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时间：2023-12-12 02:00:33 下载该word文档

js建立XMLHttpRequest对象及其属性和方法1.//定义变量，存储对象2.varxmlHttp;3.//创建XMLHttpRequest对象4.functioncreatXMLHttpRequest(5.{6.if(window.ActiveXObject7.{8.xmlHttp=newActiveXObject("Microsoft.XMLHTTP";9.}10.elseif(window.XMLHttpRequest11.{12.xmlHttp=newXMLHttpRequest(;13.}14.}15.//使用get方式建立与后台的交互16.functioncallServer(17.{18.creatXMLHttpRequest(19.varemail=document.getElementById("TxtEmail".value;20.if(email==""21.{22.document.getElementById("LabMsg".innerText="请输入邮箱！";23.document.getElementById("LabMsg".style.color="red";24.}25.else26.{27.url="register.aspx?email="+email+"&ts"+newDate(.getTime(;28.xmlHttp.onreadystatechange=handleStateChange;29.xmlHttp.open("GET",url,true;30.xmlHttp.send(null;31.}32.}33.//回调函数，后台处理完结果后返回给回调函数34.functionhandleStateChange(35.{36.//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；37.if(xmlHttp.readyState==438.{
39.//200对应OK，如404=未找到网页40.if(xmlHttp.status==20041.{42.varresult=xmlHttp.responseXML.getElementsByTagName("result"[0].firstChild.nodeValue;43.if(result=="true"44.{45.document.getElementById("LabMsg".innerHTML="恭喜，可用！";46.document.getElementById("LabMsg".style.color="red";47.}48.elseif(result=="false"49.{50.document.getElementById("LabMsg".innerText="该邮箱已存在！";51.document.getElementById("LabMsg".style.color="red";52.}53.}54.}55.}56.57.post请求58.url="register.aspx?email="+email+"&ts"+newDate(.getTime(;59.xmlHttp.onreadystatechange=handleStateChange;60.xmlHttp.open("POST",url,false;61.xmlHttp.SetRequestHeader("Content-Type","application/x-www-form-urlencoded";62.xmlHttp.send(null;//定义变量，存储对象varxmlHttp;//创建XMLHttpRequest对象functioncreatXMLHttpRequest({if(window.ActiveXObject{xmlHttp=newActiveXObject("Microsoft.XMLHTTP";}elseif(window.XMLHttpRequest{xmlHttp=newXMLHttpRequest(;}}//使用get方式建立与后台的交互functioncallServer({creatXMLHttpRequest(varemail=document.getElementById("TxtEmail".value;if(email==""{后台处理请求的代码：viewplaincopytoclipboardprint?1.//写在所请求的URL页面的page_load下2.stringemail;3.email=Request.QueryString["email"];4.myCustomer.Email=email;

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