title: Increment Alphabet in JavaScript
body: <p>I want to show alphabet like this in Javascript;</p>
  
  <p>A,B,C,D....ZX,ZY,ZZ</p>
  
  <p>I tried like this;</p>
  
  <pre><code>var cols[A, B, C, D...Z];
  
  cols.join(',');
  
  for (var i = cols[0]; i &lt; cols.length; i++) {
      for(var j = cols[0]; j &lt; cols.length; j++) {
          var k = 'i' + 'j';
      }
  }
  
  document.write(&lt;span&gt; + cols.join + &lt;/span&gt;);
  </code></pre>
  
  <p>Could you tell me how to write source code?</p>