C# ASP.NET MVC 配置允许跨域访问

在web.config文件中的 system.webServer 节点下 增加如下配置

       <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>