前台代码
C# code:
<head runat="server">
<title>ajax</title>
<script type ="text/javascript" >
var xmlHttp;
function createXMLHttpRequest(){
debugger
if (window.ActiveXObject)
xmlHttp =new ActiveXObject ("Microsoft.XMLHTTP");
else if (window.XMLHttpRequest )
xmlHttp =new XMLHttpRequest();
}
function startRequest() {
debugger
createXMLHttpRequest();
xmlHttp.onreadystatechange = state_Change;
xmlHttp.open("GET", "Handler2.ashx", true);
xmlHttp.send(null);
}
function state_Change() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
alert("服务器返回：" + xmlHttp.responseText)
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="测试异步通信" OnClientClick="startRequest()" />
</div>
</form>
</body>
</html>
后台代码：
C# code
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