npm install -g @vue/cli
vue create vue-file-upload
cd vue-file-upload

<template>
  <div class="file-upload">
    <h2>頭像上傳</h2>
    <input type="file" @change="handleFileChange" />
    <button @click="uploadFile" :disabled="!selectedFile">上傳</button>
    <p v-if="uploadMessage" :class="{ success: isSuccess, error: !isSuccess }">{{ uploadMessage }}</p>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import axios from 'axios';

const selectedFile = ref(null);
const uploadMessage = ref('');
const isSuccess = ref(false);

const handleFileChange = (event) => {
  const file = event.target.files[0];
  if (file) {
    selectedFile.value = file;
    uploadMessage.value = ''; // 清除以前的消息
  }
};

const uploadFile = async () => {
  if (!selectedFile.value) return;

  const formData = new FormData();
  formData.append('file', selectedFile.value);

  try {
    const response = await axios.post('/api/upload', formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });

    if (response.data.url) {
      uploadMessage.value = '文件上傳成功！';
      isSuccess.value = true;
    } else {
      uploadMessage.value = '文件上傳失敗，請(qǐng)重試。';
      isSuccess.value = false;
    }
  } catch (error) {
    uploadMessage.value = '上傳過(guò)程中出現(xiàn)錯(cuò)誤，請(qǐng)稍后再試。';
    isSuccess.value = false;
  } finally {
    selectedFile.value = null; // 上傳完成后重置文件輸入
  }
};
</script>

<style scoped>
.file-upload {
  max-width: 400px;
  margin: auto;
  padding: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
}
.success {
  color: green;
}
.error {
  color: red;
}
</style>

npm install axios

import { createApp } from 'vue';
import App from './App.vue';
import axios from 'axios';

axios.defaults.baseURL = 'http://localhost:8080'; // 替換為后端API的基礎(chǔ)URL

createApp(App).mount('#app');

<template>
  <div id="app">
    <FileUpload />
  </div>
</template>

<script setup>
import FileUpload from './components/FileUpload.vue';
</script>

<style>
/* 添加你的全局樣式 */
</style>

npm run serve

npm init -y
npm install express multer cors

const express = require('express');
const multer = require('multer');
const cors = require('cors');
const path = require('path');

const app = express();
const upload = multer({ dest: 'uploads/' }); // 文件將被保存在uploads目錄

app.use(cors());

app.post('/api/upload', upload.single('file'), (req, res) => {
  if (!req.file) {
    return res.status(400).send({ error: '請(qǐng)上傳一個(gè)文件' });
  }
  
  // 返回文件信息
  const filePath = path.join(__dirname, 'uploads', req.file.filename);
  res.send({ url: filePath, filename: req.file.originalname });
});

const PORT = 8080;
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

node server.js