simple.js

// use jsx to render html, do not modify simple.html
var Dropzone = require('../lib/Dropzone');
require('../assets/index.css');
require('./simple.css');
var React = require('react');
function accept(file) {
  if (file.type.indexOf('image/') > -1) {
    return Promise.resolve();
  }
  return Promise.reject('只允许上传图片文件');
}

React.render(
    <Dropzone action="http://127.0.0.1:3000/"
    accept={accept}
    >
      <div className="dz-message">
        Drop files here or click to upload.<br/>
        <span className="note">(This is just a demo dropzone. Selected files are
          <strong>not</strong> actually uploaded.)</span>
      </div>
    </Dropzone>,
    document.getElementById('__react-content'));