Property:
1:onReadStateChange[指定当readyState属性改变时的事件处理句柄。只写]
Example:
var xmlhttp=null;
function PostOrder(xmldoc)
{
var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP.5.0");
xmlhttp.Open("POST", "http://myserver/orders/processorder.asp";, false);
...
