ajax跨域问题

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两个不同域名的程序在处理ajax的时候肯定会有跨域的存在，一种方式是通过jsonp，一种是通过请求本域名，然后后端PHP转发curl，还有一种比较简单通过header头来实现，例如

现在有两个域名 www.host1.com 和 www.host2.com 在host1.com下面请求host2.com下面的Php文件。

例如 http://www.host1.com/index.html中这样写

<!DOCTYPE HTML><html lang="en-US"><head>    <meta charset="UTF-8">    <title></title>    <script src="http://cdn.bootcss.com/jquery/2.2.4/jquery.js"></script></head><body>    <script type="text/javascript">        $(function(){            $.post("http://www.host2.com/test.php",{"name":"lizhaoyao","sex":"man"},function(res){                console.log(res);            },"json");        });    </script></body></html>

一个很简单的ajax请求，传送 name 和sex 给 http://www.host2.com/test.php 该文件这样写

<?php$ret = array(      'name' => isset($_POST['name'])? $_POST['name'] : '',      'sex' => isset($_POST['sex'])? $_POST['sex'] : ''  );  echo json_encode($ret); ?>

然后通常情况下会出现一个跨域提醒

XMLHttpRequest cannot load http://www.host2.com/test.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access. The response had HTTP status code 404.

然后我们可以加一段代码

$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';
header('content-type:application:json;charset=utf8');
header('Access-Control-Allow-Origin:'.$origin);
header('Access-Control-Allow-Methods:POST');
header('Access-Control-Allow-Headers:x-requested-with,content-type');

如图：

<?php$ret = array(      'name' => isset($_POST['name'])? $_POST['name'] : '',      'sex' => isset($_POST['sex'])? $_POST['sex'] : ''  );  $origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';  header('content-type:application:json;charset=utf8');  header('Access-Control-Allow-Origin:'.$origin);  header('Access-Control-Allow-Methods:POST');  header('Access-Control-Allow-Headers:x-requested-with,content-type');    echo json_encode($ret);  exit();

再看效果

xhr请求成功！

转自 http://www.cnblogs.com/lizhaoyao/p/5888968.html

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