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  <meta charset=utf-8>
  <title>Harshad — range</title>
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<body>
  <h1>Harshad numbers in [1, 20]</h1>
  <p><strong>Run</strong> to print the reference line.</p>
  <pre id=out></pre>
  <script>!function(){function n(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}var r=[];r.push("Harshad numbers in the range 1 to 20:");var t,o=[];for(t=1;t<=20;t++)n(t)&&o.push(String(t));r.push(o.join(" ")),document.getElementById("out").textContent=r.join("\n")}()</script>
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JavaScript Harshad — Range 1–20 (Try It)