nodejs利用ajax实现网页无刷新上传图片实例代码

<div class="form-group">  <label>File input</label>  <input type="file" name="file" id="file">  <p id="result"></p>  <img id="img" src=""></div><button id="upload" class="btn btn-default">提交</button>

function uploadFile(){ var file = document.getElementById("file") var formData = new FormData(); formData.append('file',file.files[0]); $.ajax({  url: '/upload',  type: 'POST',  data: formData,  // async: false,  cache: false,  contentType: false,  processData: false,  success: function(data){   if(200 === data.code) {    $('#result').html("上传成功！");    $('#img').attr('src',data.data);   } else {    $('#result').html("上传失败！");   }   console.log('imgUploader upload success');  },  error: function(){   $("#result").html("与服务器通信发生错误");  } });}function postPage() {    var uploada = document.getElementById('upload');    uploada.addEventListener("click",function () {      uploadFile();    },false);}window.onload = function () {  postPage();}

var storage = multer.diskStorage({  destination: function (req, file, cb){    cb(null, './public/images')  },  filename: function (req, file, cb){    cb(null, file.originalname)  }});var upload = multer({  storage: storage});router.post('/upload', upload.single('file'), function (req, res, next) {  var url = 'http://' + req.headers.host + '/images/' + req.file.originalname  res.json({    code : 200,    data : url  })});

upload.single(‘file'), //适用于单文件上传。upload.array(‘file',num), //适用于多文件上传，num为最多上传个数，上传文件的数量可以小于num。