.net ajax跨域请求问题

</system.codedom>
    <system.webServer>
        <defaultDocument>
            <files>

</system.codedom>
    <system.webServer>
        <defaultDocument>
            <files>
                <add value="index.aspx" />
            </files>
        </defaultDocument>

      
      <httpProtocol>
        <customHeaders>
          <add name="Access-Control-Allow-Methods" value="OPTIONS,POST,GET"/>
          <add name="Access-Control-Allow-Headers" value="x-requested-with"/>
          <add name="Access-Control-Allow-Origin" value="*" />
        </customHeaders>
      </httpProtocol>

    </system.webServer>

                <add value="index.aspx" />
            </files>
        </defaultDocument>

      
      <httpProtocol>
        <customHeaders>
          <add name="Access-Control-Allow-Methods" value="OPTIONS,POST,GET"/>
          <add name="Access-Control-Allow-Headers" value="x-requested-with"/>
          <add name="Access-Control-Allow-Origin" value="*" />
        </customHeaders>
      </httpProtocol>

    </system.webServer>

直接在Web.config加上这个就可以了，这个bug弄了我一天

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