(1)写发送代码
var myXmlHttpRequest = "";
myXmlHttpRequest = getXmlHttpRequest();
if (myXmlHttpRequest) { //xmlHttpRequest创建成功了,才能发送请求
//地址一定要写正确
var url = "../zhuCe/zhuCeYanZheng.aspx?username=" + $('Text1').value;
myXmlHttpRequest.open("get",url,true);
myXmlHttpRequest.onreadystatechange = getData;
myXmlHttpRequest.send(null);
}
(2)写接受数据代码:
function getData() {
if((myXmlHttpRequest.readyState == 4) && (myXmlHttpRequest.status == 200)){
//alert("nihao");
var returnMessage = myXmlHttpRequest.responseText;
//alert(returnMessage);
if (returnMessage == "用户名不正确"){
alert("aaa");
}
}
}
(3)另外需要加两个函数
function getXmlHttpRequest() {
var xmlHttpRequest;
if(window.ActiveXObject){
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}else{
xmlHttpRequest = new xmlHttpRequest();
}
return xmlHttpRequest;
}
function $(id) {
return document.getElementById (id);
}