php相关问题总结

                    header("Access-Control-Allow-Origin: http://www.abc.com"); //允许指定网站
                    header("Access-Control-Allow-Origin: *");//允许所有网站
                    2.jsonp

  <script type="text/javascript">
    $.ajax({
        dataType: "jsonp",
        url: "http://www.b.com/b.php",
        jsonp: "callback",
        success: function(data) {
            $(".info").text("uid:" + data.uid + " name:" + data.name);
        }      
    });
    </script>
ajax.php文件：
<?php 
$callback = !empty($_GET[&#39;callback&#39;]) ? trim($_GET[&#39;callback&#39;]) : &#39;&#39;; 
if(!empty($callback)) {
    $data = json_encode(array(
        &#39;uid&#39; => 1,
        &#39;name&#39; => &#39;测试&#39;,
    ));   
    echo "{$callback}({$data});";
}