vue +asp.net core webapi跨域

using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;
using System.Text;
using System.Security.Cryptography;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
namespace WebApplication2.Controllers
{
[ApiController]
[Route("api/[controller]/[action]")]
public class WeatherForecastController : ControllerBase
{
private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};

private readonly ILogger<WeatherForecastController> _logger;

public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
_logger = logger;
}

[HttpGet]
public IEnumerable<WeatherForecast> Get()
{
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateTime.Now.AddDays(index),
TemperatureC = Random.Shared.Next(-20, 55),
Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray();
}

[HttpPost]
public string Login([FromBody] UserModel userModel)
//public string Login(string userName, string password)
{
//var Permission = "Permission";
var userId = "1";
//验证用户名密码
//创建JWT
// header
var signingAlgorithm = SecurityAlgorithms.HmacSha256;
// payload
var claims = new List<Claim>
{
new Claim(JwtRegisteredClaimNames.Sub,userId),
};
var secretByte = Encoding.UTF8.GetBytes("dengfenglaiSecretKey");

var signingKey = new SymmetricSecurityKey(secretByte);
var signingCredentials = new SigningCredentials(signingKey, signingAlgorithm);

var token = new JwtSecurityToken(
//颁发者
issuer: "dengfneglai", //_configuration["Authentication:Issuer"],
//接收者
audience: "zhuifengqu", //_configuration["Authentication:Audience"],
//自定义参数
claims,
notBefore: DateTime.UtcNow,
//过期时间
expires: DateTime.UtcNow.AddDays(1),
//签名证书
signingCredentials
);
var tokenStr = new JwtSecurityTokenHandler().WriteToken(token);
return tokenStr;

//return "哈哈哈";

}

[Serializable]
public class UserModel
{
public string username { get; set; }
public string password { get; set; }

}

public class JWTTokenOptions
{
public string Audience { get; set; }
public string SecurityKey { get; set; }
public string Issuer { get; set; }
}

}

public interface ICustomJWTService
{
string GetToken(string UserName, string PassWord);
}
}

Program.cs代码

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();

builder.Services.AddCors(options =>
options.AddPolicy("cors",
p => p.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod().AllowCredentials()));
var app = builder.Build();

// Configure the HTTP request pipeline.

app.UseAuthorization();

app.MapControllers();

app.Run();