react-native：嵌套回调如何绑定方法

Question

嵌套回调函数我尝试过使用箭头函数，绑定函数，但功能没有触发后得到Facebook访问令牌我需要调用API与this.handleApiCalls这里我的代码片断

const FBSDK = require('react-native-fbsdk') 
const { 
    LoginButton, 
    AccessToken 
} = FBSDK 

class LoginScreen extends React.Component { 
     constructor() { 
      super(props) 
     } 

     handleApiCalls =() => { 
      alert("handle the api calls"); 
     } 

    render() { 
    return <View style={{justifyContent: 'center', 
      alignItems: 'center'}}> 
          <LoginButton 
           publishPermissions={['publish_actions']} 
           onLoginFinished={ 
    // first call back 
            (error, result) => { 
             if (error) { 

             console.log('error:', error); 
             } else if (result.isCancelled) { 
             alert('login is cancelled.') 
             console.log('login is cancelled:', result); 
             } else { 
    // second callback 

    AccessToken.getCurrentAccessToken().then((data) => { 
     console.log('Access_Token:'+data.accessToken.toString()) 

    // ================ how to call this function =============== 
     this.handleApiCalls 

     }) 


             } 
            } 
            } 
          onLogoutFinished={() => alert('logout.')}/> 
         </View> 
     } 

} 

Answer 1

如果console.log('Access_Token:'+data.accessToken.toString())工作则只是改变this.handleApiCalls到this.handleApiCalls()来调用它。