通过monngoose保存图像但在mongodb中找不到它

Question

我通过monngoose保存图像但我在mongodb中找不到它？

我的代码

var express = require('express');
var fs = require('fs');
var app=express();
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var imgPath = '\Adpic.jpg';

mongoose.connect('mongodb://localhost:/27017/test');

var schema = new Schema({
    img: { data: Buffer, contentType: String }

});

    img: { data: Buffer, contentType: String }

});

var An = mongoose.model('An', schema);
app.post('/upload',function(req,res){    
    var asin = new An();
    asin.img.data = fs.readFileSync(imgPath);
    asin.img.contentType = 'image/jpg';

    asin.save(function (err, a) {
        if (err) throw err;

        console.error('saved img to mongo');
        res.json(a);
    });
});

app.listen(3000);