用ajax连接mysql_页面用ajax实现简单的连接数据库

(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);

}