node.js - typescript express 中间件

Question

我有一个简单的 express 身份验证中间件。它检查标题，如果一切正常，它调用 next()

现在当我在“DoSomething”时，“this”等于全局而不是“Test”的实例并且 “this.DoSomeThingPrivate”未定义。

我试过了

DoSomeThingPrivate :() => void;

this.DoSomeThingPrivate = () => {
...
}

图案。但也不行。

import express = require('express');

var app = express();

class Test {    
    constructor() {        
    }

    DoSomething(req:express.Request, res:express.Response, next:Function) :void {       
        this.DoSomeThingPrivate();
    }

    private DoSomeThingPrivate() :void
    {       
    }
}

var test = new Test();

app.use(test.DoSomething);

Relates to this

任何想法...

谢谢

Answer 1

以下应该可以正常工作，即使用粗箭头表示 DoSomething 而不是 DoSomethingPrivate:

import * as express from 'express';

var app = express();

class Test {    
    constructor() {        
    }

    // important: 
    DoSomething = (req:express.Request, res:express.Response, next:express.NextFunction) => {       
        this.DoSomeThingPrivate();
    }

    private DoSomeThingPrivate() :void
    {       
    }
}

var test = new Test();

app.use(test.DoSomething);

注意:您不需要使用bind。还有 https://www.youtube.com/watch?v=KDrWLMUY0R0&hd=1