title: JSZip: Get content of file in zip from file input
body: <p>I want to get the content of a zip from input with JSZip.
  I can read the title of my file but how do I get the content</p>
  
  <p>I tried with jQuery:</p>
  
  <pre><code>$('.upload-input').on('change', function($event) {
   var $file = $event.target.files[0];
   JSZip.loadAsync($file).then(function($content) {
    alert($content.files["css/style.css"].async('text'));
   })
  });
  </code></pre>
  
  <p>return: [object Promise]</p>
  
  <p>What can I do to get the plain text</p>
  
  <p>JSFiddle: <a href="https://jsfiddle.net/jyuy7q6j/" rel="noreferrer">https://jsfiddle.net/jyuy7q6j/</a></p>
  
  <p>THX!</p>