如何在uniapp中实现图片上传和相册管理

uni.chooseImage({  count: 1,  success: res => {    const tempFilePaths = res.tempFilePaths    uni.uploadFile({      url: 'http://example.com/upload', // 上传图片的接口地址      filePath: tempFilePaths[0],      name: 'file',      success: res => {        console.log(res.data) // 上传成功后的返回数据      }    })  }})

// index.jsconst express = require('express')const multer = require('multer')const app = express()const upload = multer({ dest: 'uploads/' })app.post('/upload', upload.single('file'), (req, res) => {  // 处理上传的文件  console.log(req.file) // 上传的文件信息  res.send('Upload success')})app.listen(3000, () => {  console.log('Server started on port 3000')})

uni.chooseImage({  count: 9,  success: res => {    const tempFilePaths = res.tempFilePaths    console.log(tempFilePaths) // 选择的图片临时文件路径数组  }})

uni.previewImage({  urls: ['img1.jpg', 'img2.jpg'], // 图片地址数组  current: 'img1.jpg', // 当前显示的图片地址  success: res => {    console.log('预览图片成功')  }})uni.showActionSheet({  itemList: ['保存图片'],  success: res => {    if (res.tapIndex === 0) {      console.log('保存图片')    }  }})