var XMLHttpReq;var userAviable;
 	//創建XMLHttpRequest對象       function createXMLHttpRequest() {    if (window.XMLHttpRequest) { //Mozilla 瀏覽器        XMLHttpReq = new XMLHttpRequest();    } else {        if (window.ActiveXObject) { // IE瀏覽器            try {                XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");            }            catch (e) {                try {                    XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");                }                catch (e) {                }            }        }    }}
	//發送請求函數function sendRequest(url) {    createXMLHttpRequest();    XMLHttpReq.open("GET", url, true);    XMLHttpReq.onreadystatechange = processResponse;//指定響應函數    XMLHttpReq.send(null);  // 發送請求}
	// 處理返回信息函數function processResponse() {    if (XMLHttpReq.readyState == 4) { // 判斷對象狀態        if (XMLHttpReq.status == 200) { // 信息已經成功返回，開始處理信息
             var res = XMLHttpReq.responseText;            if (res == 1) {                window.alert("用戶名已經被占用,請更換!");            	document.regForm.uname.focus();            	userAviable=false;            }else{            	userAviable=true;            }        } else { //頁面不正常            window.alert("\u60a8\u6240\u8bf7\u6c42\u7684\u9875\u9762\u6709\u5f02\u5e38\u3002");        }    }}function checkUser(){    var uname = document.regForm.uname.value;	if (uname == "") {	        window.alert(document.regForm.uname.msg);	        document.regForm.uname.focus();	        return false;	    } else {	    	sendRequest("checkUname?uname=" + uname);	    }}
	// 注冊函數function regist() {    if (!userAviable) {        return false;    }    var uname = document.regForm.uname.value;    var psw = document.regForm.psw.value;    var psw2 = document.regForm.psw2.value;    var subject = document.regForm.subject.value;    var email = document.regForm.email.value;    if (uname == "") {        window.alert(document.regForm.uname.msg);        document.regForm.uname.focus();        return false;    } else {        if (psw == "") {            window.alert(document.regForm.psw.msg);            document.regForm.psw.focus();            return false;        } else {            if (psw != psw2) {                window.alert(document.regForm.psw2.msg);                document.regForm.psw2.focus();                return false;            } else {                if (subject == "") {                    window.alert(document.regForm.subject.msg);                    document.regForm.subject.focus();                    return false;                } else {                    if (email == "") {                        window.alert(document.regForm.email.msg);                        document.regForm.email.focus();                        return false;                    } else {                        return true;                    }                }            }        }    }}