// 這里我使用的是cropperjs插件，裁剪圖片成功執(zhí)行此方法
 crop(blob) {
   const formData = new FormData();
   let uid = this.$store.getters.getUid;
   formData.append("croppedImg", blob);
   formData.append("id", uid);
   // 這里使用的是Axios請求
   this.$http
     .post("upload", formData)
     .then(res => {
       let data = res.data;
       if (data.code == 1) {
         let uploadAvatar = this.$store.getters.getUploadAvatar;
         this.$store.dispatch("onSaveUploadAvatar", uploadAvatar + 1);
         this.$Modal.success({
           title: "提示",
           content: data.msg
         });
       } else {
         this.$Modal.warning({
           title: "提示",
           content: data.msg
         });
       }
     })
     .catch(error => {
       console.log(error);
     });
 }

// 這里我配置了router，直接用app.post沒有影響
router.post("/upload", (req, res) => {
  let obj = {};
  // 接收參數(shù)
  let form = new multiparty.Form();
  // 設置文件存儲路徑
  form.uploadDir = "./avatar";
  // 設置單文件大小設置
  form.maxFilesSize = 2 * 1024 * 1024;
  // 上傳完后處理
  form.parse(req, function (err, fields, files) {
    console.log(fields);
    console.log(files);
  }
 }

const formData = new FormData();
formData.append("basePath", "fos/attach/");
formData.append("file", e.file);

for (var [a, b] of formData.entries()) {
? console.log(a, b, '--------------');
}

formdata.get(key)