原生Ajax 和jQuery Ajax的区别示例分析

2019-11-20 13:40:57

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　　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：

复制代码代码如下:

<!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：

复制代码代码如下:

<?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：

复制代码代码如下:

<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>