XMLHttpRequest和ActiveXObject学习

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//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 += "=============状态码================= ";
htmlObj += "status=" + xmlHttpReq.status + " ";
htmlObj += "statusText=" + xmlHttpReq.statusText + " ";
htmlObj += "=============头信息================= ";
htmlObj += "heads=" + xmlHttpReq.getAllResponseHeaders() + " ";
htmlObj += "Content-Length=" + xmlHttpReq.getResponseHeader("Content-Length") + " ";
htmlObj += "=============返回信息================= ";
htmlObj += "responseStream=" + xmlHttpReq.responseStream + " ";

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

function handleStateChange() {
 // 请求的状态有5个值：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);
 }
 }
}

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