C#WebService 出现No ‘Access-Control-Allow-Origin’ header is present on the requested resource
解决方案是
在web.config里面进行如下配置。
<system.webServer>

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

</system.webServer>
就能解决跨域问题