配置跨域

 <system.webServer>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Access-Control-Allow-Origin, AppKey, Authorization" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, OPTIONS" />
        <add name="Access-Control-Request-Methods" value="GET, POST, OPTIONS" />
      </customHeaders>
    </httpProtocol>
 </system.webServer>