title: highchart with numberformat (unit)
body: <p>I'm using <a href="http://www.highcharts.com/" rel="nofollow">Highcharts</a> to generate a line chart. </p>
  
  <p>And I'm having a problem with <code>numberFormat</code>:</p>
  
  <pre><code>var test = 15975000;
  numberFormat(test, 0,',','.');
  </code></pre>
  
  <p>the result is: <code>15.975.000</code></p>
  
  <p>But I want to transform <code>1000</code> to <code>1k</code>, <code>100000</code> to <code>100k</code>, <code>1000000</code> to <code>1m</code> like this.
  How can I deal with this problem?</p>