1. 安装multer：在终端中运行以下命令：

npm install --save multer

2. 在Node.js中设置Multer：

const multer = require('multer');

const storage = multer.diskStorage({ destination: (req, file, cb) => { cb(null, 'uploads/') }, filename: (req, file, cb) => { cb(null, file.originalname) } });

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

3. 在Node.js中使用Multer：

const express = require('express'); const app = express();

app.post('/api/upload', upload.single('file'), (req, res) => { if (!req.file) { console.log("No file is available!"); return res.send({ success: false }); } else { console.log('File is available!'); return res.send({ success: true }) } });

4. 在Angular中使用HttpClient和FormData对象上传文件：

onSubmit() { const formData = new FormData(); formData.append('file', this.selectedFile, this.selectedFile.name); this.http.post('/api/upload', formData).subscribe( res => { console.log(res); alert('SUCCESS !!'); }, err => { console.log(err); alert('ERROR !!'); } ); }

5. 在HTML中添加文件上传表单：