XMLHttpRequest和ActiveXObject学习

//var xmlHttpReq = new ActiveXObject("MSXML2.XMLHTTP.3.0");

//定义变量，存储对象
var xmlHttp;
// 创建XMLHttpRequest对象
if (window.ActiveXObject) {
xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
} else if (window.XMLHttpRequest) {
xmlHttpReq = new XMLHttpRequest();
}

xmlHttpReq.open("GET", "http://localhost:9090/html5/test", false);
xmlHttpReq.Onreadystatechange= handleStateChange;
xmlHttpReq.send();

// xmlHttpReq.responseText
// xmlHttpReq.responseXML

var htmlObj = "";
htmlObj &＃43;= "=============状态码=================
";
htmlObj &＃43;= "status=" &＃43; xmlHttpReq.status &＃43; "
";
htmlObj &＃43;= "statusText=" &＃43; xmlHttpReq.statusText &＃43; "
";
htmlObj &＃43;= "=============头信息=================
";
htmlObj &＃43;= "heads=" &＃43; xmlHttpReq.getAllResponseHeaders() &＃43; "
";
htmlObj &＃43;= "Content-Length=" &＃43; xmlHttpReq.getResponseHeader("Content-Length") &＃43; "
";
htmlObj &＃43;= "=============返回信息=================
";
htmlObj &＃43;= "respOnseStream=" &＃43; xmlHttpReq.responseStream &＃43; "
";

var obj = document.getElementById("showDiv");
obj.innerHTML = htmlObj;

function handleStateChange() {
// 请求的状态有5个&＃20540;：0=未初始化；1=正在加载；2=已经加载；3=交互中；4=完成；
if (xmlHttpReq.readyState == 4) {
// 200对应OK，如404=未找到网页
if (xmlHttpReq.status == 200) {
// alert(xmlHttpReq.responseText);
}
}
}