html - How to run a JavaScript function on an input field when a button is pressed -

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i'm trying remember how associate html , js through different actions, wrote simple reverse script (any number turned string , reversed)

    <!doctype html> <html lang="en"> <head>     <meta charset="utf-8">     <title>title</title> </head> <body> <h1>number reverser</h1> <script>     function reverser(n){          n = n + "";         return n.split("").reverse().join("");     }  function executerev(){     console.log(reverser()); } </script> <input id="bubu"> <button onclick="executerev()">reverse 'em</button>  </body> </html>

the ridiculous part console returned

denifednu

my genius js level managed reverse error itself.

how can connect input function executed on button press , displayed in div (any div, not console)?

i'm not entirely sure mean think might talking using dom. instance, update div id="x", following. 

document.getelementbyid("x").innerhtml = "new content";

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