如何使用Ajax jsonp将数据从一个域传输到另一个域？

Question

例如：我的网站网址为"http://localhost:54887/CustomOrdering.html"但我想从另一个网站"http://localhost:27746/Orders.aspx"获取数据。为此，我在CustomOrdering.html写道

function SessionLogin() {                    
                $.ajax({
                    type: "GET",
                    dataType: "jsonp",
                    contentType: "application/json",
                    async: false,
                    url: 'http://localhost:27746/Orders.aspx/SessionLogin',                       
                    success: function (msg) {
                    },
                    error: function (jqXHR, textStatus, errorThrown) {
                        alert(errorThrown);
                    }
                }); 
            }     

在Orders.aspx中

 public  void SessionLogin()
    {
        HttpContext.Current.Response.ContentType = "application/json";
        string qs = HttpContext.Current.Request.QueryString["callback"];
        HttpContext.Current.Response.Write(qs+ "( [{ \"x\": 10, \"y\": 15}] )");
    }

我收到错误jQuery11110002214477863162756_1449484451326 was not called在控制台中显示错误消息“未捕获的SyntaxError：意外的令牌<”，然后单击它指向Orders.aspx设计页面开始” 错误图像

Answer 1

另一个服务器需要使用给定的回调名称包装返回值：

 public  void SessionLogin()
    {
        HttpContext.Current.Response.ContentType = "application/json";
        string qs = HttpContext.Current.Request.QueryString["callback"];
        HttpContext.Current.Response.Write( qs + "( [{ \"x\": 10, \"y\": 15}] )");
    }