为什么在别的主机上调用某个主机写的C#的web service，没有'调用'按钮

<span style="color: rgb(51, 51, 51); font-family: Helvetica, Tahoma, Arial, sans-serif; font-size: 14px; line-height: 24px; background-color: rgb(245, 245, 245); ">在 web.config 的 <system.web> 节中添加以下代码即可，感谢小鹏同志指点：</span>

 <webServices>  <protocols>   <add name="HttpGet" />   <add name="HttpPost" />   <add name="HttpPostLocalhost" />   <add name="Documentation" />  </protocols> </webServices>