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1. negut引用：MIcrosoft.AspNet.WebApi.Cors
2. 添加配置如下：webapi网站就可以解决跨域问题

全局配置

public static class WebApiConfig{
       public static void Register(HttpConfiguration config)    {
           config.EnableCors(new EnableCorsAttribute("*", "*", "*"));//全部都允许，    }}

方法配置

[EnableCors(origins: "http://localhost:9099/", headers: "*", methods: "GET,POST,PUT,DELETE")]public Users GetUserByID(){
   }

行为特性配置跨域

public class CustomActionFilterAttribute : ActionFilterAttribute{
       public override void OnActionExecuting(HttpActionContext actionContext)    {
       }    public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)    {
           actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Origin", "*");    }}

注意点

//microsoft.aspnet.webapi.corsjQuery.support.cors = true;var location = "http://localhost:8088";$("#btnGetCors1").on("click", function () {
       $.ajax({
    url: location + "/api/users/GetUserByID", type: "get", data: {
    "id": 1 }, success: function (data) {
    alert(data); }, datatype: "json" });});

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