ASP.NET WEB.CONFIG配置允许跨域

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <!-- 其他配置 -->
  </system.web>
  <system.webServer>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
    </httpProtocol>
    <!-- 其他配置 -->
  </system.webServer>
</configuration>