详解node+vue如何实现文件上传功能

const express = require('express');
const Router = express.Router();
const multer = require('multer');
const fs = require('fs');
const pathLib = require('path');
const videoModel = require('../../models/my_yx_app/video');


//设置 视频文件存放位置
const uploadVido = multer({
 dest:'uploads_yx_app/video/'
});
//上传视频
Router.post('/uploadVideo',uploadVido.single('file'),(req,res)=>{
 if (req.file) {
 let file = req.file;
 let newName = file.path+pathLib.parse(file.originalname).ext; //修改path
 fs.rename(file.path,newName,(err)=>{ //修改path
  if (err) {
  return res.status(200).json({
   code:0,
   msg:'服务器繁忙！'
  })
  }else {
  return res.status(200).json({
   code:1,
   msg:'上传完成',
   title:pathLib.parse(file.originalname).name,
   videoUrl:'http://127.0.0.1:3001/uploads_yx_app/video/'+file.filename+pathLib.parse(file.originalname).ext
  })
  }
 })
 }else {
 return res.status(200).json({
  code:0,
  msg:'服务器繁忙！'
 })
 }
});

<div class="from-contral" >

   <!--此处name 与 uploadVido.single('file') 相同-->
   <input type="file" name="file" @change="changeFile" class="customStyle">
   <el-button size="mini" type="primary">
   添加文件
   <i class="el-icon-upload el-icon--right"></i>
   </el-button>
   <div class="zt-title-video">{{ file.name }}</div>
   <div class="zt-progress" v-show="percentageShow">
   <el-progress
    :text-inside="true"
    :stroke-width="20"
    :percentage="percentage"
   >
  </el-progress>
 </div>
</div>

saveData() { //上传
  let that = this;
  let fd = new FormData();
  fd.append('file', this.file);
  fileUpdata({ //上传文件存储在后端
   method: 'post',
   url: '/uploadVideo',
   data: fd,
   //监听上传时间 //实现进度条
   onUploadProgress(progressEvent) {
   that.percentageShow = true;
   that.percentage = parseInt(((progressEvent.loaded / progressEvent.total) * 100));
   }
  }).then(res => {
   if (res.data.code === 1) {
   //数据持久化
   fileUpdata({
    method: 'post',
    url: '/saveVideoInfo',
    data: {
    videoUrl: res.data.videoUrl, //路径
    videoName: res.data.title, //标题
    videoType:that.videoType, //类型
    userName:localStorage.getItem('username') //那个用户上传的
    }
   }).then(res => {
    if (res.data.code === 1) {
    setTimeout(function () { //为什么延迟，为了使进度条走完
     that.$message({
     message: '上传成功',
     type: 'success'
     })
    }, 1000);
    }
   }).catch(err => {
    this.$message.error('服务器繁忙，请稍后重试！');
   });
   }
  }).catch(err => {
   this.$message.error('服务器繁忙，请稍后重试！');
  })
  },