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  <title>Sum of digits fixed example</title>
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  <h1>Sum of digits</h1>
  <pre id=out></pre>
  <script>!function(){var t=[];t.push("Input: 12345"),t.push("The sum of digits of 12345 is: "+function(t){var n=Math.abs(t);if(0===n)return 0;for(var o=n,u=0;0!==o;)u+=o%10,o=Math.floor(o/10);return u}(12345)),document.getElementById("out").textContent=t.join("\n")}()</script>
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JavaScript Sum of Digits — Fixed Number (Try It)