ajax 简单例子

Html 代码：

<html>

<body>

<div id="myDiv"><h3>Let AJAX change this text</h3></div>

<button type="button" onclick="loadXMLDoc()">Change Content</button>

</body>

</html>

js代码：

<script type="text/javascript">

    var xmlhttp;

    function loadXMLDoc() {

        //ajax script goes here...

        if(window.XMLHttpRequest) {

            //code for IE7+, firefox, Chrome, Opera,Sarari

            xmlhttp =  new XMLHttpRequest();

        }else {

            //code for IE6,IE5

            xmlhttp =  new ActiveXObject("Microsoft.XMLHTTP");

        }

        if(xmlhttp != null) {

            //创建响应XMLHttpRequest对象状态变化的函数

            xmlhttp.onreadystatechange = httpStateChange;

            //创建http请求

            xmlhttp.open('GET', 'json/data.json', true);

            //发送http请求

            xmlhttp.send(null);

        }

    }

    function httpStateChange() {

        console.log(xmlhttp.readyState, xmlhttp.status);

        //请求中.

        if(xmlhttp.readyState == 1) {

            //loading..

            document.getElementById('myDiv').innerHTML = 'loading..';

        }

        ////异步调用完毕

        if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {

            var data = JSON.parse(xmlhttp.responseText);

            console.log(data);

           document.getElementById('myDiv').innerHTML = data.sites[1].Name;

        }

    }

</script>

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ajax 简单例子

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