表达中间件被叫了两次

Question

我在app.js中的

const { authMiddleware } = require('./utils/authMiddleware')
var app = express();

app.use('/api', authMiddleware, require('./routes/upload-image'))
app.use('/api', require('./routes/user'))
app.use('/api', authMiddleware, require('./routes/task'))
app.use('/api', authMiddleware, require('./routes/credit'))

我有authMiddleware.js，它有一个简单的console.log

module.exports.authMiddleware = function(req, res, next) {
    //res.body.user_id = )
    console.log('get logged in user then set user id to body')
    next()
}

后映像端点就像这个routes / upload-image.js

const express = require('express');
const router = express.Router();

router.post('/upload-image', function(req, res) {
    res.json('ok')
});

router.get('/upload-image', function(req, res) { ... })

module.exports = router;

当我调用localhost：3000 / api / upload-image时，我在authMeiddleware中获得了两次控制台，为什么会触发两次？