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<!DOCTYPE html>
<html lang=en>
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  <meta charset=utf-8>
  <title>Harshad — single</title>
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<body>
  <h1>Harshad number check</h1>
  <p>Edit <code>num</code>, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){var n=function(n){var r=n;if(n<=0)return!1;var t=function(n){for(var r=0;n>0;)r+=n%10,n=Math.floor(n/10);return r}(n);return 0!==t&&r%t==0}(18)?"18 is a Harshad number.":"18 is not a Harshad number.";document.getElementById("out").textContent=n}()</script>
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JavaScript Harshad — Single check (Try It)