<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script src="new_ajax.js"></script>
<script>
window.onload=function ()
{
var oBtn=document.getElementById('btn1'); oBtn.onclick=function ()
{
ajax('a.txt', function (str){
alert(str);
});
};
};
</script>
</head> <body>
<input id="btn1" type="button" value="读取" />
</body>
</html>
一下是引入的封装好的new_ajax.js
function ajax(url, fnSucc, fnFaild)
{
//1.创建Ajax对象
if(window.XMLHttpRequest) //低版本IE6浏览器
{
var oAjax=new XMLHttpRequest();
}
else
{
var oAjax=new ActiveXObject("Microsoft.XMLHTTP");
} //2.连接服务器
//open(方法, 文件名, 异步传输)
oAjax.open('GET', url, true); //3.发送请求
oAjax.send(); //4.接收返回
oAjax.onreadystatechange=function ()
{
//oAjax.readyState //浏览器和服务器，进行到哪一步了
if(oAjax.readyState==) //读取完成
{
if(oAjax.status==) //成功
{
fnSucc(oAjax.responseText);
}
else
{
if(fnFaild)
{
fnFaild(oAjax.status);
}
//alert('失败:'+oAjax.status);
}
}
};
}