Hi all,

目前在前端上傳檔案時打算分段上傳, 前端程式碼參考這裡, 後端部分不曉得該如何結合到目前的code, 大致想法是分段取得, 再一起寫入檔案, 但let formData = req.body.fileUpload;會有錯誤, 請問資料型態該如何處理?

前端:

function FileChunky(file, chunkIndex){
    let chunkSize = 1024 * 4 ;
    let totalSize = file.size;
    let totalChunkSize = Math.floor((totalSize + chunkSize - 1) / chunkSize);
    if (chunkIndex >= totalChunkSize)
        return;
    
    let start = chunkIndex * chunkSize;
    let blob = file.slice(start, start + chunkSize);
    console.log(typeof(blob));

    var formData = new FormData();
    formData.append('MyFile', file);
    formData.append("fileUpload", blob);
    formData.append("chunkIndex", chunkIndex);
    formData.append("totalSize", totalSize);
    $.ajax({
        url: '/fileupload/upload',
        type: 'POST',
        data: formData,
        contentType: false,
        processData: false,
        success: function(data){
            console.log(data);
        },
        error: function(){
        }
    });
}

後端:

var express = require('express');
var router = express.Router();

var multer  = require('multer');

var storage = multer.diskStorage({
    destination: function (req, file, cb){
      cb(null, './uploads')
    },
    filename: function (req, file, cb){
      cb(null, Date.now() + file.originalname)
    }
});
var upload = multer({storage: storage});

router.post('/upload', upload.single('MyFile'), function (req, res, next) {
    var file = req.file;
    // combine file
    let formData = req.body.fileUpload;

    const str_success = '{"success": true, "data":{}}';
    var resobj = JSON.parse(str_success);        
    res.status(200).send(resobj);  
});