## 1.Html文件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
img {
width: 100px;
height: 100px;
}
.btn {
position: relative;
display: inline-block;
width: 75px;
height: 25px;
overflow: hidden;
line-height: 25px;
text-align: center;
vertical-align: middle;
background-color: #f90;
border: 1px solid #f90;
border-radius: 5px;
font-size: 14px;
color: #fff;
}
.btn:hover {
background-color: rgba(255, 153, 0, 0.822);
border: 1px solid rgba(255, 153, 0, 0.822);
}
.btn input {
position: absolute;
left: 0;
top: 0;
opacity: 0;
}
</style>
</head>
<body>
<img src="" alt="">
<div class="customUpload">
<label class="btn">
<span>选择图片</span>
<input type="file">
</label>
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.0/axios.min.js"></script>
<script>
const input = document.querySelector('input')
input.onchange = async function (e) {
const files = e.target.files[0]
const name = files.name
const res = await upload({ name, files })
const url = res.data.url
getImgUrl(url)
}
function upload({ name, files }) {
const formData = new FormData()
formData.append('name', name)
formData.append('file', files)
return axios({
method: 'POST',
url: 'http://localhost:3000/upload',
data: formData
})
}
function getImgUrl(src) {
const img = document.querySelector('img')
img.src = src
}
</script>
</body>
</html>
## 2. 服务端代码 server.js中
const express = require('express')
const cors = require('cors')
const multer = require('multer')
const uploadRouter = require('./routers')
const path = require('path')
const storage = multer.diskStorage({
// 输出的目录
destination (req, file, cb) {
cb(null, 'uploads/')
},
// 文件名重写,因为默认multer生成的文件是没有扩展名的
filename (req, file, cb) {
cb(null, Date.now() + file.originalname)
}
})
// 自定义控制
const upload = multer({ storage })
const app = express()
// 暴露静态资源
app.use(express.static(path.resolve(__dirname, './uploads')))
// 解决跨域
app.use(cors())
// 应用中间件
app.use(upload.any(), uploadRouter)
// 监听的端口
app.listen(3000, err => {
if (err) {
console.log(err)
return
}
console.log('success')
})
## 3. routers/index.js
const express = require('express')
const upload = require('./upload')
const router = express.Router()
router.post('/upload', upload)
module.exports = router
## 4. routers/upload.js
module.exports = function (req, res) {
const filename = req.files[0].filename
const url = 'http://localhost:3000/' + filename
res.send({
status: 200,
url
})
}
## 5. 新建一个uploads空目录即可