webservice跨域问题

在webconfig里面加上

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