瞭解A jax基本概念.簡單流程如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.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
{
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>
瞭解Ajax中最基本的對象:XMLRequest的方法和屬性,如:
open('method','url');
send();
responseText;