Web Facebook Login 脸书登录验证

ref:https://developers.facebook.com/docs/facebook-login/web#logindialog

具体内容见官方文档，这边直接上代码及测试结果

<!DOCTYPE html>
<html>
<head>
<title>Facebook Login JavaScript Example</title>
<meta charset="UTF-8">
</head>
<body>
<script>

  function statusChangeCallback(response) {  // Called with the results from FB.getLoginStatus().
    console.log('statusChangeCallback');
    console.log(response);                   // The current login status of the person.
    if (response.status === 'connected') {   // Logged into your webpage and Facebook.
      testAPI();  
    } else {                                 // Not logged into your webpage or we are unable to tell.
      document.getElementById('status').innerHTML = 'Please log ' +
        'into this webpage.';
    }
  }


  function checkLoginState() {               // Called when a person is finished with the Login Button.
    FB.getLoginStatus(function(response) {   // See the onlogin handler
      statusChangeCallback(response);
    });
  }

//STEP1: Load the SDK asynchronously
//STEP2: Init the SDK upon load
  window.fbAsyncInit = function() {
    FB.init({
      appId      : '{app-id}',
      cookie     : true,                     // Enable cookies to allow the server to access the session.
      xfbml      : true,                     // Parse social plugins on this webpage.
      version    : '{api-version}'           // Use this Graph API version for this call.
    });


    FB.getLoginStatus(function(response) {   // Called after the JS SDK has been initialized.
      statusChangeCallback(response);        // Returns the login status.
    });
  };
 
  function testAPI() {                      // Testing Graph API after login.  See statusChangeCallback() for when this call is made.
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log('Successful login for: ' + response.name);
      document.getElementById('status').innerHTML =
        'Thanks for logging in, ' + response.name + '!';
    });
  }

</script>


<!-- The JS SDK Login Button -->

<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
</fb:login-button>

<div id="status">
</div>

<!-- Load the JS SDK asynchronously -->
<script async defer crossorigin="anonymous" src="https://connect.facebook.net/en_US/sdk.js"></script>
</body>
</html>

如果已经登录了，测试结果如下：

 

 

 注意异步加载JS SDK的写法有两种，法一如上：

<!-- Load the JS SDK asynchronously -->
<script async defer crossorigin="anonymous" src="https://connect.facebook.net/en_US/sdk.js"></script>

 

法二，如下代码

  (function (d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s);
        js.id = id;
        js.src = "https://connect.facebook.net/en_US/sdk.js";//"https://connect.facebook.net/en_US/sdk/debug.js";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'fb-jssdk'));

其实就是生成如下元素

 

posted @ 2021-12-16 17:48  katesharing  阅读(2281)  评论(0)  编辑  收藏  举报