element-plus的文件上传组件el-upload

el-upload组件支持多种风格，如文件列表，图片，图片卡片，支持多种事件，预览，删除，上传成功，上传中等钩子。
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file-list：上传的文件集合，一定要用v-model:file-list进行双向绑定。
list-type:决定文件类型，filelist,picture,picture-card 3种

用法示例

vue代码

<script setup lang="ts">
import { onMounted, reactive, ref } from 'vue'
import type { FormInstance,FormRules,UploadUserFile  } from 'element-plus'

interface Good {
  
}

const goodForm=ref<Good>({
  
});



const fileList=ref<UploadUserFile[]>()

const picFileList=ref<UploadUserFile[]>()

const picCardFileList=ref<UploadUserFile[]>()

const previewDialogVisable=ref(false)
const previewPicUrl=ref()

const previewFunc = (uploadFile:UploadUserFile)=>{
    previewDialogVisable.value=true
    previewPicUrl.value=uploadFile.url
}

</script>

    
<template>
    <el-form :model="goodForm" status-icon label-position="left" label-width="auto" ref="formRef">
       

        <el-form-item label="select file">
          <el-upload v-model:file-list="fileList" action="http://localhost:3000/upload">
            <template #trigger>
                <el-button type="primary">select file</el-button>
            </template>
          </el-upload>
        </el-form-item>

        <el-form-item label="select pic file">
          <el-upload v-model:file-list="picFileList" list-type="picture" action="http://localhost:3000/upload">
            <template #trigger>
                <el-button type="primary">select file</el-button>
            </template>
          </el-upload>
        </el-form-item>

        <el-form-item label="picture card file">
          <el-upload v-model:file-list="picCardFileList" action="http://localhost:3000/upload" list-type="picture-card" :on-preview="previewFunc">
            <template #trigger>
                <el-button type="primary">select file</el-button>
            </template>
          </el-upload>
        </el-form-item>
        
        <el-dialog v-model="previewDialogVisable" >
            <img :src="previewPicUrl"  alt="preview image" w-full/>
        </el-dialog>

    </el-form>

      
</template>

<style scoped>
  
</style>

后端用node+ts

import express from 'express';
import multer from 'multer';
import path from 'path';
import cors from 'cors';

// 初始化 express 应用
const app = express();

app.use(cors())

// 设置文件存储配置
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, 'uploads/'); // 文件存储目录
  },
  filename: (req, file, cb) => {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    cb(null, file.fieldname + '-' + uniqueSuffix + path.extname(file.originalname)); // 文件名
  }
});

const upload = multer({ storage: storage });

// 创建文件上传路由
app.post('/upload', upload.single('file'), (req, res) => {
  res.send({
    message: 'File uploaded successfully',
    file: req.file
  });
});


app.use(express.static(path.join(__dirname, '../uploads')));

// 启动服务器
const PORT = 3000;
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});