teaching-uniapp/limits.md

const multer = require('koa-multer'); const fs = require('fs'); const path = require('path');

// 设置文件存储位置和上传大小限制 let storage = multer.diskStorage({ destination: function (req, file, cb) {

let date = new Date();
let year = date.getFullYear();
let month = date.getMonth() + 1;
let day = date.getDate();
let dir = "./public/uploads/" + year + month + day;

if (!fs.existsSync(dir)) {
  fs.mkdirSync(dir, {
    recursive: true,
  });
}
cb(null, dir);

}, filename: function (req, file, cb) {

let fileName =
  file.fieldname + "-" + Date.now() + path.extname(file.originalname);
cb(null, fileName);

}, });

const upload = multer({ storage: storage, limits: {

fileSize: 5 * 1024 * 1024, // 5MB的文件大小限制

}, });

// 上传图片接口 router.post("/img", upload.single("file"), async (ctx) => { let path = ctx.req.file.path; path = ctx.origin + "" + path.replace("public", ""); path = path.replace(/\/g, "/"); console.log(path);

ctx.body = path; });

// 错误处理程序 app.use((ctx, next) => { return next().catch((err) => {

if (err.name === "MulterError") {
  ctx.status = 400; // 设置响应状态码为400，表示请求错误
  ctx.body = "文件大小超过限制"; // 返回给客户端的提示信息
} else {
  throw err;
}

}); });

app.listen(3000, () => { console.log('Server is running on port 3000'); });