javascript 使用 multer 上传文件时 req.files 未定义
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req.files is undefined when uploading file with multer
提问by arne.z
I am trying to build a Node.js Application in Express.js 4 that uploads an image. I decided to use the multermodule but cannot access the uploaded file through req.files.
Here Is the code I am using. I restricted it to those parts that I believe are relevant.
我正在尝试在 Express.js 4 中构建一个上传图像的 Node.js 应用程序。我决定使用该multer模块，但无法通过req.files. 这是我正在使用的代码。我将它限制在我认为相关的那些部分。
Jade code:
玉码：
form(method="POST", action="createPost", enctype="multipart/form-data")
input(type="file", name="photo")
br
input(type="submit" value="upload")
in routes/admin.js:
在路由/admin.js 中：
var express = require('express');
var multer = require('multer');
var router = express.Router();
var upload = multer({dest: './uploads/'});
router.post('/createPost', upload.single('photo'), function(req, res, next) {
console.log('files:', req.files);
console.log('body:', req.body);
// more code
}
output:
输出：
files: undefined
body: {}
The file is stored in the uploadsfolder but I cannot access its information in req.files. Can anyone help me?
该文件存储在uploads文件夹中，但我无法在req.files. 谁能帮我？
回答by jfriend00
When using upload.single(), per the multer documentation, the resulting file should be in req.file, not req.files. See the example in their doc here.
使用时upload.single()，每multer文档，生成的文件应该是req.file，没有req.files。请参阅此处的文档中的示例。
app.post('/profile', upload.single('avatar'), function (req, res, next) {
// req.file is the `avatar` file
// req.body will hold the text fields, if there were any
})
And, here's the actual doc for upload.single():
而且，这是实际的文档upload.single()：
.single(fieldname)
Accept a single file with the name fieldname. The single file will be stored in req.file.
.single（字段名）
接受名称为 fieldname 的单个文件。单个文件将存储在 req.file 中。
