从公共方法调用模块的私有函数

Question

此流星代码尝试调用send函数，但服务器报告错误“send is not defined”，并且如果将罪魁祸首行更改为request.send，则得到Object没有方法发送。

为什么以及如何解决它？由于

request = (function() { 
    const paths = {logout: {method: 'GET'}} 
    const send =() => {some code} 

    return { 
    registerRequestAction: (path, func) => { 
     paths[path].action = func; 
    }, 
    invoke: (type) => { 
    paths[type].action(); 
    }  
    } 

    }()); 

request.registerRequestAction('logout',() => { 
send(); // send is not defined 
request.send(); // object has no method send 

}); 

request.invoke('logout'); // to fire it up 

Answer 1

你没有参考返回一个匿名对象发送方法：

// this isn't visible from the outside 
    const send =() => {some code} 

    // this is visible from the outside, 
    // but with no reference to send() 
    return { 
    registerRequestAction: (path, func) => { 
     paths[path].action = func; 
    }, 
    invoke: (type) => { 
    paths[type].action(); 
    }  
    } 

做这样的事情应该解决您的问题：

return { 
    registerRequestAction: (path, func) => { 
      paths[path].action = func; 
    }, 
    invoke: (type) => { 
     paths[type].action(); 
    }, 
    // expose send to the outside 
    send: send 
} 

request.registerRequestAction('logout',() => { 
    request.send(); 
});