typescript 打字稿表达中间件
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Typescript express middleware
提问by Pintac
I have a simple auth middleware for express. It checks header and if all cool it calls next()
我有一个简单的快速认证中间件。它检查标题，如果一切都酷，它会调用 next()
Now when i am in "DoSomething" "this" is equal to global and not the instance of "Test" and "this.DoSomeThingPrivate" is undefined.
现在，当我在“DoSomething”中时，“this”等于全局而不是“Test”和“this.DoSomeThingPrivate”的实例未定义。
I have tried the
我已经尝试过
DoSomeThingPrivate :() => void;
this.DoSomeThingPrivate = () => {
...
}
pattern. But also does not work.
图案。但也不起作用。
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);
Any Ideas...
有任何想法吗...
thanks
谢谢
回答by basarat
The following should work fine i.e. use fat arrow for DoSomethingnot DoSomethingPrivate:
以下应该可以正常工作，即对DoSomethingnot使用胖箭头DoSomethingPrivate：
import express = require('express');
var app = express();
class Test {
constructor() {
}
// important:
DoSomething = (req:express.Request, res:express.Response, next:Function) => {
this.DoSomeThingPrivate();
}
private DoSomeThingPrivate() :void
{
}
}
var test = new Test();
app.use(test.DoSomething);
Note:You should not need to use bind. Also https://www.youtube.com/watch?v=KDrWLMUY0R0&hd=1
注意：您应该不需要使用bind. 还有https://www.youtube.com/watch?v=KDrWLMUY0R0&hd=1
回答by johngeorgewright
You've passed a reference just to the function itself. The function's instance will be global. You need to bind the function to the instance of test.
您只传递了对函数本身的引用。该函数的实例将是全局的。您需要将该函数绑定到 的实例test。
app.use(test.DoSomething.bind(test));
