/// <summary>
 /// 用qq登录,跳转到腾讯提供的登录页面
 /// </summary>
 /// <returns></returns>
 public ActionResult Login()
 {
     //return JavaScript("<script>alert('hello');</script>");
     QzoneContext context = new QzoneContext(appid, appkey);
     string cbUrl = "/qq/callback";
     OAuthToken token = context.GetRequestToken(cbUrl);
     TempData["TokenKey"] = token.TokenKey;
     TempData["TokenSecret"] = token.TokenSecret;
     string authUrl = context.GetAuthorizationUrl(token, cbUrl);
     return Redirect(authUrl);
 }