Facebook Javascript SDK未被捕获TypeError:无法读取未定义的属性"userID"

Question

我正在尝试使用Facebook JavaScript SDK实现授权功能.当我运行它时,检查控制台我看到错误.

uncaught TypeError: Cannot read property 'userID' of undefined 

代码段

<div id="fb-root"></div>
<!-- Load the Facebook JavaScript SDK -->
<script src="//connect.facebook.net/en_US/all.js"></script>
<script>
var appId = 'APP_ID';
var uid;

// Initialize the JS SDK
FB.init({
 appId: '413026618765431',
 cookie: true,
});

// Get the user's UID
FB.getLoginStatus(function(response) {
 uid = response.authResponse.userID ? response.authResponse.userID : null;
});

function authUser() {
 FB.login(function(response) {
   uid = response.authResponse.userID ? response.authResponse.userID : null;
 }, {scope:'email,publish_actions'});
}
</script>

Answer 1

如果应用程序未经授权，则响应对象将不包含authResponse属性 - 因此会出现您看到的错误。

你想要的是

uid = response.authResponse 
  ? response.authResponse.userID 
  : null;

或者简单地

uid = response.authResponse && response.authResponse.userID || null;

或者简单地

uid = response.authResponse && response.authResponse.userID;