} ??
??? ??
function?handleStateChange()?{ ??
????if(xmlHttp.readyState?==?4)?{ ??
????????if(xmlHttp.status?==?200)?{ ??
????????????alert("The?server?replied?with:?"?+?xmlHttp.responseText); ??
????????} ??
??
} ??
} ??
</script>??
</head>??
??
<body>??
????<form?action="#">??
????????<input?type="button"?value="Start?Basic?Asynchronous?Request"?onclick="startRequest();"/>??
????</form>??
</body>??
</html>??
??
所用到的xml文件 ??
??
simpleResponse.xml//放在同一个目录下就可以了 ??
??
Hello?from?the?server! ??
? ??