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ajax 基础实例

2024-07-07 03:54:52   224人阅读

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优点：使用ajax读取数据文件，不需要刷新页面就能取出文件数据<br><br><br><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 
    <title></title>
     
<script type="text/javascript">
    function ajax(url, fnSucc, fnFaild) {
        //1.创建Ajax对象
        if (window.XMLHttpRequest) {
            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 == 4)  //读取完成
            {
                if (oAjax.status == 200)    //成功
                {
                    fnSucc(oAjax.responseText);
                }
                else {
                    if (fnFaild) {
                        fnFaild(oAjax.status);
                    }
                    //alert(‘失败:‘+oAjax.status);
                }
            }
        };
    }
    window.onload = function () {
        var oBtn = document.getElementById(‘myDiv‘);
 
        oBtn.onclick = function () {
            ajax(‘test1.txt?t=‘+new Date().getTime(), function (str) { <br>      //?t=‘+new Date().getTime()  可以控制缓存，即每次改变 test1.txt文件不需要刷新页面既可读取文件改变后的值
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var oTxt = document.getElementById(‘txt‘);<br>  oTxt.value = http://www.mamicode.com/str; }); }; };
</script>

<body>
"button" id="myDiv" value=http://www.mamicode.com/"读取"/><br /> <br>用户名: <input type="text" id="txt" /><br> <input type="text" id="Text1" /> <br></body><br> </html>

　　

 


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