express router.post 时，res.body为undefined

Question

通过查询说是 res.body 为 undefined 时,是因为没有加载 body-parser ,但是我不存在这样的问题，却也返回 undefined ，是什么鬼啊？

//server.js 代码不完整，说明 body-parser 已经加载
const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.urlencoded({extended:false}))  
app.use(bodyParser.json());
app.use(passport.initialize());

const anvizApi = require('./router/api/anviz/home');

app.use('/api/anviz/home',anvizApi);

//router/api/anviz/home.js
//res.body 返回为 undefined
router.post('/banner',passportInfo,(req,res) => {

    const {msg,isValid} = homeBannerValidator(req.body);
    if(!isValid){
        return res.status(400).json(msg);
    }

    HomeSchema.findOne({banner:req.body._id}).then(banner => {
      console.log('current:   ' + res.body);

        //根据Model 数据模型组织数据
        const newBanner = {
            handle:req.body.handle,
            bannerBg:req.body.bannerBg,
            bannerName:req.body.bannerName,
            bannerSubName:req.body.bannerSubName,
            bannerFeather:req.body.bannerFeather,
            bannerLink:req.body.bannerLink
      };
      banner.prodcutBanner = newBanner;
      banner.then(banner => res.json(banner));
    })
    .catch((err) => res.json(err));
});

module.exports = router;

//Schema
const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const HomeSchema = new Schema({
    handle:{
        type:Boolean
    },
    prodcutBanner:{
        bannerBg:{
            type:String,
            required:true
        },
        bannerName:{
            type:String,
            required:true
        },
        bannerSubName:{
            type:String
        },
        bannerFeather:{
            type:String
        },
        bannerLink:{
            type:String
        }
    },
    prodcutList:[
        {
            prodctName:{
                type: String,
                required:true
            },
            prodctSubTitel:{
                type:String,
                required:true
            },
            prodctDes:{
                type:String,
                required:true
            },
            prodctLink:{
                type:String,
                required:true
            },
            prodctImg:{
                type:String,
                required:true
            },
            prodctFeature:[
                {
                    name:{
                        type:String
                    }
                }
            ]
        }
    ],
    prodctCase:[
        {
            caseImg:{
                type:String,
                required:true
            },
            caseTitle:{
                type:String,
                required:true
            },
            caseSubTitle:{
                type:String,
                required:true
            },
            caseLink:{
                type:String,
                required:true
            }
        }
    ]
});

module.exports = mongoose.model("home",HomeSchema);

我通过 postman 测试时，form 中的值是可以获取到的：

postman 中返回一个空对象！！！！！

求指点！谢谢！

Answer 1

你的bodyParser有加到use里面吗？

banner.prodcutBanner = newBanner;
      banner.then(banner => {
          console.log(banner);
          res.json(banner);
      });
      

打印一下