首頁猿問 Express 中的中間件鏈接

Express 中的中間件鏈接

JavaScript

喵喔喔 2021-11-12 16:17:51

我正在編寫 API，想了解添加由多個路由共享的中間件的好方法是什么。中間件在每個路由中做同樣的事情，比如驗證主機/ip、驗證用戶等。 req 對象被加載到每個中間件中的其他對象，比如 req.host、req.ip、req.username 等。 app.post("/route1", middleware1, middleware2, middleware3, middleware4); app.post("/route2", middleware1, middleware2, middleware3, middleware4); const middleware1 = (req, res, next) => { // does something to validate user req.username = "username" next(); } const middleware2 = (req, res, next) => { // host validation req.host = "something modified in validation" next(); } const middleware3 = (req, res, next) => { // checks for mac and ip req.mac = "mac addr" next(); } const middleware4 = (req, res, next) => { res.send(); }或者像這樣： app.post("/route1", middleware1); app.post("/route2", middleware1); const middleware1 = (req, res) => { // does something to validate user req.username = "username" middleware2(req, res); } const middleware2 = (req, res) => { // host validation req.host = "something modified in validation" middleware3(req, res); } const middleware3 = (req, res) => { // checks for mac and ip req.mac = "mac addr" middleware4(req, res); } const middleware1 = (req, res) => { res.send(); }謝謝。

查看完整描述

3 回答

縹緲止盈

TA貢獻2041條經驗獲得超4個贊

通常我不會直接從另一個中間件調用中間件。它混合了中間件邏輯的職責和使用中間件的位置。

Express 的可配置性比您想象的要高得多。您還可以在公共路徑中安裝公共中間件：

如果所有路由都使用中間件：

// How common middlewares are normally installed:

app.post(middleware1);

app.post(middleware2);

app.post(middleware3);

app.post(middleware4);

// Alternative, less common way to do it:

app.post(middleware1,middleware2,middleware3,middleware4);

如果只有特定的 url模式使用中間件：

// Use a regexp:

app.post(/route(1|2)/, middleware1, middleware2, middleware3, middleware4);

// Or if you don't like regexp, use globs:

app.post('route*', middleware1, middleware2, middleware3, middleware4);

// Or a more specific glob pattern:

app.post('route1?2?', middleware1, middleware2, middleware3, middleware4);

如果子路徑中的所有 url 都使用中間件。例如，假設所有 url 都/route/...使用中間件：

const route = express.Router();

app.use('/route',route);

route.post(middleware1);

route.post(middleware2);

route.post(middleware3);

route.post(middleware4);

如果以上都不吸引你，你仍然可以使用你的第二個選項，但不是在彼此內部調用中間件，而是編寫一個中間件來初始化中間件：

function commonMiddlewares (req, res, next) {

middleware1(req,res,function() {

middleware2(req,res,function() {

middleware3(req,res,function() {

middleware4(req,res,next);

});

}

可以用較少嵌套的方式編寫：

function commonMiddlewares (req, res, next) {

function runMiddleware4 () {

middleware4(req,res,next);

}

function runMiddleware3 () {

middleware3(req,res,runMiddleware4);

}

function runMiddleware2 () {

middleware2(req,res,runMiddleware3);

}

middleware1(req,res,runMiddleware2);

}

反對回復 2021-11-12

回首憶惘然

TA貢獻1847條經驗獲得超11個贊

const express = require('express')

const { routesMiddleware } =require('./middlewares')

const { pureVaidationsFunctions1 } =require('./services')

const rout1 =express.Router()

const rout2 =express.Router()

const app = express()

app.use('/route1',route1)

app.use('/route2',route2)

// routesMiddleware a middleware to handle the execution of list of functions

// pureVaidationsFunctions1 list of funtions that `routesMiddleware` will consume

route1.post(routesMiddleware(pureVaidationsFunctions1))

route2.post(routesMiddleware(pureVaidationsFunctions2))

有道理？

反對回復 2021-11-12

蕭十郎

TA貢獻1815條經驗獲得超13個贊

您可以指定多個中間件，請參閱app.use 文檔：

以上任何一項的組合數組。

您可以創建所有中間件的文件，例如 -

中間件.js

module.exports = [

function(req, res, next){...},

]

然后簡單地添加它：

you can pass any of the below inside app.use()

A middleware function.

A series of middleware functions (separated by commas).

An array of middleware functions.

A combination of all of the above.

app.use(require('./middlewares.js'));

注意 - 僅對所有此類請求通用的中間件執行此操作。

反對回復 2021-11-12

3 回答
0 關注
188 瀏覽

關注

添加回答

舉報

0/150

提交

取消

亚洲在线久爱草,狠狠天天香蕉网,天天搞日日干久草,伊人亚洲日本欧美

熱搜

最近搜索清空

Express 中的中間件鏈接

Express 中的中間件鏈接

3 回答

添加回答