在webconfig里加入如下配置即可：

<system.webServer>

  <httpProtocol>

   <customHeaders>

<add name="Access-Control-Allow-Origin" value="*" />

<add name="Access-Control-Allow-Methods" value="POST" />

<add name="Access-Control-Allow-Headers" value="content-type" />

   </customHeaders>

  </httpProtocol>

</system.webServer>