登录后“登录LinkedIn”按钮消失

我的目标是为3大（Fb，LinkedIn，Twitter）实现社交登录按钮，并使用从社交（电子邮件，名字，姓氏）中捕获的数据来预填填着陆页面内的表单 .

我已使用以下代码实现了“使用LinkedIn登录”按钮：

<script type="text/javascript" src="http://platform.linkedin.com/in.js">
  api_key: {my api_key}
      onLoad: onLinkedInLoad
    authorize: true
</script>

   <script type="text/javascript">
function onLinkedInLoad() {
  IN.Event.on(IN, "auth", function() {onLinkedInLogin();});
  IN.Event.on(IN, "logout", function() {onLinkedInLogout();});
}

function onLinkedInLogout() {
  setLoginBadge(false);
}

function onLinkedInLogin() {
  // we pass field selectors as a single parameter (array of strings)
  IN.API.Profile("me")
    .fields("firstName", "lastName", "industry", "location:(name)", "picture-url", "headline", "summary", "num-connections", "public-profile-url", "distance", "positions", "email-address", "educations", "date-of-birth")
    .result(function(result) {
      setLoginBadge(result.values[0]);
    })
    .error(function(err) {
      alert(err);
    });
}

function setLoginBadge(profile) {
  if (!profile) {
    profHTML = "<p>You are not logged in</p>";
  }
  else {
    var pictureUrl = profile.pictureUrl || "http://static02.linkedin.com/scds/common/u/img/icon/icon_no_photo_80x80.png";
  alert( profile.firstName);
  alert( profile.lastName);
   alert(profile.emailAddress);

      $("#field0").val(profile.firstName);
      $("#field1").val(profile.lastName);
      $("#field2").val(profile.emailAddress);
      $("#field3").val(profile.emailAddress);

     profHTML = "<p><a href=\"" + profile.publicProfileUrl + "\">";
    profHTML = profHTML + "<img align=\"baseline\" src=\"" + pictureUrl + "\"></a>";      
    profHTML = profHTML + "&nbsp; Welcome <a href=\"" + profile.publicProfileUrl + "\">";
    profHTML = profHTML + profile.firstName + " " + profile.lastName + "</a>! <a href=\"#\" onclick=\"IN.User.logout(); return false;\">logout</a></p>";
  }
  document.getElementById("loginbadge").innerHTML = profHTML;
}
</script>

    //LinkedIn Button


<script type="IN/Login">


  <input type="hidden" id="fnameLinkedIn" name="linkedin-id" value="<?js= firstName ?>" />
  <input type="hidden" id="lnameLinkedIn" name="linkedin-id" value="<?js= lastName ?>" />

  </script>

代码有效，但当我使用LinkedIN登录时，“使用LinkedIn登录”按钮消失 . 登录后我会保留LinkedIn按钮 .

如何避免LinkedIn按钮的消失？

谢谢你的支持 .

亚历克斯