Node.js读取req.body的值为空？

默认情况下body得值为undefined，需使用express.json()或express.urlencoded()等正文解析中间件时填充。

var express = require('express')

var app = express()

app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded

app.post('/profile', function (req, res, next) {
  console.log(req.body)
  res.json(req.body)
})

参考express中文文档：req.body - Express 中文文档