使用 node.js 上传图像文件

通常，会在请求处理程序之外定义中间件，然后将其用作一个或多个请求处理程序的中间件。

const imgMulterMiddleware = multer({
    storage: multer.diskStorage({
        destination: (req, file, cb) => {
            cb(null, "./Uploads")
    },
    filename: (req, file, cb) => {

        cb(null, Date.now().toString() + '-' + file.originalname)

    },
    fileFilter: (req, file, cb) => {
        const extensionImg = ['image/png', 'image/jpg', 'image/jpeg'].find
        (formatPermitted => formatPermitted == file.mimetype)

        if(extensionImg){
            return cb(null, true)
        }
            return cb(null, false)
        } 

   })

}).single('image');

然后，根据需要使用该中间件：

routes.post('/uploads', imgMulterMiddleware, (req, res) => {
     // do something with req.file here which will be set
     // by the middleware if it was successful

    if (req.file) {
        res.json({erro: false, message: "ok"});
    } else {
        res.status(400).json({erro: true, message: "error"});
    }
});