（1）?寫發(fā)送代碼
var myXmlHttpRequest = "";
myXmlHttpRequest = getXmlHttpRequest();
??????????? if (myXmlHttpRequest) {? //xmlHttpRequest創(chuàng)建成功了，才能發(fā)送請求
??????????????? //地址一定要寫正確
??????????????? var url = "../zhuCe/zhuCeYanZheng.aspx?username=" + $('Text1').value;
??????????????? myXmlHttpRequest.open("get",url,true);
??????????????? myXmlHttpRequest.onreadystatechange = getData;
??????????????? myXmlHttpRequest.send(null);
??????????? }

（2）?寫接受數(shù)據(jù)代碼：
function getData() {
??????????? if((myXmlHttpRequest.readyState == 4) && (myXmlHttpRequest.status == 200)){
??????????????? //alert("nihao");
??????????????? var returnMessage = myXmlHttpRequest.responseText;
??????????????? //alert(returnMessage);
??????????????? if (returnMessage == "用戶名不正確"){
??????????????????? alert("aaa");
??????????????? }
??????????? }??
??????? }
(3)另外需要加兩個函數(shù)
function getXmlHttpRequest() {
??????????? var xmlHttpRequest;
??????????? if(window.ActiveXObject){
??????????????? xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
??????????? }else{
??????????????? xmlHttpRequest = new xmlHttpRequest();
??????????? }
??????????? return xmlHttpRequest;
??????? }
???????
function $(id) {
??????????? return document.getElementById (id);
??????? }
?

轉(zhuǎn)載于:https://blog.51cto.com/5155796/1095475

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