Egg.js 中 AJax 上传文件获取参数的方法

<fieldset style="margin: 20px; padding: 20px;"> <legend>单文件，Ajax</legend> <form id="form3">  <div>   <input type="text" id="customName" placeholder="自定义文件名" />  </div>  <div>   <input type="file" class="file" />  </div>  <div>   <input type="submit" value="上传">  </div> </form></fieldset><fieldset style="margin: 20px; padding: 20px;"> <legend>多文件，Ajax</legend> <form id="form4">  <div>   <input type="file" class="file" multiple />  </div>  <div>   <input type="submit" value="上传" />  </div> </form></fieldset><script> $(function () {  const _csrf = "{{ ctx.csrf | safe }}";  $('form').submit(function (e) {   e.preventDefault();   const formData = new FormData();   const fileList = $(this).find('.file')[0].files;   let index = 0;   for (let key of fileList) {    formData.append('file' + index, key);    index++   }   formData.append('isAjax', 'yes');   formData.append('customName', $(this).find('#customName').val() || '');   $.ajax({    url: '/admin/file/upload?_csrf=' + _csrf,    data: formData,    method: 'POST',    contentType: false,    processData: false,    success: function (result) {    },    error: function (responseStr) {     alert("error", responseStr);    }   });  }); });</script>

'use strict';const fs = require('fs');const path = require('path');const awaitWriteStream = require('await-stream-ready').write;const sendToWormhole = require('stream-wormhole');const formidable = require("formidable");const Controller = require('../../core/base_controller');class FileController extends Controller { async parse(req) {  const form = new formidable.IncomingForm();  return new Promise((resolve, reject) => {   form.parse(req, (err, fields, files) => {    resolve({ fields, files })   })  }); } /** * 上传文件，兼容单文件和多文件 * @param customName 单文件自定义文件名 * @param isAjax 上传方式 */ async upload() {  const { ctx, logger } = this;  const extraParams = await this.parse(ctx.req);  let { multipleFile, customName, isAjax } = extraParams && extraParams['fields'];  logger.info(multipleFile, customName, isAjax);  if (isAjax === 'yes') {   const urls = [];   for (let key in extraParams.files) {    const file = extraParams.files[key];    logger.info('file.name', file.name);    logger.info('customName', customName);    const stream = fs.createReadStream(file.path);    const fileName = customName ? (customName + path.extname(file.name)) : file.name;    const target = path.join(this.config.baseDir, 'app/public/upload', fileName);    const writeStream = fs.createWriteStream(target);    try {     await awaitWriteStream(stream.pipe(writeStream));    } catch (err) {     await sendToWormhole(stream);     throw err;    }    urls.push(target);   }   this.success({ urls })  } }}module.exports = FileController;