AngulaJs+Web Api Cors 跨域访问失败的解决办法

//在服务的WebConfig文件中添加以下代码即可 

//如节点已存在请去掉

 <system.webServer>　　
    <httpProtocol>

      <customHeaders>
       <add name="Access-Control-Allow-Origin" value="*" />
         <add name="Access-Control-Allow-Methods" value="POST" />
         <add name="Access-Control-Allow-Headers" value="content-type" />
      </customHeaders>

   </httpProtocol>
  </system.webServer>