Detecting an Ajax request in PHP

1:index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
    .btn{ border: 1px green solid; background-color:green;border-radius: 3px; width: 200px; height:30px;}
    </style>
    <script type="text/javascript" src="../../js/jquery.js"></script>
    <script type="text/javascript">
    $(function(){
        $('input:button').click(function(){
        $.get(
            'check.php',
            function(data){
            $('#info').html(data);        
            }
        );    
        });    
    }); 
    </script>
</head>
<body>
    <h1>Detecing Ajax Request</h1>
    <input type="button" value="Load Some data" class="btn"/>
    <div id="info"></div>
</body>
</html>

2:check.php

<?php
    if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
    $_SERVER['HTTP_X_REQUESTED_WITH']=='XMLHttpRequest'){
    echo 'Request Successful!';    
    }else{
    echo 'This is not an ajax request!';    
    }
?>

相关阅读:
JS流程控制语句
JS操作符
JS数据类型
JS基础语法与JS变量
CSS案例1（导航栏）
CSS三大特性
CSS——背景，渐变和列表
HTML+CSS项目——模拟京东网页
JavaScript简介
js -04课程更换背景图片

原文地址：https://www.cnblogs.com/yshyee/p/3388345.html