<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>文件上传</title><script type="text/javascript"> ?var input = document.querySelector(‘input‘); ?var img = document.querySelector(‘img‘); ?input.onchange = function () { ?//获取文件 ?var file = this.files[0]; ?//创建读取文件对象 ?var reader = new FileReader(); ?//读取文件 ?reader.readAsDataURL(file); ?//在回调函数中修改Img的src属性 ?reader.onload = function () { ?????console.log(reader.result); ?????img.src = reader.result; ?}}</script></head><body> ???<h3>文件上传：</h3> ???<img id="imghead" width=100% height=auto border=0 src=‘a1.png‘> ???<form action="/upload" method="post" enctype="multipart/form-data"> ???????<input type="file" name="imageFile" /> ???????<br /> ???????<input type="submit" value="上传文件" /> ???</form></body></html>下载代码
var fs = require(‘fs‘);var express = require(‘express‘);const bodyParser=require(‘body-parser‘);const multer=require(‘multer‘);var multerObj = multer({dest: ‘uploads/‘});const pathLib=require(‘path‘);var ??app= express();/*[ { fieldname: ‘imageFile‘, ???originalname: ‘u=685824479,2631081864&fm=27&gp=0.jpg‘, ???encoding: ‘7bit‘, ???mimetype: ‘image/jpeg‘, ???destination: ‘uploads/‘, ???filename: ‘d92bb2e42b0a18262e5b384b61ebffd2‘, ???path: ‘uploads\\d92bb2e42b0a18262e5b384b61ebffd2‘, ???size: 9907 } ]*/app.use(multerObj.any()); ?// 单域单文件上传：input[file]的 multiple != "multiple"app.post(‘/upload‘, function(req, res) { ?var ext=pathLib.parse(req.files[0].originalname).ext; ?var oldPath=req.files[0].path; ?var newPath=req.files[0].path+ext; ?var newFileName=req.files[0].filename+ext; ?fs.rename(oldPath, newPath, (err)=>{ ???if(err){ ?????res.status(500).send(‘files opration err‘).end(); ???} ???else{ ???res.redirect(‘/index‘); ???} ?});});app.get(‘/index‘, function (req, res) { ??res.sendFile( __dirname + "/" + "index.html" );});app.listen(8080);Node.js上传文件
原文地址：https://www.cnblogs.com/tianranhui/p/10801125.html