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

//定義變數，儲存物件
var xmlHttp;
// 建立XMLHttpRequest物件
if (window.ActiveXObject) {
   xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
} else if (window.XMLHttpRequest) {
   xmlHttpReq = new XMLHttpRequest();
}

xmlHttpReq.open("GET", "", false);
xmlHttpReq.onreadystatechange = handleStateChange;
xmlHttpReq.send();

// xmlHttpReq.responseText
// xmlHttpReq.responseXML

var htmlObj = "";
htmlObj += "=============狀態碼=================
";
htmlObj += "status=" + xmlHttpReq.status + "
";
htmlObj += "statusText=" + xmlHttpReq.statusText + "
";
htmlObj += "=============頭資訊=================
";
htmlObj += "heads=" + xmlHttpReq.getAllResponseHeaders() + "
";
htmlObj += "Content-Length=" + xmlHttpReq.getResponseHeader("Content-Length") + "
";
htmlObj += "=============返回資訊=================
";
htmlObj += "responseStream=" + xmlHttpReq.responseStream + "
";

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

function handleStateChange() {
   // 請求的狀態有5個值：0=未初始化；1=正在載入；2=已經載入；3=互動中；4=完成；
   if (xmlHttpReq.readyState == 4) {
       // 200對應OK，如404=未找到網頁
       if (xmlHttpReq.status == 200) {
           // alert(xmlHttpReq.responseText);
       }
   }
}

XMLHttpRequest和ActiveXObject學習

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