req.params 正在路由器文件中抛出"undefined"

Question

我正在做一个Node/Express的实践项目。

我的server.js是这样的:

const express = require("express")
const app = express()
const bodyParser = require("body-parser")
const morgan = require("morgan")
const { get } = require("http")
const PORT = 3000
const budgetRoute = require("./routes/Budget")
const envelopeRoute = require("./routes/Envelopes")
const envelopeNameRoute =require("./routes/Envelopes_name")
const envelopeTransferRoute =require("./routes/Envelopes_transfer")
global.envelopes = []
global.totalBudget = 0
app.use(bodyParser.json())
app.use(morgan("dev"))
app.use("/envelopes", envelopeRoute)
app.use("/envelopes/:name", envelopeNameRoute)
app.use("/envelopes/transfer/:name", envelopeTransferRoute)
app.use("/budget", budgetRoute)

app.listen(PORT, () =>{
console.log(`Listening on port ${PORT}`)
})

现在在我的路由文件routes/enveles_name我有这个:

router.put("/", (req,res,next)=>{
const envelopeToChangeName = req.params.name
const envelopeName = req.query.name
const envelopeBudget = req.query.budget
const reqEnvelope = envelopes.find(envelope => envelopeToChangeName)
if(envelopeBudget){
reqEnvelope.budget = envelopeBudget 
}
if(envelopeName){
reqEnvelope.name = envelopeName
}
res.status(201).send(reqEnvelope)
})

发送请求localhost:3000/envelopes/groceries?name=taxes后，应将信封名称从"groceries"taxes"帮助"。由于某些原因，req.params.name是"未定义的"。TypeError:无法设置未定义的属性(设置"name")"当我把它们都放在一个文件里，没有路由器的时候，它工作得很好。什么好主意吗?

Answer 1

我认为您需要添加{ mergeParams: true }以使参数可用，因为您使用另一个路由器文件，然后在哪里定义路由。

参见Express docs