title: SCRIPT438: Object doesn't support property or method 'keys' in IE8
body: <p>I am getting error: <strong>SCRIPT438: Object doesn't support property or method 'keys'</strong> in <strong>IE8</strong> when trying to generate a pdf report using a library jspdf.debug.js.</p>
  
  <pre><code>File: jspdf.debug.js, Line: 362, Column: 4
  </code></pre>
  
  <p>On this line: <code>var fontKey = 'F' + (Object.keys(fonts).length + 1).toString(10),</code></p>
  
  <p>Everything is working fine in > IE 8 versions, But I got struck in IE8. </p>
  
  <p>Please help me to resolve my problem. Thanks.</p>