这两种使用快速中间件的方法之间有区别吗? [英] Is there a difference between these two methods of using express middleware?

问题描述

我遇到了两种不同的方式来定义express，use()中间件，并且想知道它们之间是否有任何区别，或者仅仅是语法糖?

I have come across two different ways to define express, use() middleware and am wondering if there is any difference between them or if it is simply syntax sugar?

const app = express();
app.use(cors());
app.use(responseTime());
app.use(someFunction);
app.use(anotherHandler);
app.use(failureHandler);

B

const app = express();
app.use(cors())
  .use(responseTime())
  .use(someFunction)
  .use(anotherHandler)
  .use(failureHandler);

推荐答案

它们不是使用它的两种方式.它们是相同的方式.通过调用 app.use().

They are not two ways of using it. They are the same way. By calling app.use().

它也不是语法糖. app.use()返回 this ，因此它返回的值(与 app 中存储的值相同)可用于链接另一个 .use()的调用，依此类推.
结果是一样的;选择哪种方式取决于您的口味(应该使用一种您认为更易于阅读和理解的方式).

And it is not syntactic sugar either. app.use() returns this, hence the value it returns (which is the same value stored in app) can be used to chain another call of .use() and so on.
The result is the same; it's a matter of taste which way you prefer (you should use the one that you feel it's easier to read and understand).

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