如何请求权限与谷歌+徽章API

我正在使用Google+徽章API来获得追随者和+1。此外，我有使用Google+ Signin API的登录按钮。当我使用登录按钮登录时，它会询问电子邮件权限。但是，当我想跟随或+1谷歌+页面它要求我登录，从不要求权限。

    <html>
<head>
  <title>Demo: Getting an email address using the Google+ Sign-in button</title>
  <style type="text/css">
  .hide { display: none;}
  .show { display: block;}
  </style>
  <script src="https://apis.google.com/js/plusone.js" type="text/javascript"></script>
  <script type="text/javascript">
  /*
   * Triggered when the user accepts the the sign in, cancels, or closes the
   * authorization dialog.
   */
  function loginFinishedCallback(authResult) {
    if (authResult) {
      if (authResult['error'] == undefined){
        gapi.auth.setToken(authResult); // Store the returned token.
        toggleElement('signin-button'); // Hide the sign-in button after successfully signing in the user.
        getEmail();                     // Trigger request to get the email address.
      } else {
        console.log('An error occurred');
      }
    } else {
      console.log('Empty authResult');  // Something went wrong
    }
  }
  /*
   * Initiates the request to the userinfo endpoint to get the user's email
   * address. This function relies on the gapi.auth.setToken containing a valid
   * OAuth access token.
   *
   * When the request completes, the getEmailCallback is triggered and passed
   * the result of the request.
   */
  function getEmail(){
    // Load the oauth2 libraries to enable the userinfo methods.
    gapi.client.load('oauth2', 'v2', function() {
          var request = gapi.client.oauth2.userinfo.get();
          request.execute(getEmailCallback);
        });

    // This sample assumes a client object has been created.
    // To learn more about creating a client, check out the starter:
    //  https://developers.google.com/+/quickstart/javascript
    gapi.client.load('plus','v1', function(){
     var request = gapi.client.plus.people.list({
       'userId': 'me',
       'collection': 'visible'
     });
     request.execute(function(resp) {
       console.log('Num people visible:' + resp.totalItems);
     });
    });
    // This sample assumes a client object has been created.
    // To learn more about creating a client, check out the starter:
    //  https://developers.google.com/+/quickstart/javascript
    gapi.client.load('plus','v1', function(){
     var request = gapi.client.plus.people.get({
       'userId': 'me'
     });
     request.execute(function(resp) {
       console.log('Retrieved profile for:' + resp.displayName);
       console.log(resp);
     });
    });
   }


  function getEmailCallback(obj){
    var el = document.getElementById('email');
    var email = '';
    if (obj['email']) {
      email = 'Email: ' + obj['email'];
    }
    //console.log(obj);   // Uncomment to inspect the full object.
    el.innerHTML = email;
    toggleElement('email');
  }
  function toggleElement(id) {
    var el = document.getElementById(id);
    if (el.getAttribute('class') == 'hide') {
      el.setAttribute('class', 'show');
    } else {
      el.setAttribute('class', 'hide');
    }
  }
  </script>
</head>
<body>
  <div id="signin-button" class="show">
     <div class="g-signin" data-callback="loginFinishedCallback"
      data-clientid="MY_CLIENT_ID"
      data-scope="https://www.googleapis.com/auth/plus.login https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email"
      data-height="short"
      data-cookiepolicy="single_host_origin"
      >
    </div>
  </div>
<!-- Place this tag where you want the badge to render. -->
<div class="g-plus" data-width="210" data-href="//plus.google.com/MY_PAGE_ID" data-rel="publisher" data-theme="dark"></div>
  <div id="email" class="hide"></div>
</body>
</html>

是否有一种方法，我可以问用户的权限，当他们使用跟随和+1按钮登录?

另外，如果用户将他/她的个人资料字段(如生日)隐私设置为"ONLY ME"，那么我可以请求这些字段吗?如果是，怎么做?

1-没有徽章API

2-你应该区分-使用谷歌的功能，如徽章或+1按钮，这需要用户登录到Google+-使用你的服务的功能，如登录按钮，这需要用户连接他们的Google+帐户到你的服务

简而言之，用户必须登录到Google+(它不需要任何权限，因为Google+是身份提供者)和连接到你的服务/站点/应用程序，这需要他们给你的权限。

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