原生Ajax 和Jq Ajax

　　前言：这次介绍的是利用ajax与后台进行数据交换的小例子，所以demo必须通过服务器来打开。服务器环境非常好搭建，从网上下载wamp或xampp，一步步安装就ok，然后再把写好的页面放在服务器中指定的位置。打开时，在浏览器地址栏输入“localhost/指定页面”或者“127.0.0.1/指定页面”打开。

　　下面列出demo的HTML、PHP、原生ajax 、jq ajax代码。

　　HTML代码：

<!doctype html>

<html>

<head>

    <title>ajax示例</title>

    <meta charset='utf-8' />

    <link rel="stylesheet" type="text/css" href="css/common.css" />

    <style type="text/css">

        .main{height:400px;width:800px;margin:100px auto 0;border:1px solid #000;}

        .list{height:400px;width:200px;float:left;background:#ddd;}

        .inf{height:400px;width:600px;float:right;background:#ccc;text-align:center;}

        .list li{width:200px;text-align:center;margin:50px 0 0;font-size:24px;cursor: pointer;

        }

        .inf img{width:360px;height:270px;margin:15px auto;}

        .inf p{width:580px;text-align:left;text-indent:2em;font-size:14px;margin:0 10px;}

    </style>

</head>

<body>

    <div class='main'>

        <div class='list' id='list'>

            <ul>

                <li name='spring' id='spring'>春</li>

                <li name='summer' id='summer'>夏</li>

                <li name='fall' id='fall'>秋</li>

                <li name='winter' id='winter'>冬</li>

            </ul>

        </div>

        <div class='inf' id='inf'>

        <!--要插入的内容-->

        </div>

    </div>

</body>

<script type="text/javascript" charset="utf-8" src="js/jQuery.js"></script>

</html>

　　PHP代码：

<?php

$details = array (

    'spring'    =>    "<img src='images/spring.jpg' alt='' /><p>人间四月芳菲尽，山寺桃花始盛开</p>",

    'summer'    =>    "<img src='images/summer.jpg' alt='' /><p>水晶帘动微风起，满架蔷薇一院香</p>",

    'fall'    =>    "<img src='images/fall.jpg' alt='' /><p>金井梧桐秋叶黄，珠帘不卷夜来霜</p>",

    'winter'        =>    "<img src='images/winter.jpg' alt='' /><p>梅须逊雪三分白，雪却输梅一段香</p>"

);

echo $details[$_REQUEST['LiName']];

?>

　　原生ajax：

<script type="text/javascript">

    var lis = document.getElementById('list').getElementsByTagName('li');

    window.onload = initPage;

    function initPage() {

        for (var i=0; i<lis.length; i++) {

            txt = lis[i];

            txt.onclick = function () {

                getDetails(this.id);

            }

        }

    }

    function creatRequest() {

        try {

            request = new XMLHttpRequest();

        }

        catch (tryMS) {

            try {

                request = new ActiveXObject("Msxml2.XMLHTTP");

            }

            catch (otherMS) {

                try {

                    request = new ActiveXObject("Miscrosoft.XMLHTTP");

                }

                catch (failed) {

                    request = null;

                }

            }

        }

        return request;

    }

    function getDetails(itemName) {

        request = creatRequest();

        if (request == null) {

            alert('没有成功创建请求')

            return;

        }

        var url = "getDetails.php?LiName="+escape(itemName);

        request.open("GET",url,true);

        request.onreadystatechange = displayDetails;

        request.send(null);

    }

    function displayDetails() {

        if (request.readyState == 4) {

        if (request.status == 200) {

            detailDiv = document.getElementById("inf");

            detailDiv.innerHTML = request.responseText;

        }

      }

    }

</script>

　　JQ ajax:

<script type="text/javascript">

$('#list li').click ( function () {

        $.ajax({

            type:'GET',

            data:'',

            url:"getDetails.php?LiName="+this.id,

            success:function(data){

                $('#inf').html(data);

            },

            dataType:'text',

            error:function (){

                alert("失败！");

            }

        })

    });

</script>

来自：http://www.cnblogs.com/duanhuajian/archive/2012/10/20/2731840.html

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原生Ajax 和Jq Ajax

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