跨域访问

1.ajax的jsonp格式

        $.ajax({ 

            type : "GET", 

            url : "http://127.0.0.1/raid/jquery_learning/ajax_learning/php/index.php?number="+$("#keyword").val(), 

            dataType : "jsonp", 

            jsonp : "callback", 

            success : function(data) { 

                    if (data.success) { 

                            $("#searchResult").html(data.msg); 

                    } else { 

                            $("#searchResult").html("出现错误"+data.msg); 

                    } 

            }, 

            error : function(jqXHR) { 

                    alert("发生错误"+jqXHR.status); 

            } 

       }) 

2.html的

        header("Access-Control-Allow-Method:POST,GET");

        header("Access-Control-Allow-Origin: *");

3.多个地址跨域访问

        //跨域访问的时候才会存在此字段 

        $origin = isset($_SERVER['HTTP_ORIGIN']) ? $_SERVER['HTTP_ORIGIN'] : '';   

        $allow_origin = array(   

            'http://www.a.com',   

            'http://www.b.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');   

        }