php ajax解决跨越问题

通过设置Access-Control-Allow-Origin来实现跨域访问比较简单。

例如：客户端的域名是www.client.com,而请求的域名是www.server.com

如果直接使用ajax访问，会有以下错误

XMLHttpRequest cannot load http://www.server.com/server.php. No 'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'http://www.client.com' is therefore not allowed access.

在被请求的Response header中加入

 
// 指定允许其他域名访问
 
header('Access-Control-Allow-Origin:*');
 
// 响应类型
 
header('Access-Control-Allow-Methods:POST');
 
// 响应头设置
 
header('Access-Control-Allow-Headers:x-requested-with,content-type');

就可以实现ajax POST跨域访问了。

代码如下：

client.html 路径：http://www.client.com/client.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 
<html>
 
<head>
 
<meta http-equiv="content-type" content="text/html;charset=utf-8">
 
<title> 跨域测试 </title>
 
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
 
</head>
 
<body>
 
<div id="show"></div>
 
<script type="text/javascript">
 
$.post("http://www.server.com/server.php",{name:"fdipzone",gender:"male"})
 
.done(function(data){
 
document.getElementById("show").innerHTML = data.name + ' ' + data.gender;
 
});
 
</script>
 
</body>

</html>

server.php 路径：http://www.server.com/server.php

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

Access-Control-Allow-Origin:* 表示允许任何域名跨域访问

如果需要指定某域名才允许跨域访问，只需把Access-Control-Allow-Origin:*改为Access-Control-Allow-Origin:允许的域名

例如：header('Access-Control-Allow-Origin:http://www.client.com');

如果需要设置多个域名允许访问，这里需要用php处理一下

例如允许 www.client.com 与 www.client2.com 可以跨域访问

server.php 修改为

<?php
 
$ret = array(
 
'name' => isset($_POST['name'])? $_POST['name'] : '',
 
'gender' => isset($_POST['gender'])? $_POST['gender'] : ''
 
);
 
 
header('content-type:application:json;charset=utf8');
 
 
 //$_SERVER['HTTP_ORIGIN']访问者的域名
$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';
 
 
 
$allow_origin = array(
 
'http://www.client.com',
 
'http://www.client2.com'
 
);
 
 
 
if(in_array($origin, $allow_origin)){
 
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);
 
?>