var xmlHttpRequest;function createXMLHttpRequest() { var xmlHttp; if (window.ActiveXobject) { xmlHttp = new ActiveXobject("MSXML2.XMLHTTP.3.0"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } return xmlHttp;}function validateUserName() { var username = document.getElementById("tbUserName").value; var data = "username=" + escape(username); xmlHttpRequest = createXMLHttpRequest(); xmlHttpRequest.onreadystatechage = callback; xmlHttpRequest.open("Post", "AjaxPages/CheckUserIsRegister.aspx?num=" + Math.random(), true); //使用post時需 xmlHttpRequest.setRequestHeader("Content-Length", urlData.length); xmlHttpRequest.setRequestHeader("CONTENT-TYPE", "application/x-www-form-urlencoded"); xmlHttpRequest.send(data);}function callback() { if (xmlHttpRequest.readyState == 4) { if (xmlHttpRequest.status == 200) { var result = xmlHttpRequest.responseText; if (result == "0") { document.getElementById("spCheck").innerHTML = "恭喜你,該使用者名稱可以註冊"; } else if (result == "1") { document.getElementById("spCheck").innerHTML = "對不起,該使用者名稱已使用"; } else { document.getElementById("spCheck").innerHTML = result; } } }}