CORS跨域请求与JSONP跨域请求

1、CORS跨域请求

代码示例

前端

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>跨域请求</button>
    <h3 style="color: blueviolet;"></h3>
    <script>
        var btn = document.querySelector("button");
        btn.onclick = function(){
            var xhr = new XMLHttpRequest();
            xhr.onreadystatechange = function(){
                if(xhr.readyState === 4 && xhr.status === 200){
                    console.log(xhr.responseText);
                    document.querySelector("h3").innerHTML=xhr.responseText;
                }
            };
            xhr.open("get","http://www.qwe.demo/test.php",true);
            xhr.send(null);
        }
    </script>
</body>
</html>

后端

<?php
header('Access-Control-Allow-Origin:http://www.php11.demo');
echo "跨域脚本返回的数据";
flush();
?>

2、JSONP跨域请求

代码示例

前端

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>跨域请求-JSONP</button>
    <script>
        function handle(jsonData){
        console.log(jsonData);
        var data = JSON.parse(jsonData);
        console.log(data);
        var ul = document.createElement('ul');
            ul.innerHTML += "<li>" + data.title + "</li>";
            ul.innerHTML += "<li>姓名：" + data.user.name + "</li>";
            ul.innerHTML += "<li>邮箱：" + data.user.email + "</li>";
            document.body.appendChild(ul);
    }
        var btn = document.querySelector("button");
        btn.onclick = function(){
            var script = document.createElement('script');
                script.src = "http://www.qwe.demo/test1.php?jsonp=handle&id=1";
                document.head.appendChild(script);
        }
    </script>
</body>
</html>
<script>
</script>

后端

<?php
header('content-type:text/html;charset=utf-8');
$callback = $_GET['jsonp'];
$id = $_GET['id'];
$users = [
    0=>'{"name":"zcx","email":"zcx@qq.com"}',
    1=>'{"name":"zxc","email":"zxc@qq.com"}',
    2=>'{"name":"cxz","email":"cxz@qq.com"}'
];
if(array_key_exists(($id-1),$users)){
   $user = $users[$id-1];
}
$json = '{
    "title":"用户信息",
    "user": '.$user.'
}';
echo $callback .'('.json_encode($json).')';
?>

学习总结

本节课我们学习了CORS跨域请求与JSONP跨域请求的知识，通过本节课的学习使我知道如何进行跨域请求，希望通过后续的学习应用于实际开发中。

1、CORS跨域请求

代码示例

2、JSONP跨域请求

代码示例

学习总结

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