webapi跨域请求设置

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http.Filters;
using Newtonsoft.Json;
using System.Text;
using System.Web.Http.Controllers;

namespace Filters
{
    public class Filter : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            if (actionContext.Request.Method.Method == "OPTIONS")
            {//直接通行预请求
                actionContext.Response =
                new HttpResponseMessage { Content = new StringContent(JsonConvert.SerializeObject(new { status =200, message = "OPTION_SSUCCESS" }), Encoding.GetEncoding("UTF-8"), "application/json") };
                OpenCorsing(actionContext);
                base.OnActionExecuting(actionContext);
                return;
            }   

            base.OnActionExecuting(actionContext);
        }

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
            //返回请求结果前 设置一下响应头
            OpenCorsed(actionExecutedContext);
            base.OnActionExecuted(actionExecutedContext);
        }
        public void OpenCorsed(HttpActionExecutedContext actionExecutedContext)
        {
            try
            {
                IEnumerable outvalues;
                if (actionExecutedContext.Request.Headers.TryGetValues("Origin", out outvalues))
                {
                    actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Origin", string.Join(",", outvalues.ToArray()));
                    actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Credentials", "true"); //是否支持cookie跨域
                    //actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Headers", "token");//请求头假如有自定义参数，需要在这里加上允许 eg:"token,key"
                    //actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS");
                }
            }
            catch
            {

            }

        }
        public void OpenCorsing(HttpActionContext actionContext)
        {
            try
            {
                IEnumerable outvalues;
                if (actionContext.Request.Headers.TryGetValues("Origin", out outvalues))
                {
                    actionContext.Response.Headers.Add("Access-Control-Allow-Origin", string.Join(",", outvalues.ToArray()));
                    actionContext.Response.Headers.Add("Access-Control-Allow-Credentials", "true"); //是否支持cookie跨域
                    //actionContext.Response.Headers.Add("Access-Control-Allow-Headers", "token");//请求头假如有自定义参数，需要在这里加上允许 eg:"token,key"
                    //actionContext.Response.Headers.Add("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS");
                }
            }
            catch 
            {
            }

        }
    }
}

页面jq请求

<script type="text/javascript">
    jQuery.support.cors = true;//此处解决ie问题
    $(function () {
        $("#btn").click(function () {
            $.ajax({
                url: "http://192.168.1.16/myApiTest/v1/LogOut",
                data: {},
                type: "post",
                dataType: "json",
                xhrFields: {
                    withCredentials: true//这个属性设置为true
                },
                beforeSend: function (request) {
                    request.setRequestHeader("token", "abc");//自定义请求头参数
                },
                success: function (data) {

                }
            });
        });  
    });
script>