Ajax同源和跨域

ajax跨域访问

客户端页面

var url = "http://172.16.91.121:81/FellIn/FellIn.aspx?Action=WXSave&WX_StoreID=" + $("#WX_StoreID").val() + "&WX_UserID=" + UserID;
        $.ajax(
        {
            type: "get",
            url: url,
            dataType: 'jsonp',
            jsonp: "callbackparam",
            jsonpCallback: "callbackparam",
            success: function (data) {
               
            },
            error: function () {
                $("#fi_NO").val("查询失败");
                $("#fi_Code").val("查询失败");
                $("#fi_WaitingNum").val("查询失败");
            }
        });

function callbackparam(parameters) {
        $("#fi_NO").val(parameters[0].fi_NO);
        $("#fi_Code").val(parameters[0].fi_Code);
        $("#fi_WaitingNum").val(parameters[0].fi_WaitingNum);
    }

 

服务器端：

Response.ContentType = "text/plain";

var callbackFunName = context.Request["callbackparam"];
httpContext.Response.Write(callbackFunName +"("); //callbackFunName 为上文中的callbackparam

httpContext.Response.Write(Data);          //Data 是服务器返回的数据   就是json格式     

httpContext.Response.Write(");");        //记得括号

 

正常同源ajax：

$.ajax({
            url: 'Store_Info.ashx',
            type: "GET",
            traditional: true,
            success: function (date) {
                returnData = $.parseJSON(date);
                set();
            }
        });