cors跨域 web.config配置

  <system.webServer>   

 <httpProtocol>

      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="*" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE" />
      </customHeaders>
    </httpProtocol>

  </system.webServer>

这种支持所有路径的调用