在Node中使用formidable处理文件上传

具体使用方式参照官方文档：https://www.npmjs.com/package/formidable

第一：安装：

# npm install --save formidable
yarn add formidable

第二：基本使用：

var formidable = require(&＃39;formidable&＃39;),
    http = require(&＃39;http&＃39;),
    util = require(&＃39;util&＃39;);
 
http.createServer(function(req, res) {
  if (req.url == &＃39;/upload&＃39; && req.method.toLowerCase() == &＃39;post&＃39;) {
    // parse a file upload 
    var form = new formidable.IncomingForm();
 
    form.parse(req, function(err, fields, files) {
      res.writeHead(200, {&＃39;content-type&＃39;: &＃39;text/plain&＃39;});
      res.write(&＃39;received upload:

&＃39;);
      res.end(util.inspect({fields: fields, files: files}));
    });
 
    return;
  }
 
  // show a file upload form 
  res.writeHead(200, {&＃39;content-type&＃39;: &＃39;text/html&＃39;});
  res.end(
    &＃39;&＃39;+
    &＃39;
&＃39;+
    &＃39;
&＃39;+
    &＃39;&＃39;+
    &＃39;&＃39;
  );
}).listen(8080);